From: Robert LaGrasse (rlagras1@xxxxxxxxxxxxxxx)
Date: Tue Aug 22 2000 - 22:58:42 GMT-3
I've never tried to do this with ISDN, but you should be able to setup IRB
and assign the BVI your ISDN interface and your ethernet interface to the
same bridge group. This is if you absolutely have to do it this way -- it's
not all that clean.
The other two (preferred) ways to do this are:
1) The NAT solution with static mappings if you need addresses to remain the
same.
2) Assign an address from your subnet to your ethernet interface, take
whatever IP address the ISP hands you (or run unnumbered) and use a routing
protocol to advertise your network's availability to the ISP.
Good Luck.
-B
-----Original Message-----
From: Derek Buelna <dameon@aracnet.com>
To: ccielab@groupstudy.com <ccielab@groupstudy.com>
Date: Tuesday, August 22, 2000 6:43 PM
Subject: Special IP Bridging Trick
>Hi,
>
>Please excuse me as this isn't directly lab related.
>
>I dial into my ISP's PRI with my BRI. (only thing available)
>I bought a static IP so regardless of whether I set it or configure DHCP, I
>get assigned the same address.
>My next hop always changes, depending upon which PRI I come into.
>I bought a 'subnet' as they called it and now my IP changed. They gave me
>six consecutive addresses on the same net and said that I should use the
>first one for the BRI. That is the only thing they can do. They can't
>provide me with a net and mask and start routing traffic to it.
>
>The only way I now how to deal with this is to use private addresses inside
>and then do static translations for inside hosts. NAT.
>
>However, the ISP told me that somehow, I can do bridging on a Cisco. I mean
>I know how to configure basic bridging but: I would like for the Ethernet
>to have a static public address and assign public addresses to a few hosts
>on that Ethernet. This way my gateway for inside hosts would always be the
>same. (useful for encryption configs)
>
>Your thoughts would be very much appreciated.
>
>Thanks,
>
>-Derek
>
>Derek A. Buelna, CCNP CCDP MCSE
>Network Engineer
>Firstworld Communications
>
>
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