Date: Sun, 19 Feb 2006 15:14:35 +0000 From: Josef Karthauser <joe@tao.org.uk> To: net@freebsd.org Subject: Default gateway - wrong interface. ! Message-ID: <20060219151435.GE15477@genius.tao.org.uk>
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Hey guys,
I'm guessing that this is a bug (or feature!).
I've got a machine with a wlan interface (iwi0), with an ipv4 network
address and a default gateway. I also have an ethernet card in the same
machine (em0) with the same IP address. The idea is that I can bring
the wireless down, and the wired interface up to get fast transfers when
approriate, and be wireless the rest of the time.
That works fine, apart from the default gateway:
# ifconfig iwi0 down
# ifconfig em0 up
# arp -ad
# netstat -rn
Internet:
Destination Gateway Flags Refs Use Netif
Expire
default 87.74.4.33 UGS 0 123 iwi0
87.74.4.32/27 link#3 UC 0 0 em0
87.74.4.33 00:90:d0:02:3f:16 UHLW 2 1 em0
87.74.4.34 00:d0:b7:88:c8:20 UHLW 1 1191414 em0
127.0.0.1 127.0.0.1 UH 0 2 lo0
Notice, the local subnet is off the em0, but the default route is still
wired off the iwi0.
# route delete default
# route add default 87.74.4.33
# netstat -rn
Internet:
Destination Gateway Flags Refs Use Netif
Expire
default 87.74.4.33 UGS 0 123 iwi0
87.74.4.32/27 link#3 UC 0 0 em0
87.74.4.33 00:90:d0:02:3f:16 UHLW 2 1 em0
87.74.4.34 00:d0:b7:88:c8:20 UHLW 1 1191414 em0
127.0.0.1 127.0.0.1 UH 0 2 lo0
The default route is _still_ off iwi0; but should be off em0.
There's obviously something dumb doing on here. Why does the default
route have to be nailed to an interface? It's clear that 87.74.4.33 is
available from em0 as far as the routing table is concerned.
Joe
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