Q: Routing 1 host/subnet through 1 ISDN B chan + default route through other B chan

Q: Routing 1 host/subnet through 1 ISDN B chan + default route through other B chan

Post by Bob Bosiljev » Fri, 18 Oct 1996 04:00:00



Ok. I've got the router connected to two different networks via each B channel
of a BRI. My question now is,

How do I instruct the router to distinguish which packet goes on which B
channel?

I have the default route going to the right place (ISP) but I need to be able
to get at ONE host on the other network (through the other B chan). As it sits
right now, packets going to that one host go out the default route.

Any help or pointers would be appreciated.

Thanks in advance,
Bob.

 
 
 

1. Q: Routing 1 host/subnet through 1 ISDN B chan + default route through other B chan

==>
==>Ok. I've got the router connected to two different networks via each B channel
==>of a BRI. My question now is,
==>
==>How do I instruct the router to distinguish which packet goes on which B
==>channel?
==>
==>I have the default route going to the right place (ISP) but I need to be able
==>to get at ONE host on the other network (through the other B chan). As it sits
==>right now, packets going to that one host go out the default route.
==>
==>Any help or pointers would be appreciated.
==>

The router will place the packet on the call that is open to the next hop
router specified in the dialer map.

I would expect that you have a config like this:

int b 0
ip addr 172.16.1.1 255.255.255.0
dialer map ip 172.16.1.2 name ISP broadcast 5551234
dialer map ip 172.16.1.3 name REMOTE broadcast 5559876

ip route 172.16.2.0 172.16.1.3
ip route 0.0.0.0 0.0.0.0 172.16.1.2
ip classless

Now, if you need to reach the network 172.16.2.0 at the other remote
site, a call will be placed to the site whose IP address is 172.16.1.3.
Once that call is up, we will place packets to that site on the call
that is opened to the site ISP.  Any packet that is not destined to
172.16.2.0 will follow the default route which causes a call to be placed
to the site whose IP address is 172.16.1.2.

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