Re: ip routing?

From: David Efflandt (efflandt_at_xnet.com)
Date: 08/17/03 

Date: Sun, 17 Aug 2003 15:19:33 +0000 (UTC)

On Sun, 17 Aug 2003 11:17:10 GMT, saul <sol1@bigpond.net.au> wrote:
> I've got a routing/gateway problem and I can't seem to work out what's going
> wrong.
>
> I have asked my host to route a c-class to my server, which they said they
> have done, and I have routed the IPs (using aliases) onto the box, but when
> I ping any of the IPs they don't reach my box. When I do a traceroute on any
> of the c-class IPs they reach the hosts' network (gateway?) and stop there
> without reaching my server's IP.
>
> I am sure that I have set up the IP aliases correctly. To me it seems like
> my host has not routed the c-class to my servers' IP. I'm not really an
> expert on IP routing, and I don't really know what to suggest to my host?
>
> I would really appreciate any advice on this matter, and maybe some
> directions for what my host needs to do to direct the c-class IPs to my box?

I am puzzled by the term 'host'. Are you attempting to route IPs from an
outside internet host to your local system (source routing)? I doubt if
that would work without cooperation of your ISP, since their routers would
NOT know to route those IPs to you (especially if your IP is dynamic).

Also not sure what you are doing with aliases. Typically if you had a
netblock from your ISP, the netblock would be routed to your connecting
internet IP, and it is up to you to distribute them from there with your
routing. One potential mistake is having the wrong netmask for internet
interface, resulting in duplicate routes for subnet, and packets going the
wrong way from there (back out to internet).

For routing problems, the output of ifconfig and 'route -n' might allow
someone to help you fix it. But with incomplete info, we cannot even tell
exactly what you are trying to do. 

-- 
David Efflandt - All spam ignored  http://www.de-srv.com/
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