আমার একটি টেস্ট স্যুট আছে যা লোকালহোস্টে একটি সার্ভার আরম্ভ করে এবং তারপরে হাজার হাজার স্ট্রেস টেস্ট চালায় যা ক্লায়েন্টদের একই মেশিনে এই স্থানীয় সার্ভারের সাথে সংযোগ স্থাপন এবং বন্ধ করা অন্তর্ভুক্ত। আমি সার্ভারে ক্লায়েন্ট দ্বারা প্রেরিত আরএসটি-র কারণ অনুসন্ধান করার চেষ্টা করছি।
এটি ইভেন্টের ক্রম:
- ক্লায়েন্ট এসওয়াইএন আরম্ভ করে
- সার্ভার এসওয়াইএন, এসিকে ফেরত পাঠায়
- ক্লায়েন্ট আরএসটি প্রেরণ করে (ACK এর পরিবর্তে এবং সংযোগ স্থাপন করে)
একটি পর্যবেক্ষণ অনেক সময় হয় সার্ভারগুলি প্রায় 99 শতাংশ সিপিইউতে চলে যদিও এটি কয়েক সেকেন্ড / মিনিটে স্বাভাবিক অবস্থায় ফিরে আসে।
প্রাথমিকভাবে আমি ভেবেছিলাম এটি হ'ল কারণ ক্লায়েন্টটি পূর্বে বন্ধ হওয়া সংযোগ থেকে একটি পোর্ট ব্যবহার করছে যা TIME_WAIT অবস্থায় রয়েছে এবং তাই যখন সার্ভার কোনও SYN প্রেরণ করে তখন সেই সংযোগের ক্লায়েন্টটি আরএসটি জারি করে। যদিও ক্লায়েন্টকে TIME_WAIT রাজ্যে কোনও বন্দর ব্যবহার করা উচিত তা নিয়ে আমি সংশয়ী ছিলাম তবে তখন আমি পুরানো ফেডোরা কোর 4 ব্যবহার করছি এবং ভেবেছিলাম এটির টিসিপি / আইপি :-) সঠিকভাবে প্রয়োগ করা যায় না।
এখন আমি বিশ্বাস করি না যে কারণ এটি উপরের ইস্যুটি ঠিক করার চারপাশে করা সমস্ত টিউনিং সমস্যা হ্রাস করতে সহায়তা করে নি। এফওয়াইআই নিম্নলিখিত পরিবর্তনগুলি যা আমি চেষ্টা করেছি /etc/sysctl.conf:
net.ipv4.ip_local_port_range = 1024 65535
net.ipv4.tcp_fin_timeout = 15
net.ipv4.tcp_rfc1337 = 1
net.ipv4.tcp_tw_reuse = 1
আরও একটি বিষয়, এই সমস্যাটি সামঞ্জস্যপূর্ণ নয়। প্রকৃতপক্ষে আমি সার্ভারটি পুনরায় আরম্ভ করার এবং সমস্ত ক্লায়েন্ট পরীক্ষা চালানোর 15 থেকে 35 চক্রের মাধ্যমেই আমি এই সমস্যাটি পুনরুত্পাদন করতে পারি।
আমি কেন এমনটি ঘটতে পারে তা ভেবে ভাবতে পারি এমন সমস্ত কারণগুলির মধ্যে আমি দৌড়ে এসেছি যাতে কি ঘটতে পারে সে সম্পর্কে কারও ধারনা রয়েছে কিনা তা আমাকে জানান।
প্যাকেটের বিশদ
Date & Time No. Time Source Destination Protocol Length Source port Dest port Info
2014-06-25 14:49:45.378209 1032719 1858.494749 ::1 ::1 TCP 94 netview-aix-5 navisphere netview-aix-5 > navisphere [SYN] Seq=0 Win=32752 Len=0 MSS=16376 SACK_PERM=1 TSval=1587252 TSecr=0 WS=128
Frame 1032719: 94 bytes on wire (752 bits), 94 bytes captured (752 bits)
Arrival Time: Jun 25, 2014 14:49:45.378209000 EDT
Epoch Time: 1403722185.378209000 seconds
[Time delta from previous captured frame: 0.005893000 seconds]
[Time delta from previous displayed frame: 0.000000000 seconds]
[Time since reference or first frame: 1858.494749000 seconds]
Frame Number: 1032719
Frame Length: 94 bytes (752 bits)
Capture Length: 94 bytes (752 bits)
[Frame is marked: False]
[Frame is ignored: False]
[Protocols in frame: eth:ipv6:tcp]
[Coloring Rule Name: TCP SYN/FIN]
[Coloring Rule String: tcp.flags & 0x02 || tcp.flags.fin == 1]
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00)
Destination: 00:00:00_00:00:00 (00:00:00:00:00:00)
Address: 00:00:00_00:00:00 (00:00:00:00:00:00)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
Source: 00:00:00_00:00:00 (00:00:00:00:00:00)
Address: 00:00:00_00:00:00 (00:00:00:00:00:00)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
Type: IPv6 (0x86dd)
