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Re: weird tcp syn problem

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On Thursday 09 August 2001 08:09 am, Peter Billson wrote:
> I'm sure you have already tried all this but:
> > echo  > /proc/sys/net/ipv4/tcp_syncookies
>   That should be echo "1" > /proc/sys/net/ipv4/tcp_syncookies
> > However, after fruitlessly trying to echo /anything/
>   Does /proc/sys/net/ipv4/tcp_suncookies exist? It should.
> > got corrupt.  So, I recompiled the kernel
>   You need to turn Syn Cookies on during kernel configuration. Your
> /usr/src/linux/.config should show: CONFIG_SYN_COOKIES=y
>   Also be sure that if you are using iptables that you DO NOT have
> ipchains support compiled in your kernel also. The config utility will
> let you do this (this really should be reported as a bug) but things
> will break and weird things will happen if you do this.
> Pete

Okay, this is bloody weird.  It wasn't turned on.  HOWEVER, and I'm only 
shouting to stress this, I've been using this box with the 2.4.4 kernel for 
*months*.  And I just went back and looked at the source tree, and it also 
didn't have SYN defined.  So now I'm just confused, as opposed to being lost 
and confused :-)  Oh, well.  It's recompiling right now, and that will 
hopefully fix it.  I'll chalk this up to human error (much more believable 
that I screwed up somewhere than the alternative) and move on.  Thanks 

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