Userland PPP/PPTP tunneling problem

Brett Glass brett at lariat.org
Fri Apr 18 15:41:43 PDT 2003


At 04:22 PM 4/18/2003, Chris Luke wrote:
  

>Tunnels are point-to-point connections. Each end of the link
>has an address, even if inherited from another interface,
>and these addresses are either known in advance, or exchanged or
>negotiated by a higher-level protocol, such as the negotiation
>stuff in PPP. Thus the address of the far end is known, and is
>entered as a route into the forwarding table.

Even assuming that you don't need ARP (and SOMEONE has to do
ARP if you're going to get to other addresses on the LAN you're
tunneling into), there are many applications that do need
to send out a broadcast. HP JetDirect and LapLink are two which
I know these folks to be using. The broadcast address should
be the correct one for the LAN into which you're tunneling, or
these products won't work.

--Brett



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