Internet Protocol Version 6, Src: ::1 (::1), Dst: ::1 (::1)
0110 .... = Version: 6
[0110 .... = This field makes the filter "ip.version == 6" possible: 6]
.... 0000 0000 .... .... .... .... .... = Traffic class: 0x00000000
.... 0000 00.. .... .... .... .... .... = Differentiated Services Field: Default (0x00000000)
.... .... ..0. .... .... .... .... .... = ECN-Capable Transport (ECT): Not set
.... .... ...0 .... .... .... .... .... = ECN-CE: Not set
.... .... .... 0000 0000 0000 0000 0000 = Flowlabel: 0x00000000
Payload length: 40
Next header: TCP (0x06)
Hop limit: 64
Source: ::1 (::1)
Destination: ::1 (::1)
Transmission Control Protocol, Src Port: netview-aix-5 (1665), Dst Port: navisphere (2162), Seq: 0, Len: 0
Source port: netview-aix-5 (1665)
Destination port: navisphere (2162)
[Stream index: 3374]
Sequence number: 0 (relative sequence number)
Header length: 40 bytes
Flags: 0x02 (SYN)
000. .... .... = Reserved: Not set
...0 .... .... = Nonce: Not set
.... 0... .... = Congestion Window Reduced (CWR): Not set
.... .0.. .... = ECN-Echo: Not set
.... ..0. .... = Urgent: Not set
.... ...0 .... = Acknowledgement: Not set
.... .... 0... = Push: Not set
.... .... .0.. = Reset: Not set
.... .... ..1. = Syn: Set
[Expert Info (Chat/Sequence): Connection establish request (SYN): server port navisphere]
.... .... ...0 = Fin: Not set
Window size value: 32752
[Calculated window size: 32752]
Checksum: 0xf489 [validation disabled]
[Good Checksum: False]
[Bad Checksum: False]
Options: (20 bytes)
Maximum segment size: 16376 bytes
TCP SACK Permitted Option: True
Timestamps: TSval 1587252, TSecr 0
No-Operation (NOP)
Window scale: 7 (multiply by 128)
Date & Time No. Time Source Destination Protocol Length Source port Dest port Info
2014-06-25 14:49:45.378222 1032720 1858.494762 ::1 ::1 TCP 94 navisphere netview-aix-5 navisphere > netview-aix-5 [SYN, ACK] Seq=0 Ack=1 Win=32728 Len=0 MSS=16376 SACK_PERM=1 TSval=1587252 TSecr=1587252 WS=128
Frame 1032720: 94 bytes on wire (752 bits), 94 bytes captured (752 bits)
Arrival Time: Jun 25, 2014 14:49:45.378222000 EDT
Epoch Time: 1403722185.378222000 seconds
[Time delta from previous captured frame: 0.000013000 seconds]
[Time delta from previous displayed frame: 0.000013000 seconds]
[Time since reference or first frame: 1858.494762000 seconds]
Frame Number: 1032720
Frame Length: 94 bytes (752 bits)
Capture Length: 94 bytes (752 bits)
[Frame is marked: False]
[Frame is ignored: False]
[Protocols in frame: eth:ipv6:tcp]
[Coloring Rule Name: TCP SYN/FIN]
[Coloring Rule String: tcp.flags & 0x02 || tcp.flags.fin == 1]
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00)
Destination: 00:00:00_00:00:00 (00:00:00:00:00:00)
Address: 00:00:00_00:00:00 (00:00:00:00:00:00)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
Source: 00:00:00_00:00:00 (00:00:00:00:00:00)
Address: 00:00:00_00:00:00 (00:00:00:00:00:00)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
Type: IPv6 (0x86dd)
Internet Protocol Version 6, Src: ::1 (::1), Dst: ::1 (::1)
