Mike Silbersack wrote:
silby 2008-02-24 05:13:20 UTC
FreeBSD src repository
Modified files:
sys/netinet tcp_var.h
Log:
Change FreeBSD 7 so that it returns TCP options in
the same order that FreeBSD 6 and before did. Doug
White and the other bloodhounds at ISC discovered that
while FreeBSD 7's ordering of options was more efficient,
it caused some cable modem routers to ignore the
SYN-ACKs ordered in this fashion.
Could you be more specific on which models/firmware choke
on this? I'd like to document all known broken devices and
share the information with other TCP implementors. Also I
want to try to contact the vendor and have them fix the issue.
--
Andre
The placement of sackOK after the timestamp option seems
to be the critical difference:
FreeBSD 6:
<mss 1460,nop,wscale 1,nop,nop,timestamp 3512155768 0,sackOK,eol>
FreeBSD 7.0:
<mss 1460,nop,wscale 3,sackOK,timestamp 1370692577 0>
FreeBSD 7.0 + this change:
<mss 1460,nop,wscale 3,nop,nop,timestamp 7371813 0,sackOK,eol>
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