>On Mon, 5 Apr 1999, andrea wrote:
>
>> [etc.]
>
>If I read you correctly, what you want to do is something like this:
>
>         internet
>            |
>        main router
>        192.168.1.1/24
>            |
>            |-- other hosts on 192.168.1.0/25 subnet
>            |
>        192.168.1.2/25
>        sub-router
>        192.168.1.129/25
>            |
>            |-- other hosts on 192.168.1.128/25 subnet
>            |
>
>In other words, you have split your network into two subnets, but
>because you have no control over the `main router' above, you cannot
>inform it of the new subnet mask, so it believes that all the hosts
>on the 192.168.1.128 subnet are local.


Correct!:)

>
>This is not hard to solve; you just turn on routing in the sub-router
>box and enable proxy-arp. This will cause the subrouter box, when
>it receives an arp request for the 128/25 subnet on the 0/25
>interface, to reply to that ARP with its own address. The host that
>requested the arp then sends all packets to the sub-router, and
>normal routing gets it to its destination.
>
>The question is, does NetBSD do this properly? I think it does,
>but I'm lacking the AUI/10base-T transceiver I need to test this
>out right now. However, in theory, if you have a host 192.168.1.130
>that needs to talk to the main router, you type the following
>command on the sub-router:
>
>    arp -s 192.168.1.130 <sub-router's MAC address> pub


I tried but directly modifing arp-table overlap arp entry of the 'other
side' of the gateway,so i need
something 'interface oriented'.

>
>(The sub-router's MAC address can be gotten from an `ifconfig -a'
>or `netstat -i'; it will be a sequence of six hex numbers separated
>by colons, such as `8:0:20:1f:77:e0'.)
>
>The unfortunate part about this is that you have to add a separate
>arp entry for each host you want to proxy-arp for. On a cisco
>router, the proxy-arp option allows you to arp for anything it
>knows how to route to. This feature wouldn't be too hard to add to
>NetBSD, actually; you'd just have to modify arplookup to generate
>and add a new (pub, temp) arp entry for any IP address it can find
>a route for in its routing tables. (This would be controlled by a
>sysctl that would default to off, of course.) I may look at doing
>this after the 1.4 release. Or someone else could do it and save
>me the trouble. :-)
>
>cjs
>--
>Curt Sampson  <cjs@cynic.net>   604 801 5335   De gustibus, aut bene aut
nihil.
>The most widely ported operating system in the world: http://www.netbsd.org
>
>
>
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