0110 .... = Version: 6
[0110 .... = This field makes the filter "ip.version == 6" possible: 6]
.... 0000 0000 .... .... .... .... .... = Traffic class: 0x00000000
.... 0000 00.. .... .... .... .... .... = Differentiated Services Field: Default (0x00000000)
.... .... ..0. .... .... .... .... .... = ECN-Capable Transport (ECT): Not set
.... .... ...0 .... .... .... .... .... = ECN-CE: Not set
.... .... .... 0000 0000 0000 0000 0000 = Flowlabel: 0x00000000
Payload length: 40
Next header: TCP (0x06)
Hop limit: 64
Source: ::1 (::1)
Destination: ::1 (::1)
Transmission Control Protocol, Src Port: navisphere (2162), Dst Port: netview-aix-5 (1665), Seq: 0, Ack: 1, Len: 0
Source port: navisphere (2162)
Destination port: netview-aix-5 (1665)
[Stream index: 3374]
Sequence number: 0 (relative sequence number)
Acknowledgement number: 1 (relative ack number)
Header length: 40 bytes
Flags: 0x12 (SYN, ACK)
000. .... .... = Reserved: Not set
...0 .... .... = Nonce: Not set
.... 0... .... = Congestion Window Reduced (CWR): Not set
.... .0.. .... = ECN-Echo: Not set
.... ..0. .... = Urgent: Not set
.... ...1 .... = Acknowledgement: Set
.... .... 0... = Push: Not set
.... .... .0.. = Reset: Not set
.... .... ..1. = Syn: Set
[Expert Info (Chat/Sequence): Connection establish acknowledge (SYN+ACK): server port navisphere]
.... .... ...0 = Fin: Not set
Window size value: 32728
[Calculated window size: 32728]
Checksum: 0xf7fa [validation disabled]
[Good Checksum: False]
[Bad Checksum: False]
Options: (20 bytes)
Maximum segment size: 16376 bytes
TCP SACK Permitted Option: True
Timestamps: TSval 1587252, TSecr 1587252
No-Operation (NOP)
Window scale: 7 (multiply by 128)
[SEQ/ACK analysis]
[This is an ACK to the segment in frame: 1032719]
[The RTT to ACK the segment was: 0.000013000 seconds]
Date & Time No. Time Source Destination Protocol Length Source port Dest port Info
2014-06-25 14:49:45.378228 1032721 1858.494768 ::1 ::1 TCP 74 netview-aix-5 navisphere netview-aix-5 > navisphere [RST] Seq=1 Win=0 Len=0
Frame 1032721: 74 bytes on wire (592 bits), 74 bytes captured (592 bits)
Arrival Time: Jun 25, 2014 14:49:45.378228000 EDT
Epoch Time: 1403722185.378228000 seconds
[Time delta from previous captured frame: 0.000006000 seconds]
[Time delta from previous displayed frame: 0.000006000 seconds]
[Time since reference or first frame: 1858.494768000 seconds]
Frame Number: 1032721
Frame Length: 74 bytes (592 bits)
Capture Length: 74 bytes (592 bits)
[Frame is marked: False]
[Frame is ignored: False]
[Protocols in frame: eth:ipv6:tcp]
[Coloring Rule Name: TCP RST]
[Coloring Rule String: tcp.flags.reset eq 1]
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00)
Destination: 00:00:00_00:00:00 (00:00:00:00:00:00)
Address: 00:00:00_00:00:00 (00:00:00:00:00:00)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
Source: 00:00:00_00:00:00 (00:00:00:00:00:00)
Address: 00:00:00_00:00:00 (00:00:00:00:00:00)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
