[Openswan Users] fragmentation is not working with openswan/l2tpd

Paul Wouters paul at xelerance.com
Wed Jan 11 16:37:26 CET 2006

On Wed, 11 Jan 2006, Joji Joseph wrote:

>      I am using openswan-2.4.4 and l2tpd-0.69 in a Redhat 9.0 Linux box
> with openswan patched 2.4.20 kernel. My box is actually an L2TP client
> and trying get connected to a SOHO gateway L2TP server.
> The issue is, when I am trying to access the SOHO device web page, the
> ppp0 interface is sending http GET request of packet size 550.
> But in ipsec0 interface, this packet is converted as a ppp over l2tp
> packet of size 548 and the packet is getting fragmented.

There were mtu issues with ipsecX interfaces. You might be bitten by
bug #518. Can you try 2.4.5rc3?

> The main thing is the second fragment is sending at the first without
> encapsulating as a ppp over l2tp packet and it is using the wan IP
> address itself as its source and destination IPs.

Fragmentation at the l2tp layer usually means your connection will not


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