tcp rst after get / http

asked 2018-01-09 18:06:24 +0000

Tbrown748
1 ●1 ●1 ●2

updated 2018-01-09 18:07:10 +0000

Users trying to reach atnitribes.org but receive a 'connection reset by peer' message from the webfilter. Bypassed the filter and it says 'cant connect'

Looking at wireshark it shows a tcp rst,ack after a GET / HTTP -- ACK. This would lead me to believe that the server is sending back the tcp rst but I am not sure.

This site appears to be accessible from another rout on our network that still uses the same ISP as well as if we use a vpn proxy.

Is there anyway to discern from the trace if this is on my end or the websites end? Thanks, https://imgur.com/kTkEOyw

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answered 2018-01-09 19:00:43 +0000

mrEEde
4033 ●16 ●48 ●77

updated 2018-01-10 05:40:14 +0000

From the picture it appears the reset comes from a F5 load balancer after suffering a 4 seconds timeout.

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Just a wild guess though ...
Regards Matthias

If your network doesn't have a F5 BIG-IP then is must be somewhere else.
Typically load balancers are sitting close to the server - but anything is possible..
If you look at the ip.ttl of the incoming reset you know (can guess) how far away in number of hops it is.
The (default) initial TTL of a F5 is 255 so if it is lower than 253 it is probably not in your scope ...

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Right, I thought BIG-IP would be an F5 appliance. We don't even have an F5 on our network so with that it must not be on our end?

Tbrown748 ( 2018-01-09 19:03:46 +0000 )edit

If you look at the ip.ttl of the incoming reset you know (can guess) how far away in number of hops it is. The (default) initial TTL of a F5 is 255 so if it is lower than 253 it is probably not in your scope ...

mrEEde ( 2018-01-10 05:34:31 +0000 )edit

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