efflandt
join:2002-01-25
Elgin, IL
 ·AT&T Midwest
| reply to fiendlittlewing
Re: Home Server connection problems
By default Linux does not like fragmented packets. PPPoE has an 8 byte header, therefore max mtu is 1492.
Try changing the Linux LAN nic of the server to mtu 1492. You can test that on the fly as root (su -) with "ifconfig eth0 mtu 1492" (or "/sbin/ifconfig eth0 mtu 1492" from a network script when eth0 comes up). That resolved an issue I had trying to send smtp to sendmail on Linux behind a PPPoE router (so it sends proper MSS for the MTU). This is an example (different eth):
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