Type: IPv6 (0x86dd)
Internet Protocol Version 6, Src: ::1 (::1), Dst: ::1 (::1)
0110 .... = Version: 6
[0110 .... = This field makes the filter "ip.version == 6" possible: 6]
.... 0000 0000 .... .... .... .... .... = Traffic class: 0x00000000
.... 0000 00.. .... .... .... .... .... = Differentiated Services Field: Default (0x00000000)
.... .... ..0. .... .... .... .... .... = ECN-Capable Transport (ECT): Not set
.... .... ...0 .... .... .... .... .... = ECN-CE: Not set
.... .... .... 0000 0000 0000 0000 0000 = Flowlabel: 0x00000000
Payload length: 20
Next header: TCP (0x06)
Hop limit: 64
Source: ::1 (::1)
Destination: ::1 (::1)
Transmission Control Protocol, Src Port: netview-aix-5 (1665), Dst Port: navisphere (2162), Seq: 1, Len: 0
Source port: netview-aix-5 (1665)
Destination port: navisphere (2162)
[Stream index: 3374]
Sequence number: 1 (relative sequence number)
Header length: 20 bytes
Flags: 0x04 (RST)
000. .... .... = Reserved: Not set
...0 .... .... = Nonce: Not set
.... 0... .... = Congestion Window Reduced (CWR): Not set
.... .0.. .... = ECN-Echo: Not set
.... ..0. .... = Urgent: Not set
.... ...0 .... = Acknowledgement: Not set
.... .... 0... = Push: Not set
.... .... .1.. = Reset: Set
[Expert Info (Chat/Sequence): Connection reset (RST)]
.... .... ..0. = Syn: Not set
.... .... ...0 = Fin: Not set
Window size value: 0
[Calculated window size: 0]
[Window size scaling factor: 128]
Checksum: 0x4eea [validation disabled]
[Good Checksum: False]
[Bad Checksum: False]
Date & Time No. Time Source Destination Protocol Length Source port Dest port Info
2014-06-25 14:49:48.375927 1032722 1861.492467 ::1 ::1 TCP 94 netview-aix-5 navisphere netview-aix-5 > navisphere [SYN] Seq=0 Win=32752 Len=0 MSS=16376 SACK_PERM=1 TSval=1588002 TSecr=0 WS=128
Frame 1032722: 94 bytes on wire (752 bits), 94 bytes captured (752 bits)
Arrival Time: Jun 25, 2014 14:49:48.375927000 EDT
Epoch Time: 1403722188.375927000 seconds
[Time delta from previous captured frame: 2.997699000 seconds]
[Time delta from previous displayed frame: 2.997699000 seconds]
[Time since reference or first frame: 1861.492467000 seconds]
Frame Number: 1032722
Frame Length: 94 bytes (752 bits)
Capture Length: 94 bytes (752 bits)
[Frame is marked: False]
[Frame is ignored: False]
[Protocols in frame: eth:ipv6:tcp]
[Coloring Rule Name: TCP SYN/FIN]
[Coloring Rule String: tcp.flags & 0x02 || tcp.flags.fin == 1]
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00)
Destination: 00:00:00_00:00:00 (00:00:00:00:00:00)
Address: 00:00:00_00:00:00 (00:00:00:00:00:00)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
Source: 00:00:00_00:00:00 (00:00:00:00:00:00)
Address: 00:00:00_00:00:00 (00:00:00:00:00:00)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
Type: IPv6 (0x86dd)
Internet Protocol Version 6, Src: ::1 (::1), Dst: ::1 (::1)
0110 .... = Version: 6
[0110 .... = This field makes the filter "ip.version == 6" possible: 6]
.... 0000 0000 .... .... .... .... .... = Traffic class: 0x00000000
