Re: arp error
From: jpd (read_the_sig_at_do.not.spam.it)
Date: 03/02/04
- Previous message: jpd: "Re: Local DNS config"
- In reply to: Fred: "arp error"
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Date: Tue, 2 Mar 2004 15:56:30 +0000 (UTC)
In article <10497msfno68a5e@corp.supernews.com>, Fred wrote:
> I run FreeBSD 4.9, which serves as a NAT gateway, and as a local dns and
> mail server. Two weeks ago, my ISP did some work on their system, and since
> then I have been getting the following error message:
>
> /kernel: arp: 1.2.3.4 moved from 00:02:4b:4c:40:00 to 00:02:4b:4c:40:01 on
> rl1
And another that moves it back to the old one, yes?
If not, what is your securelevel set to? (Or are there other options that
lock down the arp cache, anyone? Can't think of any right now, but ICBW.)
> Everything on the box works fine... I've looked and looked and cannot find
> where FreeBSD is storing the mac address of the old router. How do I get rid
> of this error? Its probably something simple.
arp -a shows you what it has stored. man arp will explain the other
options, including how to delete entries.
> One other thing of note: I have ICMP blocked with my firewall.... would
> unblocking it help?
No. Blocking all ICMP does cause other faillures though. While there are
a few ICMP messages that have lost their value or have been abused too
often to still be useful, there are quite some that are pretty vital for
a properly working IP setup. Blocking the remainder is often just
(misguided) paranoia. If you don't know the first thing about
networking, it's best to leave ICMP alone.
-- j p d (at) d s b (dot) t u d e l f t (dot) n l .
- Previous message: jpd: "Re: Local DNS config"
- In reply to: Fred: "arp error"
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