Date: Mon, 18 Jun 2012 18:03:34 -0300 From: H <hm@hm.net.br> To: freebsd-stable@freebsd.org Cc: sthaug@nethelp.no, Hans Petter Selasky <hselasky@c2i.net> Subject: Re: How to bind a route to a network adapter and not IP Message-ID: <201206181803.41211.hm@hm.net.br> In-Reply-To: <201206181754.15680.hselasky@c2i.net> References: <4FDB6AA3.3040606@gmail.com> <4FDE5393.5050808@hm.net.br> <201206181754.15680.hselasky@c2i.net>
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--nextPart1938882.UGr3QkiMLM Content-Type: Text/Plain; charset="iso-8859-15" Content-Transfer-Encoding: quoted-printable On Monday 18 June 2012 12:54 Hans Petter Selasky wrote: > On Monday 18 June 2012 00:00:51 H wrote: > > sthaug@nethelp.no wrote: > > >>> I loose packets because I use a WLAN adapter. Sometimes the link is > > >>> down for various reasons, and then the routes start changing for > > >>> manually created routes, and I want to prevent that. > > >>=20 > > >> well that is certainly not a reason for changing routes > > >>=20 > > >> I have the feeling you are not explaining good enough what really is > > >> going on and it may help sending your configurations and an example = of > > >> routes and IP addresses before and after this route change > > >=20 > > > Why is this so hard to understand? "Link down" leads to "static route > > > is deleted". This is standard FreeBSD behavior, and has been this way > > > for as long as I can remember (btw, I believe this behavior is from > > > the original BSD, not FreeBSD specific). > > >=20 > > > You can show this by having a static default route pointing to an > > > address on an Ethernet interface which has link. And then pulling the > > > TP cable from the Ethernet interface. Observe that the default route > > > is automatically removed. > >=20 > > may be you have not understood your own problem yet > >=20 > > because so far is nothing to be understood because none of your > > statements is correct, it is also not FreeBSD's standard behavior and > > never has been > >=20 > > as long as there is the valid IP address on the related interface, no > > static route will be deleted, you can even boot without cable and the > > [default] static route is there > >=20 > > so you need to explain better your problem in order to understand it > >=20 > > probably you have some other stuff running, thirdparty network manager > > or something, incorrect or incomplete ppoe or dhc configuration or > > whatever leads to the problem > >=20 > > FYI static routes usually are the manually configured routes, so what > > you say is redundant and not correct, I guess you're loosing some kind > > of dynamic route > >=20 > > since WL networks usually do not run RIP/OSPF/BGP I guess the route you > > apparently loose is coming from some dhcp server and may be your > > dhclient configuration is incomplete or none existent, but here now it > > would be useful to see your config >=20 > Hi, >=20 > I think we need to distinguish between two matters. One is where the route > is directly reachable on the local-net of the network adapter, and ARP is > valid/responding. The second case is when the route is not directly > reachable. The second case is where the problem happens, like Stian kindly > explained. >=20 > # For example: >=20 > ifconfig wlan0 10.0.0.2 255.255.255.0 up >=20 > # Assume the router is at 10.0.0.1 > # And we want to reach a certain destination through 10.0.0.1 > # Then we do: >=20 > route add 10.22.1.1 10.0.0.1 >=20 no no no my friend, wrong again that is a static route and it goes away same way it was created, manually o= r=20 by deleting the IP address 10.0.0.2 from the related interface wether there is or not an active link on that interface does not matter Hans > # > # First the FreeBSD network stack will resolve the ethernet address for > # 10.0.0.1, and all 10.22.1.1 IP packets will get sent to 10.0.0.1. > # >=20 > However, if the wlan0 link goes down, which sometimes happen, then the > route for 10.22.1.1 is deleted. This is sometimes very annoying, and also, > if it happens that the 10.22.1.1 is reachable from another network > adapter, then traffic sometimes can end up mis-routed. >=20 > --HPS > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" =2D-=20 HM +55 17 8111.3300 --nextPart1938882.UGr3QkiMLM Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) iEYEABECAAYFAk/fl60ACgkQvKVfg5xjCDzK5gCglEFRfc7RqFVXk4SBDEeipJds DqsAn2oNl2zn9XG78Cn5LkMOkv0UTb5I =WuSW -----END PGP SIGNATURE----- --nextPart1938882.UGr3QkiMLM--
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