[FROG] disc0 interface in FreeBSD 12.x
mike tancsa
mike at sentex.net
Thu Oct 1 15:41:17 UTC 2020
What is the preferred syntax going forward ? I just want to tie down
larger prefixes to the discard interface so any packets sent to dead
space just get discarded. I dont want icmp messages sent back.
ip route 10.0.0.0/8 disc0 ?
Also, if the old syntax is not going to work, perhaps not allow it in
the config ?
---Mike
On 10/1/2020 11:31 AM, Stephen Worley wrote:
> this was disallowed starting
> with https://github.com/FRRouting/frr/pull/4302
>
> If you have a valid use case might be worth discussing with the author
> over slack.
>
> On Thu, Oct 1, 2020 at 9:33 AM mike tancsa <mike at sentex.net
> <mailto:mike at sentex.net>> wrote:
>
> Hi Donald, the 10.128.128.144 is the disc0 interface on my production
> router running frr6 and it works as expected. I setup another test box
> with frr6 and used the same disc0 ip config
>
>
> e.g. on frr6
>
> # ifconfig disc0
> disc0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 65532
> inet 10.128.128.1 netmask 0xfffffffc
> groups: disc
> nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
>
> frr6# sh ip route connected
> Codes: K - kernel route, C - connected, S - static, R - RIP,
> O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
> T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
> F - PBR,
> > - selected route, * - FIB route
>
> C>* 10.128.128.0/30 <http://10.128.128.0/30> is directly
> connected, disc0, 00:00:19
>
> frr6# sh ip route 10.128.128.1
> Routing entry for 10.128.128.0/30 <http://10.128.128.0/30>
> Known via "connected", distance 0, metric 1, best
> Last update 00:00:42 ago
> * directly connected, disc0
>
> frr6# conf t
> frr6(config)# ip route 10.0.0.0/8 <http://10.0.0.0/8> 10.128.128.1
> frr6(config)# ^Z
> frr6# sh ip route 10.0.0.0/8 <http://10.0.0.0/8>
> Routing entry for 10.0.0.0/8 <http://10.0.0.0/8>
> Known via "static", distance 1, metric 0, best
> Last update 00:00:06 ago
> * 10.128.128.1, via disc0
>
> frr6#
>
>
> on frr7
>
> frr7# sh ip route connected
> Codes: K - kernel route, C - connected, S - static, R - RIP,
> O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
> T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
> F - PBR, f - OpenFabric,
> > - selected route, * - FIB route, q - queued route, r -
> rejected
> route
>
> C>* 10.128.128.0/30 <http://10.128.128.0/30> [0/1] is directly
> connected, disc0, 00:24:49
>
> frr7# sh ip route 10.128.128.1
> Routing entry for 10.128.128.0/30 <http://10.128.128.0/30>
> Known via "connected", distance 0, metric 1, best
> Last update 00:25:07 ago
> * directly connected, disc0
>
> frr7# conf t
> frr7(config)# ip route 10.0.0.0/8 <http://10.0.0.0/8> 10.128.128.1
> % Warning!! Local connected address is configured as Gateway
> IP(10.128.128.1)
>
> frr7# sh ip route 10.0.0.0/8 <http://10.0.0.0/8>
> % Network not in table
> frr7#
>
> ---Mike
>
>
>
> On 10/1/2020 8:00 AM, Donald Sharp wrote:
> > Can we see the output of `show ip route 10.128.128.144` and `show ip
> > route connected`?
> >
> > donald
> >
> > On Wed, Sep 30, 2020 at 3:03 PM mike tancsa <mike at sentex.net
> <mailto:mike at sentex.net>> wrote:
> >> Up to version 6.x of frr, I have been able to tie down larger
> prefixes
> >> with a static routing pointing to the discard interface on FreeBSD.
> >>
> >> eg. the static route entry
> >>
> >> ip route 10.0.0.0/8 <http://10.0.0.0/8> 10.128.128.144
> >>
> >> # sh ip route 10.0.0.0/8 <http://10.0.0.0/8>
> >> Routing entry for 10.0.0.0/8 <http://10.0.0.0/8>
> >> Known via "static", distance 1, metric 0, best
> >> Last update 09w0d01h ago
> >> * 10.128.128.144, via disc0
> >>
> >> where disc0 is
> >>
> >> # ifconfig disc0
> >> disc0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 65532
> >> inet 10.128.128.144 netmask 0xfffffffc
> >> inet6 fe80::1%disc0 prefixlen 64 scopeid 0x8
> >> inet6 2001:db8::1 prefixlen 64
> >> groups: disc
> >> nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
> >>
> >>
> >> however, on frr7.4 this no longer works,
> >>
> >> On my test box
> >>
> >> % ifconfig disc0
> >> disc0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 65532
> >> inet 10.128.128.1 netmask 0xfffffffc
> >> inet6 fe80::1%disc0 prefixlen 64 scopeid 0x6
> >> groups: disc
> >> nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
> >>
> >>
> >>
> >> i3# conf t
> >> i3(config)# ip route 10.0.0.0/8 <http://10.0.0.0/8> 10.128.128.1
> >> % Warning!! Local connected address is configured as Gateway
> >> IP(10.128.128.1)
> >> i3(config)#
> >>
> >> i3# sh ip route 10.0.0.0/8 <http://10.0.0.0/8>
> >> % Network not in table
> >> i3#
> >>
> >> If I user disc0, it seems to work, but I get warnings on start up
> >>
> >> i3(config)# ip route 10.0.0.0/8 <http://10.0.0.0/8> disc0
> >>
> >> i3# wr
> >> Note: this version of vtysh never writes vtysh.conf
> >> Building Configuration...
> >> Configuration saved to /usr/local/etc/frr/zebra.conf
> >> Configuration saved to /usr/local/etc/frr/bgpd.conf
> >> Configuration saved to /usr/local/etc/frr/staticd.conf
> >> i3# sh ip route 10.0.0.0/8 <http://10.0.0.0/8>
> >> Routing entry for 10.0.0.0/8 <http://10.0.0.0/8>
> >> Known via "static", distance 1, metric 0, best
> >> Last update 00:00:07 ago
> >> * directly connected, disc0, weight 1
> >>
> >> i3#
> >>
> >> 2020/09/30 14:57:53 STATIC: Static Route using disc0 interface not
> >> installed because the interface does not exist in specified vrf
> >> 2020/09/30 14:57:53 STATIC: Static Route using disc0 interface not
> >> installed because the interface does not exist in specified vrf
> >>
> >> the kernel routing table does seem to have it installed
> >>
> >>
> >> # netstat -nra | grep 10.0.0
> >> 10.0.0.0/8 <http://10.0.0.0/8> disc0 U1
> 0 65532 disc0
> >> #
> >>
> >> What is the "proper" way to do this on frr7x ?
> >>
> >> Thanks
> >>
> >> ---Mike
> >>
> >>
> >>
> >>
> >> _______________________________________________
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> >> frog at lists.frrouting.org <mailto:frog at lists.frrouting.org>
> >> https://lists.frrouting.org/listinfo/frog
>
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