[Techtalk] no gateway, yet it works!

[Meredydd Luff]

In fact, I have no need for DHCP anyway, as I like being able to address any 
machine uniquely, and the home network is small enough for that to be 
worthwhile - I was just interested in the idea proxy ARP as a (rather neat) 
method for avoiding any extra knowledge required on the client. Shame about 
the ARP table limit, really...

Meredydd

On Thursday 12 September 2002 14:43, Maria Blackmore wrote:
> On Thu, 12 Sep 2002, Meredydd Luff wrote:
> > Ooh, never heard of that. Sounds like an interesting idea, although a
> > DHCP-handed-out gateway seems like a better idea to me. Could you give a
> > link for a bit more information (eg how to set a machine up to do it, if
> > indeed it can be done without specialised hardware)?
>
> Hi
>
> under linux, as root
>
> echo 1 > /proc/sys/net/ipv4/conf/eth0/proxy_arp
>
> :)
>
> replacing eth0 with whatever ethernet interface, as appropriate
>
> on a cisco router, enable, then do
>
> conf t
> int eth0
> ip proxy-arp
> ^Z
>
> once again replacing eth0 with the appropriate interface.
>
> On the client machines on the network simple tell them that the whole
> internet is reachable on the local network (network mask 0.0.0.0)
>
> the things doing the routing will need to have a properly and fully
> configured routing table so that it knows that the client machines can be
> reached out of a particular interface
>
> please remember that by doing this you will get an entry in your ARP table
> for every single host that is visited.  Frequently there is a limit on the
> size of an ARP table, when it is reached some things will handle it more
> gracefully than others.  Cisco kit has a tendancy to simply reload itself
> in this situation, others might age out ARP table entries more quickly.
>
> I would always recommend setting up routing and networks explicitly unless
> you have some urgent requirement for the flexibility it can give.
> DHCP will frequently give a better solution, imho.
>
>
> Maria
>
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