[clug] Treason uncloaked!
tony at bakeyournoodle.com
Wed Sep 20 23:46:51 GMT 2006
On Thu, Sep 21, 2006 at 09:29:49AM +1000, Michael James wrote:
> Quite frequently /var/log/messages offers this intriguing entry:
> kernel: TCP: Treason uncloaked!
> Peer 10.0.1.95:514/1023 shrinks window
> 3222363773:3222384045. Repaired.
> As you can see from the IP, it's a private subnet,
> it's my machine that's being complained about.
> What's it likely to be? (curiosity)
The comment above the printk() says:
/* Receiver dastardly shrinks window. Our retransmits
* become zero probes, but we should not timeout this
* connection. If the socket is an orphan, time it out,
* we cannot allow such beasts to hang infinitely.
> Is it anything I should worry about?
It's the reciever that's causing the problem so talk to them.
What OS is the reciever?
> If it is, what could I do to fix it?
If you can trigger it at will, try tuning off window scaling.
echo 0 > /proc/sys/net/ipv4/tcp_window_scaling
To see if that fixes things.
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