.... 0000 00.. .... .... .... .... .... = Differentiated Services Field: Default (0x00000000)
.... .... ..0. .... .... .... .... .... = ECN-Capable Transport (ECT): Not set
.... .... ...0 .... .... .... .... .... = ECN-CE: Not set
.... .... .... 0000 0000 0000 0000 0000 = Flowlabel: 0x00000000
Payload length: 40
Next header: TCP (0x06)
Hop limit: 64
Source: ::1 (::1)
Destination: ::1 (::1)
Transmission Control Protocol, Src Port: netview-aix-5 (1665), Dst Port: navisphere (2162), Seq: 0, Len: 0
Source port: netview-aix-5 (1665)
Destination port: navisphere (2162)
[Stream index: 3374]
Sequence number: 0 (relative sequence number)
Header length: 40 bytes
Flags: 0x02 (SYN)
000. .... .... = Reserved: Not set
...0 .... .... = Nonce: Not set
.... 0... .... = Congestion Window Reduced (CWR): Not set
.... .0.. .... = ECN-Echo: Not set
.... ..0. .... = Urgent: Not set
.... ...0 .... = Acknowledgement: Not set
.... .... 0... = Push: Not set
.... .... .0.. = Reset: Not set
.... .... ..1. = Syn: Set
[Expert Info (Chat/Sequence): Connection establish request (SYN): server port navisphere]
.... .... ...0 = Fin: Not set
Window size value: 32752
[Calculated window size: 32752]
Checksum: 0xf19b [validation disabled]
[Good Checksum: False]
[Bad Checksum: False]
Options: (20 bytes)
Maximum segment size: 16376 bytes
TCP SACK Permitted Option: True
Timestamps: TSval 1588002, TSecr 0
No-Operation (NOP)
Window scale: 7 (multiply by 128)
Date & Time No. Time Source Destination Protocol Length Source port Dest port Info
2014-06-25 14:49:48.375950 1032723 1861.492490 ::1 ::1 TCP 94 navisphere netview-aix-5 [TCP Previous segment lost] navisphere > netview-aix-5 [SYN, ACK] Seq=2997725 Ack=1 Win=32728 Len=0 MSS=16376 SACK_PERM=1 TSval=1588002 TSecr=1588002 WS=128
Frame 1032723: 94 bytes on wire (752 bits), 94 bytes captured (752 bits)
Arrival Time: Jun 25, 2014 14:49:48.375950000 EDT
Epoch Time: 1403722188.375950000 seconds
[Time delta from previous captured frame: 0.000023000 seconds]
[Time delta from previous displayed frame: 0.000023000 seconds]
[Time since reference or first frame: 1861.492490000 seconds]
Frame Number: 1032723
Frame Length: 94 bytes (752 bits)
Capture Length: 94 bytes (752 bits)
[Frame is marked: False]
[Frame is ignored: False]
[Protocols in frame: eth:ipv6:tcp]
[Coloring Rule Name: Bad TCP]
[Coloring Rule String: tcp.analysis.flags]
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00)
Destination: 00:00:00_00:00:00 (00:00:00:00:00:00)
Address: 00:00:00_00:00:00 (00:00:00:00:00:00)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
Source: 00:00:00_00:00:00 (00:00:00:00:00:00)
Address: 00:00:00_00:00:00 (00:00:00:00:00:00)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
Type: IPv6 (0x86dd)
Internet Protocol Version 6, Src: ::1 (::1), Dst: ::1 (::1)
0110 .... = Version: 6
[0110 .... = This field makes the filter "ip.version == 6" possible: 6]
.... 0000 0000 .... .... .... .... .... = Traffic class: 0x00000000
