What does it mean: arp_rtrequest: bad gateway value

[Ruslan Ermilov]

On Wed, Jan 21, 2004 at 10:51:18AM +0300, Vasenin Alexander aka BlackSir wrote:
> Those messages sometimes appears in log. Maybe someone know where to find
> what it actually mean?
> 
> Jan 21 02:58:54 inet /kernel: arp_rtrequest: bad gateway value
> Jan 21 03:03:54 inet /kernel: arp_rtrequest: bad gateway value
> Jan 21 03:08:53 inet /kernel: arp_rtrequest: bad gateway value
> Jan 21 03:13:52 inet /kernel: arp_rtrequest: bad gateway value
> Jan 21 03:23:51 inet last message repeated 2 times
> Jan 21 03:33:48 inet last message repeated 2 times
> 
The ARP entries are stored in the routing table.  A valid ARP
entry has a link-type gateway address.  If your routing table
is misconfigured, it's possible that gateway will be something
else -- then the kernel whines.  An example.  Here's a valid
ARP entry, that can also be viewed in less verbose form by arp(8):

: # route -vn get -host 192.168.0.66
: u: inet 192.168.0.66; u: link ; RTM_GET: Report Metrics: len 164, pid: 0, seq 1, errno 0, flags:<UP,GATEWAY,HOST,STATIC>
: locks:  inits:
: sockaddrs: <DST,IFP>
:  192.168.0.66
:    route to: 192.168.0.66
: destination: 192.168.0.66
:   interface: dc0
:       flags: <UP,HOST,DONE,LLINFO,WASCLONED>
:  recvpipe  sendpipe  ssthresh  rtt,msec    rttvar  hopcount      mtu     expire
:        0         0         0         0         0         0      1500      1067
: 
: locks:  inits:
: sockaddrs: <DST,GATEWAY,IFP,IFA>
:  192.168.0.66 0.2.2d.1a.6d.df dc0:0.10.a4.c0.c0.45 192.168.0.90

The gateway is 0.2.2d.1a.6d.df, of type AF_LINK.  Now I attempt to
change it to something else:

: # route change -host 192.168.0.66 1.2.3.4
: change host 192.168.0.66: gateway 1.2.3.4

Results in the following from the kernel:

: arp_rtrequest: bad gateway 192.168.0.66 (!AF_LINK)

This is on 5.2-CURRENT, the message is slightly more informative here.


Cheers,
-- 
Ruslan Ermilov
FreeBSD committer
ru at FreeBSD.org
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