Understanding Flags, Refs, Use, Expire in Routing Table

Kevin Oberman oberman at es.net
Fri Mar 28 09:48:31 PDT 2008

> From: Robert Jesacher <jessy at sicha.net>
> Date: Fri, 28 Mar 2008 16:39:31 +0100
> Sender: owner-freebsd-net at freebsd.org
> Hi Daniel,
> you find mostl of you questions answered in "man netstat" (the  
> relevant passage is posted below)
> The missing part is the expiry, which IMHO are the seconds, the ARP  
> entry is valid (after this time a new arp request would be issued)
> I hope this is the information you needed.

It makes following a thread really hard. It's all (mostly) Microsoft's fault!
> Why?
> > I wish people would stop top-posting!

The Expire entry is the result of FreeBSD's unfortunate co-mingling
network layer routing information with layer 2 ARP information. The only
entries with "Expire" values are actually ARP entries. (Note the MAC
address os "Gateway".)

Expire is in seconds remaining until the entry expires and is no longer
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at es.net			Phone: +1 510 486-8634
Key fingerprint:059B 2DDF 031C 9BA3 14A4  EADA 927D EBB3 987B 3751
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