Dobler wrote:Using 4.1.20 on Solaris. Still having the same issue. I may try downgrading.
OK, to make things more interesting, I have identical VBox environments (4.1.8r75467) running on two host Ubuntu 10.04 LTS x64 systems. I created a new Ubuntu 12.04 server VM and configured it with OpenSWAN, ppp, and xl2ptd and copied it to both servers. On one of the servers, net.ipv4.ip_forward = 1 works as expected. On the second one, it's not forwarding. I have verified that /proc/sys/net/ipv4/ip_forward is set to "1". Are we dealing with an issue with the host's NIC driver (the hardware is different on the 2 servers)? This is most confusing. I don't know where to begin on troubleshooting this. As I stated when I stated this thread, I though it was release specific. Now I'm not so sure. I haven't tried this out on the new 4.2 release yet. I have other servers available and will try to reproduce the problem on them (the existing 2 servers are in production).