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Old 09-11-2013, 01:07 PM   #1
ssaglauskas
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Analyze tcpdump output


hello everyone. I have a problem of communication between two servers, and because of that I need to know if the output of tcpdump <nop,nop,sack 1 {616723:616724}> has to do with some communication problem or another.
 
Old 09-11-2013, 01:17 PM   #2
ssaglauskas
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The problem is timeout during a copy.
 
Old 09-11-2013, 01:20 PM   #3
unSpawn
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Quote:
Originally Posted by ssaglauskas View Post
hello everyone.
Welcome to LQ. Hope you like it here.


Quote:
Originally Posted by ssaglauskas View Post
I have a problem of communication between two servers, and because of that I need to know if the output of tcpdump <nop,nop,sack 1 {616723:616724}> has to do with some communication problem or another.
Way too little information in that snippet for me. If you're not able to post more then disable SACK and see if that works for you. If it doesn't tell us (or tell us anyway) about both hosts OS, if Linux kernel version, network HW and network stack sysctls.
 
Old 09-12-2013, 02:33 PM   #4
nini09
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The TCP SACK is for TCP retransmission. Yes, connection has some problem and TCP try to recover it.
 
  


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