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Forums » US Cable Support » Comcast » Comcast HSI » Comcast is using Sandvine to manage P2P Connections
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[Spam] Comcast reporting spam from my IP »
« [CDV] Outgoing Static on calls  
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funchords
Robb
Premium,MVM
join:2001-03-11
Hillsboro, OR
·Verizon Online DSL
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reply to Anonymous Coward
Re: Comcast is using Sandvine to manage P2P Connections

said by Anonymous Coward :

Has anyone tried configuring their firewall to block incoming RST packets?
Yes, I tried this with linux iptables, and got really excited when it seemed to thwart the problem. But then I realized that the connections were dead, but they simply weren't being removed from the active list.

I believe this means that the RST is sent both ways. The response to an RST is not a FIN so the TCP/IP stack doesn't know the connection has been dropped.

Good thinking, though.

said by no oper :

I also noticed, that bit 6 of the IP TOS field was set on all these reset packets.
I hadn't noticed. They could have been set, or not. Are you directly connected? -- or could your router be adding that bit for use on the LAN?
--
Robb Topolski -= funchords.com =- Hillsboro, Oregon USA
~ Keeper of the D-Link FAQ ~ Did you Search? ~ More features, Free! Join BBR! ~
to forum · permalink · · 2007-07-22 20:39:54 · Reply to this


no oper

@comcast.net
said by funchords See Profile :

I hadn't noticed. They could have been set, or not. Are you directly connected? -- or could your router be adding that bit for use on the LAN?
I'm not directly connected, there's a router on the way, but this bit is set only on the reset packets I'm receiving on the bittorrent connections and nowhere else.
to forum · permalink · 2007-07-22 22:08:15 · Reply to this


koitsu
Premium
join:2002-07-16
Mountain View, CA

reply to funchords
said by funchords See Profile :

I believe this means that the RST is sent both ways. The response to an RST is not a FIN so the TCP/IP stack doesn't know the connection has been dropped.
Correct . See the below stateful diagram (PDF):

»www.cse.iitb.ac.in/perfnet/cs456···diag.pdf
--
Making life hard for others since 1977.
I speak for myself and not my employer/affiliates of my employer.
to forum · permalink · · 2007-07-23 10:36:56 · Reply to this
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« [CDV] Outgoing Static on calls  

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