Re: arplookup 192.168.1.254 failed: host is not on local network

From: Lowell Gilbert (freebsd-questions-local_at_be-well.ilk.org)
Date: 03/01/05

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    To: Mark Edwards <mark@antsclimbtree.com>
Date: 01 Mar 2005 15:53:32 -0500

    Mark Edwards <mark@antsclimbtree.com> writes:

    > On Mar 1, 2005, at 11:21 AM, Lowell Gilbert wrote:
    >
    > > Mark Edwards <mark@antsclimbtree.com> writes:
    > >
    > >> I've just put my server on a new connection that requires DHCP, even
    > >> for a fixed IP. Anyway, the DHCP server gives a fixed public internet
    > >> IP to my server, but it communicates on 192.168.1.254, which angers
    > >> FreeBSD (4.11). I get a lot of the following:
    > >>
    > >> arplookup 192.168.1.254 failed: host is not on local network
    > >>
    > >> Which makes sense, because as far as FreeBSD is concerned, interface
    > >> ep1 is on the internet not on a LAN.
    > >
    > > Exactly.
    > >
    > >> Looking on the net, I found the following suggestion, which does cure
    > >> the errors:
    > >>
    > >> /sbin/route add -net 192.168.1.254 -netmask 255.255.255.0 -interface 1
    > >>
    > >> My question is, is that the proper way to deal with this?
    > >
    > > It's not bad. I would use -host instead of -net and -netmask, and it
    > > will fail if the DHCP server ever changes its address, but what you
    > > are doing is is working and fairly likely to stay that way.
    >
    > How would you phrase the command? I just tried -host and couldn't get
    > it to work.

    e.g.,
    route add -host 172.10.212.2 -interface bge0

    > >> I have to
    > >> issue this statement whenever the dhclient is restarted. I've
    > >> currently placed it in my firewall script, but is there a proper or
    > >> more elegant way to achieve this?
    > >
    > > If you want something more elegant, you could specify a script for one
    > > of the dhclient-script(8) hooks, and put the route in there. You
    > > would be able to refer to the interface and server address by
    > > variables which dhclient-script provides...
    >
    > Great! I put the command in /etc/dhclient-exit-hooks and it works
    > great on a reboot. I don't really see which variables I can use in
    > the dhclient-script man page though. Do you know which variables
    > would do this?

    $interface
    $new_ip_address
    I can't seem to find anywhere that the server address is passed along, though. 

    -- 
Lowell Gilbert, embedded/networking software engineer, Boston area
		http://be-well.ilk.org/~lowell/
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