[Xorp-users] Re: xorp fails to detect multicast traffic arriving over a GRE tunnel in Linux.

[Pavlin Radoslavov]

> Interesting, I had a similar issue with my DSL Modem (Speedstream 5100b)
> in pppoe-on-device mode with both gif and tun devices.

Your problem is probably different. In my case it appears that the
DSL modem/NAT/firewall (2Wire HomePortal 1000) supports only TCP,
UDP and ICMP, so I can't configure it to enable any other protocols
(including GRE).

FYI, I am able to use openvpn tunnels but those use UDP or TCP-based
encapsulation. I don't know about the CPU load because I've used
openvpn only for testing purpose with low bandwidth traffic.

Regards,
Pavlin


> 
> pppoe-on-device mode is when the 5100b terminates the pppoe connection
> and hands the public IP address to the computer (in this case, my
> FreeBSD router) via DHCP. This seems to break gif/tun functionality.
> 
> if I terminate pppoe on the FreeBSD router (pass through the 5100b) all
> worked perfectly, but put a greater cpu load on the pc than I cared for
> at the time.
> 
> I wonder if there is some way around this.