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Bug #1667

L2TP server does not respond properly from a CARP VIP

Added by Jim Pingle almost 9 years ago. Updated about 8 years ago.

Status:
New
Priority:
Normal
Assignee:
-
Category:
L2TP
Target version:
-
Start date:
07/11/2011
Due date:
% Done:

0%

Estimated time:
Affected Version:
2.0
Affected Architecture:
All

Description

If you setup an L2TP server and try to connect to a CARP VIP on the same interface, it does not work. The server responds from the interface IP rather than the CARP VIP.

The PPTP server does not suffer the same limitation (though it is TCP, not UDP.)

Can be worked around by adding a port forward on the CARP VIP to the WAN IP for udp/1701.

History

#1 Updated by Chris Buechler about 8 years ago

  • Target version deleted (2.1)

#2 Updated by Jim Pingle about 8 years ago

This seems to be the classic UDP problem where the system will source the reply from the "closest" address rather than a specified. I didn't see a directive for mpd to bind only to a specific IP so there may not be a good way around this.

Using the port forward method works fine, we may just have to document the issue rather than trying to hack around it in a non-intuitive way.

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