Fedora xen - Nov 2006 - scp in FC6 + Xen gets stuck in "stalled" stage

I am trying to get scp to work. It gets stuck displaying "stalled"
message.

 

I did "iptables stop". But does not help.

 

This happens in the Xen that I built with xen-3.0.3-rc3 which builds it
with 2.6.16.29 kernel in Fedora Core 6.

 

I boot into Fedora provided   FC6 Xen host and tried scp and it works.

 

What settings did I miss in configuration ?

 

Regards

Shobha Ranganathan

"The significant challenges we face cannot be resolved at the same level
of thinking we were at when we created them." Albert Einstein

On Wed, 15 Nov 2006, Ranganathan, Shobha wrote:
> I am trying to get scp to work. It gets stuck displaying
"stalled"
> message.
> This happens in the Xen that I built with xen-3.0.3-rc3 which builds it
> with 2.6.16.29 kernel in Fedora Core 6.
> I boot into Fedora provided   FC6 Xen host and tried scp and it works.
Looks more like an MTU isuse. Try using clamping:

iptables -I FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS 
--clamp-mss-to-pmtu

Otherwise, try pinging with different size packets until it fails, and then use
the last successful packet size (eg 1440) to:

iptables -I FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --set-mss 1440

Paul