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From: Julian Elischer <julian@elischer.org>
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To: Alexander Motin <mav@FreeBSD.org>
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Cc: freebsd-net <freebsd-net@freebsd.org>
Subject: Re: Point-to-Point interfaces regressions
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Alexander Motin wrote:
> I have found few cases, that were working fine before, but not so good
> now on CURRENT.
> 
> There is two interfaces:
> bge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>         options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM>
>         ether 00:1b:24:c5:5b:09
>         inet 192.168.3.131 netmask 0xffffff00 broadcast 192.168.3.255
>         inet 10.0.0.1 netmask 0xffffff00 broadcast 10.0.0.255
>         media: Ethernet autoselect (100baseTX <full-duplex>)
>         status: active
> ng0: flags=88d1<UP,POINTOPOINT,RUNNING,NOARP,SIMPLEX,MULTICAST> metric 0
> mtu 1500
> 
> 1) I am going to reuse Ethernet address as local for PtP link:
> %ifconfig ng0 10.0.0.1 10.0.0.2
> ifconfig: ioctl (SIOCAIFADDR): File exists
> %ifconfig ng0
> ng0: flags=88d1<UP,POINTOPOINT,RUNNING,NOARP,SIMPLEX,MULTICAST> metric 0
> mtu 1500
>         inet 10.0.0.1 --> 10.0.0.2 netmask 0xff000000
> So as you can see, address was assigned, but request returned error
> status. Probably it is related to the recent local address route changes.

yes the new code adds a route to 'yourself' for the local end of p2p 
links. which collides with the route to the ethernet's own address (I 
think).

there is a sysctl to change this behaviour but I forget what it is.

I'm not sure I like the new behaviour.. Qing Li is the man to discuss 
this with,

> 
> 2) I am going to configure arp-proxy:
> %arp -s 10.0.0.2 00:1b:24:c5:5b:09 pub
> arp: writing to routing socket: Invalid argument
> And again it doesn't work, writing to syslog:
> kernel: lla_rt_output: RTM_ADD publish (proxy only) is invalid
>