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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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