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[lwip-devel] RE: [bug #20075] A problem with keep-alive timer and TCP fl

From: Gollakota, Srinivas
Subject: [lwip-devel] RE: [bug #20075] A problem with keep-alive timer and TCP flags
Date: Wed, 6 Jun 2007 09:47:18 -0400

I checked few related documents in the net. The below document it
appears like linux kernel uses ACK flag set for keep alive probes.
Please see section 2.1 in the below link.


But in RFC1122 (Requirements for Internet Hosts -- Communication Layers
section talks about keep-alive probes and TCP sequence number
but not about TCP flags.



-----Original Message-----
From: Oleg Tyshev [mailto:address@hidden 
Sent: Wednesday, June 06, 2007 6:10 AM
To: Kieran Mansley; Srinivas Gollakota; Oleg Tyshev;
Subject: [bug #20075] A problem with keep-alive timer and TCP flags

Follow-up Comment #2, bug #20075 (project lwip):

I think keep-alive packets should not send ACK flag.
Data are already acknowledged.
We need acknowledge only as reply to keep-alive packet.
So, it will be better TCPH_FLAGS_SET( tcphdr, 0);


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