.... 0000 00.. .... .... .... .... .... = Differentiated Services Field: Default (0x00000000)
.... .... ..0. .... .... .... .... .... = ECN-Capable Transport (ECT): Not set
.... .... ...0 .... .... .... .... .... = ECN-CE: Not set
.... .... .... 0000 0000 0000 0000 0000 = Flowlabel: 0x00000000
Payload length: 40
Next header: TCP (0x06)
Hop limit: 64
Source: ::1 (::1)
Destination: ::1 (::1)
Transmission Control Protocol, Src Port: navisphere (2162), Dst Port: netview-aix-5 (1665), Seq: 2997725, Ack: 1, Len: 0
Source port: navisphere (2162)
Destination port: netview-aix-5 (1665)
[Stream index: 3374]
Sequence number: 2997725 (relative sequence number)
Acknowledgement number: 1 (relative ack number)
Header length: 40 bytes
Flags: 0x12 (SYN, ACK)
000. .... .... = Reserved: Not set
...0 .... .... = Nonce: Not set
.... 0... .... = Congestion Window Reduced (CWR): Not set
.... .0.. .... = ECN-Echo: Not set
.... ..0. .... = Urgent: Not set
.... ...1 .... = Acknowledgement: Set
.... .... 0... = Push: Not set
.... .... .0.. = Reset: Not set
.... .... ..1. = Syn: Set
[Expert Info (Chat/Sequence): Connection establish acknowledge (SYN+ACK): server port navisphere]
.... .... ...0 = Fin: Not set
Window size value: 32728
[Calculated window size: 32728]
Checksum: 0x3414 [validation disabled]
[Good Checksum: False]
[Bad Checksum: False]
Options: (20 bytes)
Maximum segment size: 16376 bytes
TCP SACK Permitted Option: True
Timestamps: TSval 1588002, TSecr 1588002
No-Operation (NOP)
Window scale: 7 (multiply by 128)
[SEQ/ACK analysis]
[This is an ACK to the segment in frame: 1032722]
[The RTT to ACK the segment was: 0.000023000 seconds]
[TCP Analysis Flags]
[A segment before this frame was lost]
[Expert Info (Warn/Sequence): Previous segment lost (common at capture start)]
Date & Time No. Time Source Destination Protocol Length Source port Dest port Info
2014-06-25 14:49:48.375958 1032724 1861.492498 ::1 ::1 TCP 74 netview-aix-5 navisphere netview-aix-5 > navisphere [RST] Seq=1 Win=0 Len=0
Frame 1032724: 74 bytes on wire (592 bits), 74 bytes captured (592 bits)
Arrival Time: Jun 25, 2014 14:49:48.375958000 EDT
Epoch Time: 1403722188.375958000 seconds
[Time delta from previous captured frame: 0.000008000 seconds]
[Time delta from previous displayed frame: 0.000008000 seconds]
[Time since reference or first frame: 1861.492498000 seconds]
Frame Number: 1032724
Frame Length: 74 bytes (592 bits)
Capture Length: 74 bytes (592 bits)
[Frame is marked: False]
[Frame is ignored: False]
[Protocols in frame: eth:ipv6:tcp]
[Coloring Rule Name: TCP RST]
[Coloring Rule String: tcp.flags.reset eq 1]
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00)
Destination: 00:00:00_00:00:00 (00:00:00:00:00:00)
Address: 00:00:00_00:00:00 (00:00:00:00:00:00)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
Source: 00:00:00_00:00:00 (00:00:00:00:00:00)
Address: 00:00:00_00:00:00 (00:00:00:00:00:00)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
