Why can't packets get back to the bridge?

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mauricev
Posts: 32
Joined: Tue Feb 11, 2014 12:22 am

Why can't packets get back to the bridge?

Post by mauricev » Thu Feb 13, 2014 6:49 am

Using OS X (1.6.8) with L2TP to create a remote VPN tunnel under Linux, I have first discovered that the connection requires SecureNAT and DHCP. Without either, OS X fails to even consider negotiating a connection. That is, SoftEther seems to just ignore it.

With a connection in place, SoftEther does assign both a MAC and an IP (from its DHCP). The remote OS X client can sent ping packets to the Linux VPN server. They cross the bridge and do reach the target (also OS X). It responds with a ping packet, but this packet never gets back to the real interface the bridge is assigned to. The target OS X system has the assigned MAC in its arp table, but oddly, the Linux server does not.

mauricev
Posts: 32
Joined: Tue Feb 11, 2014 12:22 am

Re: Why can't packets get back to the bridge? [answered]

Post by mauricev » Fri Feb 14, 2014 6:48 pm

I am an idiot. My SoftEther is running under VMWare and it had to be configured (in two places) to allow promiscuous mode.

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