Re: Multiple interfaces with the same IP address

[Greg Wilson-Lindberg <gwilson@spacex.com>]

Ok, I can use route to add the various IP addresses that are on each HDLC channel to the routing 
tables.  There are a lot of machines, but because the addresses are well known/formatted, generating 
the scripts automatically won't be to bad.  But how do I handle broadcast addresses such as 
172.16.255.255, 172.16.128.255, or 172.16.129.15 that need to go out all of the HDLC channels?

Oskar Berggren wrote:
> 2009/10/7 Rick Jones <rick.jones2@hp.com>:
>> Greg Wilson-Lindberg wrote:
>>> Rick Jones wrote:
>>> ...
>>>
> 
>> I have not fully parsed the manpage for the ip command, but it does have
>> tidbits which suggest being able to specify interfaces by name when
>> manipulating routing tables.  If that is correct you should be able to add
>> specific host routes pointing-out specific interface names if you are indeed
>> forced to put assign the same IP address to each of the HCLC interfaces on
>> the "gateway."
>>
> 
> Yes,
> 
>   ip route add x.x.x.x/x dev eth1
> 
> or similar works fine.
> 
> If you like, you can also use ip addr add x.x.x.x/32 dev eth1 to set
> an ip-address without having the kernel automatically install a subnet
> route. Then manage the routing tables complete by yourself.
> 
> /Oskar
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