Date: Sat, 28 Jun 2008 15:40:15 -0700 From: Julian Elischer <julian@elischer.org> To: serg vasilyev <sergv326@gmail.com> Cc: freebsd-net@freebsd.org Subject: Re: setfib with mpd - ifconfig on p-t-p link trouble Message-ID: <4866BDCF.3020907@elischer.org> In-Reply-To: <4866B8BB.1040908@elischer.org> References: <fd45a1f90806280748u30e2acc9w11bae196a812222b@mail.gmail.com> <4866B8BB.1040908@elischer.org>
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Julian Elischer wrote: > serg vasilyev wrote: >> Hi ! >> there's must be a restriction in ifconfig or in kernel that preventing >> from >> adding a multiple p-t-p interface with same destination address. >> i'm trying to build a test system with setfib and multiple mpd instances >> which are creating PPPoE connection to same destination gateway and >> run into >> problem with second p-t-p interface. >> mpd did not add an IP and gateway for it > > > this is a misunderstanding of what setfib does. > You can only have one point to poitn interface with the same > destination address. > Having multiple routing tables does not automatically make it > possible to have tow tunnels to the same place, > (though theoretically maultipath routing might make this possible) > because you still need to specify the remote address to specify > the route's action. If you have multiple p2p links with the same > remote address, you cannot specify which interface to use for a > particular route. > > >> >> setfib 1 mpd1 -p /tmp/mpd1.pid -f mpd1.conf >> sleep 2 >> setfib 2 mpd2 -p /tmp/mpd2.pid -f mpd2.conf >> >> on a first interface ng0 i have both src ip and dst ip but on second i >> have >> nothing >> >> # ifconfig ng0 >> ng0: flags=88d1<UP,POINTOPOINT,RUNNING,NOARP,SIMPLEX,MULTICAST> mtu 1492 >> inet x.x.x.x --> y.y.y.y netmask 0xffffffff >> # ifconfig ng1 >> ng1: flags=88d1<UP,POINTOPOINT,RUNNING,NOARP,SIMPLEX,MULTICAST> mtu 1492 >> >> when i try to add ip's personally >> # ifconfig ng1 z.z.z.z y.y.y.y >> ifconfig: ioctl (SIOCAIFADDR) File exist >> >> How to remove the given restriction on an ifconfig or kernel or >> something >> else >> P.S. Sorry for my english... > you MAY be able to manually remove the link addresses from both > routing tables after adding the first p2p link, > and then add the second interface, and then > remove the link address from the first fib, > and add back the first link route from the first p3p link to teh first FIB. > > but I have not tested this. > > currently, adding an interface addres teh link layer route to ALL fibs, > leaving it up to the admin to remove them from the fibs he does > not want them in. This was a decision I took but the other option would > have been to add it to only the 'current' fib, which would have > been even more disruptive. > > ok I tested this with gre tunnels: > > ifconfig gre0 create > ifconfig gre1 create > ifconfig gre0 1.1.1.1 2.2.2.2 > # remove conflicting routes > setfib -0 route delete 2.2.2.2 > setfib -1 route delete 2.2.2.2 > #now set up the second link > ifconfig gre1 3.3.3.3 2.2.2.2 > # and remove the rotue we don't want > setfib -0 route delete 2.2.2.2 > # and replace it with the one we DO want, > # (or one that is equivalent) > setfib -0 route add 2.2.2.2 -iface gre0 > > > wsa05:rjulian 34] ifconfig > [...] > gre0: flags=9011<UP,POINTOPOINT,LINK0,MULTICAST> mtu 1476 > inet 1.1.1.1 --> 2.2.2.2 netmask 0xff000000 > gre1: flags=9011<UP,POINTOPOINT,LINK0,MULTICAST> mtu 1476 > inet 3.3.3.3 --> 2.2.2.2 netmask 0xff000000 > > > wsa05:rjulian 35] setfib -0 netstat -rn > Routing tables > > Internet: > Destination Gateway Flags Refs Use Netif > [...] > 2.2.2.2 3.3.3.3 UH 0 0 gre1 > [...] > wsa05:rjulian 36] setfib -1 netstat -rn > Routing tables > > Internet: > Destination Gateway Flags Refs Use Netif > [...] > 2.2.2.2 gre0 UGHS 0 0 gre0 > [...] > wsa05:rjulian 37] > > which would do what you want. > now to make mpd know how to do that :-) actually setfib -1 route add 2.2.2.2 -iface gre0 -gateway 1.1.1.1 seems to do even better .. wsa05:rjulian 6] setfib -1 route add 2.2.2.2 -interface gre0 -gateway 1.1.1.1 add host 2.2.2.2: gateway gre0 wsa05:rjulian 7] setfib -1 netstat -rn Routing tables Internet: Destination Gateway Flags Refs Use Netif [...] 2.2.2.2 1.1.1.1 UHS 0 0 gre0 [...] wsa05:rjulian 8] > > >> _______________________________________________ >> freebsd-net@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-net >> To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" > > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"
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