[c-nsp] *** GMX Spamverdacht *** How to use IPs from the same network on two separate interfaces?

Andrew Miehs andrew at 2sheds.de
Sun Jul 17 07:57:14 EDT 2016

You could also create an SVI and put bother interfaces into a Vlan. I would however wonder you shouldnt reconsider the purpose of the requirement.

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> On 17 Jul 2016, at 20:27, Garry <gkg at gmx.de> wrote:
>> On 16.07.2016 13:11, Brandon Orwell wrote:
>> GigabitEthernet0/0 contains an IP address that is connected to our
>> provider/BGP drop;
> Why use part of your /24 or larger to do the connection to your ISP with? This is not how it should be done ...
>> When I try to assign .252 to GE0/0 and .1 to GE0/1, I get the usual errors
>> about the subnet already existing on another interface.
>> How do I go about doing this? How do I assign IP in A.B.C, such as
> Don't. Just don't. If you have overlapping network ranges, all kinds of things can - and will - go wrong, even if you trick the router into making it work ... ask your provider to assign a transfer network outside of your /24 or whatever for the uplink (e.g. something between a /29 to /31), you'll save yourself a lot of headaches.
> N.b.: You could do something like that with VRF routing, which your router would need to support.
>> possible? I am imagining something to do with NAT and matching response
>> with a given source IP for certain ICMP packets (but this wouldn't work
>> for, say, UDP traceroute?).  Any ideas there either?
> Yes, 1:1 NAT would work, too ... but this adds to the strain of the router, as it has to rewrite every single packet it forwards, instead of just pushing it through with CEF.
> -garry
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