Type: IPv6 (0x86dd)
Internet Protocol Version 6, Src: ::1 (::1), Dst: ::1 (::1)
0110 .... = Version: 6
[0110 .... = This field makes the filter "ip.version == 6" possible: 6]
.... 0000 0000 .... .... .... .... .... = Traffic class: 0x00000000
.... 0000 00.. .... .... .... .... .... = Differentiated Services Field: Default (0x00000000)
.... .... ..0. .... .... .... .... .... = ECN-Capable Transport (ECT): Not set
.... .... ...0 .... .... .... .... .... = ECN-CE: Not set
.... .... .... 0000 0000 0000 0000 0000 = Flowlabel: 0x00000000
Payload length: 20
Next header: TCP (0x06)
Hop limit: 64
Source: ::1 (::1)
Destination: ::1 (::1)
Transmission Control Protocol, Src Port: netview-aix-5 (1665), Dst Port: navisphere (2162), Seq: 1, Len: 0
Source port: netview-aix-5 (1665)
Destination port: navisphere (2162)
[Stream index: 3374]
Sequence number: 1 (relative sequence number)
Header length: 20 bytes
Flags: 0x04 (RST)
000. .... .... = Reserved: Not set
...0 .... .... = Nonce: Not set
.... 0... .... = Congestion Window Reduced (CWR): Not set
.... .0.. .... = ECN-Echo: Not set
.... ..0. .... = Urgent: Not set
.... ...0 .... = Acknowledgement: Not set
.... .... 0... = Push: Not set
.... .... .1.. = Reset: Set
[Expert Info (Chat/Sequence): Connection reset (RST)]
.... .... ..0. = Syn: Not set
.... .... ...0 = Fin: Not set
Window size value: 0
[Calculated window size: 0]
[Window size scaling factor: 128]
Checksum: 0x4eea [validation disabled]
[Good Checksum: False]
[Bad Checksum: False]
Date & Time No. Time Source Destination Protocol Length Source port Dest port Info
2014-06-25 14:49:54.376072 1032725 1867.492612 ::1 ::1 TCP 94 netview-aix-5 navisphere netview-aix-5 > navisphere [SYN] Seq=0 Win=32752 Len=0 MSS=16376 SACK_PERM=1 TSval=1589502 TSecr=0 WS=128
Frame 1032725: 94 bytes on wire (752 bits), 94 bytes captured (752 bits)
Arrival Time: Jun 25, 2014 14:49:54.376072000 EDT
Epoch Time: 1403722194.376072000 seconds
[Time delta from previous captured frame: 6.000114000 seconds]
[Time delta from previous displayed frame: 6.000114000 seconds]
[Time since reference or first frame: 1867.492612000 seconds]
Frame Number: 1032725
Frame Length: 94 bytes (752 bits)
Capture Length: 94 bytes (752 bits)
[Frame is marked: False]
[Frame is ignored: False]
[Protocols in frame: eth:ipv6:tcp]
[Coloring Rule Name: TCP SYN/FIN]
[Coloring Rule String: tcp.flags & 0x02 || tcp.flags.fin == 1]
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00)
Destination: 00:00:00_00:00:00 (00:00:00:00:00:00)
Address: 00:00:00_00:00:00 (00:00:00:00:00:00)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
Source: 00:00:00_00:00:00 (00:00:00:00:00:00)
Address: 00:00:00_00:00:00 (00:00:00:00:00:00)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
Type: IPv6 (0x86dd)
Internet Protocol Version 6, Src: ::1 (::1), Dst: ::1 (::1)
0110 .... = Version: 6
[0110 .... = This field makes the filter "ip.version == 6" possible: 6]
.... 0000 0000 .... .... .... .... .... = Traffic class: 0x00000000
