From: Matthew Seppeler (matthew.seppeler@inxi.com)
Date: Fri Jul 27 2007 - 14:37:30 ART
Not sure if this can be done but figured I would post to see if anyone
may have the answer.
I'm doing a SRT to see if you can nat outside of multiple interfaces on
the same router without having to make manual configuration changes.
You have 3 default routes in the routing table, each one associated with
a Vlan (Vlan 10,20 & 30). At any given time only one of these default
routes will be in the routing table and will be determined whether the
port is in an Up/Up status and/or by the administrative distance of the
static in the routing table.
Vlan10 - Ethernet handoff
ip route 0.0.0.0 0.0.0.0 Vlan10 251
Vlan20 - Wireless handoff
ip route 0.0.0.0 0.0.0.0 Vlan20 252
Vlan30 - UMTS/GPRS modem
ip route 0.0.0.0 0.0.0.0 Vlan30 253
The inside source list will remain the same (ie. 192.168.1.0/24 on
Vlan50). However, depending on the situation, the router may only be
connected to the Internet via an Ethernet handoff (ie, DSL, Satellite,
Cable Modem, etc.) Wireless handoff and/or a cellular data card. If all
three are Up/Up, then it takes the Vlan10 as it has the lowest AD.
However, if you do not physically plug something into Vlan10's Ethernet
port then it will be in a Up/Down state and remove its static from the
routing table. Being the case, then Vlan20 is next in line provide its
Vlan interface is Up/Up. If not, then Vlan30 will be the last choice up
Internet connectivity for the router. So in short, the router is kind
of like a "box of chocolates, you never know what you are going to get."
Being the case, I was wondering if there was a way to configure NAT so
that you can use the same inside source list of addresses but have
multiple outside interfaces (Van,20&30) and have NAT automatically work
without having to make any manual NAT configuration changes.
Matt Seppeler
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