Re: What provides default router via DHCP?

Begin <xoavirt23kl9.fsf@xxxxxxx>
On 2006-01-02, James Carlson <james.d.carlson@xxxxxxx> wrote:
>
> It's also an unnecessary protocol, because, as you rightly note, the
> same thing can be done better using RIP.

Provided you run RIP (or RIPv2 or OSPF or whatever) and want your hosts
to speak it, or at least listen to it, too. I'd not be too happy to do
that. I'd also note that IPv6 has a similar router discovery mechanism.


> (Unfortunately, if you run DHCP as a client on Solaris and the DHCP
> server supplies a default router address, the system automatically
> disables in.routed, on the "assumption" that the DHCP server knows
> best. Why exactly a DHCP server would know more about routing than a
> RIP router is a subject for another time.)

Not about routing, per-se. If you run the dhcp client you are presumably
running a dynamic host box which presumably needs a default router, not
a routing daemon. This is mostly inferrence from what you say above,
and not a comment on the wisdom of the policy.

Somewhere upthread it was mentioned that the solaris recommended default
was to use rdisc and forego dhcp default router distribution. I am not
aware of many shops doing this so I'm not too clear on the why of the
recommendation.


I personally would setup a dhcpd and use that, and not run routing
protocols in network leaves at all. I haven't found a need to run rdisc,
spoiled as I am with dhcpd. I do prefer to keep the number of services
I need to run the network down a bit, so if I can drop rdisc or routed
because dhcpd can distribute default routes too, I tend to prefer that.
If I needed to provide for default router fail-over I'd probably look
into doing it through ARP tricks and between-router synchronisation, as
multiple-default router support is in solaris but not much else that I
am aware of.


--
j p d (at) d s b (dot) t u d e l f t (dot) n l .
This message was originally posted on Usenet in plain text.
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