.... 0000 00.. .... .... .... .... .... = Differentiated Services Field: Default (0x00000000)
.... .... ..0. .... .... .... .... .... = ECN-Capable Transport (ECT): Not set
.... .... ...0 .... .... .... .... .... = ECN-CE: Not set
.... .... .... 0000 0000 0000 0000 0000 = Flowlabel: 0x00000000
Payload length: 40
Next header: TCP (0x06)
Hop limit: 64
Source: ::1 (::1)
Destination: ::1 (::1)
Transmission Control Protocol, Src Port: netview-aix-5 (1665), Dst Port: navisphere (2162), Seq: 0, Len: 0
Source port: netview-aix-5 (1665)
Destination port: navisphere (2162)
[Stream index: 3374]
Sequence number: 0 (relative sequence number)
Header length: 40 bytes
Flags: 0x02 (SYN)
000. .... .... = Reserved: Not set
...0 .... .... = Nonce: Not set
.... 0... .... = Congestion Window Reduced (CWR): Not set
.... .0.. .... = ECN-Echo: Not set
.... ..0. .... = Urgent: Not set
.... ...0 .... = Acknowledgement: Not set
.... .... 0... = Push: Not set
.... .... .0.. = Reset: Not set
.... .... ..1. = Syn: Set
[Expert Info (Chat/Sequence): Connection establish request (SYN): server port navisphere]
.... .... ...0 = Fin: Not set
Window size value: 32752
[Calculated window size: 32752]
Checksum: 0xebbf [validation disabled]
[Good Checksum: False]
[Bad Checksum: False]
Options: (20 bytes)
Maximum segment size: 16376 bytes
TCP SACK Permitted Option: True
Timestamps: TSval 1589502, TSecr 0
No-Operation (NOP)
Window scale: 7 (multiply by 128)
iptables-save আউটপুট:
# Generated by iptables-save v1.3.0 on Thu Jun 26 10:15:33 2014
*filter
:FORWARD ACCEPT [0:0]
:INPUT ACCEPT [675:236200]
:OUTPUT ACCEPT [241:21540]
COMMIT
# Completed on Thu Jun 26 10:15:33 2014
ক্লায়েন্টের সকেটটি কি নন-ব্লকিং মোডে রয়েছে? সার্ভারটি গ্রহণ করার পরে ক্লায়েন্ট সকেটটি বন্ধ হয়ে যাওয়া কি সম্ভব? এই প্যাকেটগুলির জন্য আপনার কি সময় আছে? একটি পিসিপি সম্ভবত?
—
স্টাফেন চেজেলাস
আপনি কি এর রিটার্ন ভ্যালু চেক করেন
—
স্টাফেন চেজেলাস
connect()s? আপনি কি connect()sএকই সকেটে দুটি নন-ব্লক করা সম্ভব ? এটি কি সম্ভব যে কোনও ক্লায়েন্ট মারা যেতে বা কোনওভাবে ( alarm()?) এর মাঝখানে বাধা পেয়ে connect()? আপনি কি ক্লায়েন্টের অধীনে strace -ffবা এর সাথে চলছে তা পুনরুত্পাদন করতে পারেন autrace?
আউটপুটে অভিনব কিছু (nfqueue, সংযোগ সীমাবদ্ধ ...)
—
স্টাফেন চেজেলাস
iptables-save? সম্ভাবনা যে কিছু সংস্থান সীমা পৌঁছেছেন? একসাথে কতগুলি গ্রাহক? ঐ কি bindনির্দিষ্ট সূত্রের বন্দর কিভাবে?
প্রশ্নে আরও যুক্ত করা হবে। আপনার পরীক্ষায় সেই সীমাগুলি পৌঁছেছে (বা সম্ভবত পৌঁছেছে) সেগুলি আসলে কি তার চেয়ে আরও বেশি প্রশ্ন।
—
স্টাফেন চেজেলাস
আমার অনুমান যে স্ট্যাকের উপর চাপ দেওয়া অর্ধেক খোলা অবস্থায় সময়সীমা ক্লায়েন্টের সাথে একটি সংযোগ পড়ে। সেই সংযোগটি বাদ দেওয়া হয়েছে (যার অর্থ ক্লায়েন্ট অ্যাপ্লিকেশনটিকে এ হিসাবে দেখা উচিত
—
didierc
ETIMEDOUT) এবং যখন সিএন / এস্কটি শেষ পর্যন্ত স্ট্যাকের মাধ্যমে প্রক্রিয়া করা হয়, তখন এটির সাথে সম্পর্কিত হওয়ার জন্য আর কোনও সংযোগ নেই, এবং এটি পুনরায় সেট হয়ে যায়। আপনি কি সিন সিন ব্যাকলগ ( sysctl -w net.ipv4.tcp_max_syn_backlog=???) এর আকার বাড়ানোর চেষ্টা করেছেন ?