Wireshark Developer and User Conference
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1 Wireshark Developer and User Conference Packet Trace Whispering June 14 th, 2011 Hansang Bae Senior VP Ci5 (f.k.a. Ci5group) SHARKFEST 11 Stanford University June 13-16, 2011
2 Wireshark Developer and User Conference Packet Trace Whispering June 14 th, 2011 The video/audio recording made during the session will be made available on YouTube and by the end of June. On Youtube, just search for hansangb wireshark
3 Selec5ve Packet Loss? AXer turning up a new interna5onal circuit, applica5on developers cannot connect to the server. It s not the network! Or is it? Easy to dismiss as packet loss at first glance. Use IP.ID to find addi5onal clues. TCP guarantees delivery. What does that mean? Learn to pick up on key differences Learn to ignore the background chaaer.
4 Selec5ve Packet Loss (con t)? cxi #ping Protocol [ip]: Target IP address: Repeat count [5]: Datagram size [100]: Timeout in seconds [2]: Extended commands [n]: y Source address or interface: Type of service [0]: 0x10 Set DF bit in IP header? [no]: Validate reply data? [no]: Data paaern [0xABCD]: Loose, Strict, Record, Timestamp, Verbose[none]: Sweep range of sizes [n]: Type escape sequence to abort. Sending 5, 100- byte ICMP Echos to , 5meout is 2 seconds: Packet sent with a source address of Success rate is 0 percent (0/5) cxi #ping Protocol [ip]: Target IP address: Repeat count [5]: Datagram size [100]: Timeout in seconds [2]: Extended commands [n]: y Source address or interface: Type of service [0]: Set DF bit in IP header? [no]: Validate reply data? [no]: Data paaern [0xABCD]: Loose, Strict, Record, Timestamp, Verbose[none]: Sweep range of sizes [n]: Type escape sequence to abort. Sending 5, 100- byte ICMP Echos to , 5meout is 2 seconds: Packet sent with a source address of !!!!! Success rate is 100 percent (5/5), round- trip min/ avg/max = 72/73/76 ms
5 Selec5ve Packet Loss (con t)? cxi #ping Protocol [ip]: Target IP address: Repeat count [5]: Datagram size [100]: Timeout in seconds [2]: Extended commands [n]: y Source address or interface: Type of service [0]: 0x10 Set DF bit in IP header? [no]: Validate reply data? [no]: Data paaern [0xABCD]: Loose, Strict, Record, Timestamp, Verbose[none]: Sweep range of sizes [n]: Type escape sequence to abort. Sending 5, 100- byte ICMP Echos to , 5meout is 2 seconds: Packet sent with a source address of Success rate is 0 percent (0/5) cxi #ping Protocol [ip]: Target IP address: Repeat count [5]: Datagram size [100]: Timeout in seconds [2]: Extended commands [n]: y Source address or interface: Type of service [0]: Set DF bit in IP header? [no]: Validate reply data? [no]: Data paaern [0xABCD]: Loose, Strict, Record, Timestamp, Verbose[none]: Sweep range of sizes [n]: Type escape sequence to abort. Sending 5, 100- byte ICMP Echos to , 5meout is 2 seconds: Packet sent with a source address of !!!!! Success rate is 100 percent (5/5), round- trip min/ avg/max = 72/73/76 ms
6 More Network Problems? Packet loss tend to be network infrastructure related. TCP SEQ is the same, but NEXT EXPECTED SEQ goes up. Is that OK? How does IP.ID help here? What does it prove? We can never be sure, but analysis can point us in the right direc5on.
7 Don t be so quick to judge Applica5on response is slow. What are the usual suspects? There is a difference between SEND and RECEIVE window sizes. What does Stevens say? Not all Windows Update are the same. What should you not see? How do you fix it? Ul5mately, whose fault is it?
8 Internet is the Internet, right? Customer sent us the trace but gave us liale context His applica5on was encountering performance issues with an external vendor. Vendor indicated that the issue was not on their end. It was a network/proxy issue, or was it? Let s examine the evidence Some5mes, you have to look at the IP layer to ferret out the answer. Can we rule out packet loss?
9 Internet is the (con t) TTL TTL is a field set by the originator of a packet. Created to prevent a packet from infinitely looping around networks/internet. Value is decremented at every router hop. Can allow determina5on of how many hops a packet has traversed Provides some level of confidence as to whether 2 packets were originated by the same source and even allow passive stack fingerprin5ng.
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