PPPoE and LVS router

[Hideki]

Hi.
I have currently set up LVS like this,

| WAN : Internet | - | PPPoE Router + LVS | - | LAN : 2 real servers |

The PPPoE router is a single machine (for now) which handles the PPPoE 
connection as well as LVS (in NAT form with least connection forwarding 
method) toward its real servers (HTTP) in the LAN. When I access the LVS 
from inside the LAN, the requests get passed to the real servers and back 
to the client fine. But when accessed from the WAN, the machines stop 
responding after the content size goes beyond 1402 bytes. I just guessed 
this has something to do with PPPoE packet size and that is the reason 
server stops responding right after the size becomes 1403 bytes big.

I have a 2.6.19 kernel and version 1.24 of ipvsadm.

In the iptables on the router, I have the mss fix packet mangling, so that 
SNAT works fine fetching data from the internet back to the LAN machines.

iptables -t mangle -A POSTROUTING -p tcp --tcp-flags SYN,RST SYN -o ppp0 -j 
TCPMSS --clamp-mss-to-pmtu

I wonder what can be done to fix this problem. TIA.

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