[L2tp-develop] lns only likes 1 peer udp port

[Simon H. <sd...@ab...>]

Hi Bill

I have my driver working but I'm running into problems with the RH 6.2 LNS.

My re-write of data_xmtr.c uses sockets, one socket on udp 1701 for
listening and then 1 socket per created tunnel. All l2tp data packets are
sent on the socket for the appropriate tunnel. This causes a problem for the
RH 6.2 LNS. because of the following in data_xfer.c:


      /* I think the peer is allowed to change his UDP address in his first
msg... */
      else if ( tun->peer_udp != peer_udp )
        {
          /* FIXME: some implementations may move source UDP port
           * to fix this, an interface needs to be created at data layer
           * and signaling layer connectors to allow transport to set the
           * udp address.  transport also has to be changed to something
like
           * in rx_ctrl, if known peer_udp == 0, use new port & tell data
layer. */
          L2TP_LOG_severe( ( "udp addresses do not match.  This could be a
hack or an implementation problem, see code" ) );
          status = L2TP_STATUS_peer_udp_port_incorrect;
        }


Is this the same situation in the RH7.1 release? Any chance of fixing this ?

I need to come back to you RE the processing of lcp packets in
/ppp/pppd/l2tp.c (rej/nak ing certain packets). When I get a moment, I'll
respond.

Simon