Date: Tue, 26 Mar 2002 12:44:38 -0800 (PST) From: Archie Cobbs <archie@dellroad.org> To: "Cambria, Mike" <mcambria@avaya.com> Cc: "'Julian Elischer'" <julian@elischer.org>, "'Archie Cobbs'" <archie@dellroad.org>, "'freebsd-net@freebsd.org'" <freebsd-net@FreeBSD.ORG> Subject: Re: Unnumbered IP Interface Message-ID: <200203262044.g2QKicE37079@arch20m.dellroad.org> In-Reply-To: <3A6D367EA1EFD4118C9B00A0C9DD99D70655CE@rerun.avayactc.com> "from Cambria, Mike at Mar 26, 2002 09:59:40 am"
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Cambria, Mike writes:
> example, Archie's answer for unnumbered interfaces isn't in the route
> manpage. I'm glad I asked.
Quoting route(8):
"If the destination is directly reachable via an interface requiring no
intermediary system to act as a gateway, the -interface modifier should
be specified; the gateway given is the address of this host on the common
network, indicating the interface to be used for transmission. Alter-
nately, if the interface is point to point the name of the interface
itself may be given, in which case the route remains valid even if the
local or remote addresses change.
By the way, you can have an "unnumbered" P2P interface that still has
an IP address configured on it -- just configure the same IP address
that's on another interface, e.g.:
$ ifconfig
dc0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet 192.168.0.223 netmask 0xffffff00 broadcast 192.168.0.255
ether 00:a0:cc:d6:cc:b1
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
ng0: flags=88d1<UP,POINTOPOINT,RUNNING,NOARP,SIMPLEX,MULTICAST> mtu 1500
inet 192.168.0.223 --> 1.2.3.4 netmask 0xffffff00
This is sometimes known as "half-routing"..
-Archie
__________________________________________________________________________
Archie Cobbs * Packet Design * http://www.packetdesign.com
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