peer shrinks window

peer shrinks window

[Marco d'Itri]

In two days I've got 46 messages like:

Mar  7 08:00:55 attila kernel: TCP: peer 163.162.41.4:37582/20 shrinks window 752789960:5840:752797200. Bad, what else can I say?

If needed I can ask about the os running there, I think it's solaris.
(nmap confirms: Solaris 7)

Linux attila 2.4.0-test11 #11 Wed Dec 13 12:02:51 CET 2000 ppc unknown

-- 
ciao,
Marco

Re: peer shrinks window

[Andres Salomon]

I've noticed this as well in my logs.  In linux/include/net/tcp.h,
TCP_DEBUG is turned on; in linux/net/ipv4/tcp_input.c,
tcp_ack_update_window() contains the following:

#ifdef TCP_DEBUG
<snip>
printk(KERN_DEBUG "TCP: peer %u.%u.%u.%u:%u/%u shrinks window %u:%u:%u. Bad, what else can I say?\n",
                               NIPQUAD(sk->daddr), htons(sk->dport), sk->num,
                               tp->snd_una, tp->snd_wnd, tp->snd_nxt);
<snip>
#endif

Is it really necessary for TCP_DEBUG to be turned on by default?

On Sat, Mar 10, 2001 at 12:45:56AM +0100, Marco d'Itri wrote:
> 
> In two days I've got 46 messages like:
> 
> Mar  7 08:00:55 attila kernel: TCP: peer 163.162.41.4:37582/20 shrinks window 752789960:5840:752797200. Bad, what else can I say?
> 
> If needed I can ask about the os running there, I think it's solaris.
> (nmap confirms: Solaris 7)
> 
> Linux attila 2.4.0-test11 #11 Wed Dec 13 12:02:51 CET 2000 ppc unknown
> 
> -- 
> ciao,
> Marco

-- 
"... 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, rriggs@tesser.com