This is a fairly common error w/ 2.4.x. Actually, error is the wrong word; more like warning. The only reason you're seeing it is because TCP_DEBUG is defined. If it's annoying, you can undefine it in linux/include/net/tcp.h.
On Fri, Apr 06, 2001 at 12:03:40PM -0400, Noah L. Meyerhans wrote: > > This was logged by one of my servers the other day (potato, upgraded > with the necessary packages to run kernel 2.4.2): > > Mar 31 08:40:48 debian kernel: TCP: peer xxx.xx.xx.xx:41760/20 shrinks > window 3735214707:8280:3735227987. Bad, what else can I say? > > The IP address, obviously, has been replaced with x's here. I haven't > ever seen the message before. I have heard of some vulnerabilities in > various firewall code that allows bogus IP header 'offset' fields to be > used to avoid firewall packet matching rules. Might this be an attempt > at something like that? Might this merely have been a packet that got > horribly mangled somewhere on the internet, completely unintentionally? > > Any thoughts? > > Thanks. > noah > > -- > _______________________________________________________ > | Web: http://web.morgul.net/~frodo/ > | PGP Public Key: http://web.morgul.net/~frodo/mail.html > -- "... being a Linux user is sort of like living in a house inhabited by a large family of carpenters and architects. Every morning when you wake up, the house is a little different. Maybe there is a new turret, or some walls have moved. Or perhaps someone has temporarily removed the floor under your bed." - Unix for Dummies, 2nd Edition -- found in the .sig of Rob Riggs, [EMAIL PROTECTED]