ipv6 host routes

[Julien Abeillé]

Hi John,

I use v6 hosts routes on FreeBSD 4.11. The main purpose for me is through ipv6 in ipv6 tunnels, so it is different.

I tried to install host routes as you do: 
In your case rtr2 and rtrg seem to be on the same prefix. In this case the prefix route is enough, but if you want to add a host route, indeed the route command does not work:

If i do not add a host route, but use the prefix route, the machine sending traffic (rtrg) will make a neighbor sollicitation, then get a neighbor adv, and add the entry in the routing table with the correct interface and the correct gateway MAC address (rtr2 MAC address).
If i add a host route, I have the same entry excepty that the gateway MAC address is my MAC address (rtrg)

To solve that, I do not add a route with route, but: add the v6 address of the destination in /etc/hosts,
then:
 ndp -s <hostname> <MAC address of the host>. Then the route is correctly added to the routing table.

I hope it works for you and you have the MAC address of the destination but still I find the behavior of the route command in this case strange.

Best regards,
Julien
 


----- Message d'origine ----
De : John Hay <jhay at meraka.org.za>
À : freebsd-net at freebsd.org
Cc : gnn at freebsd.org
Envoyé le : Jeudi, 7 Septembre 2006, 12h09mn 44s
Objet : Re: ipv6 host routes


Ok, I still have no joy adding an IPv6 route. Can anybody tell me what I
do wrong?

What I understand from the route(8) man page is that this command should
work:

route add -inet6 rtr2 rtrg -interface

Where rtr2 is the destination address and rtrg is my address on the
interface that rtr2 is connected to.

I have the following lines in my /etc/hosts file:
2001:4200:7000:15:202:6fff:fe22:9547    rtrg
2001:4200:7000:15:202:6fff:fe41:1927    rtr2

When I do the route add command the kernel prints this message:

nd6_rtrequest: bad gateway value: ath0

Ifconfig of the interface looks ok to me: 
ifconfig ath0
ath0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet6 fe80::202:6fff:fe22:9547%ath0 prefixlen 64 scopeid 0x3
        inet6 2001:4200:7000:15:202:6fff:fe22:9547 prefixlen 64
        inet6 2001:4200:7000:15:: prefixlen 64 anycast
        ether 00:02:6f:22:95:47
        media: IEEE 802.11 Wireless Ethernet autoselect <adhoc> (autoselect <adhoc>)
        status: associated
        ssid koppiemesh channel 149 bssid 02:02:6f:22:95:47
        authmode OPEN privacy OFF txpowmax 24 bmiss 7 burst bintval 100

After the route add, this new entry arrived in the routing table according
to:
netstat -rnf inet6
2001:4200:7000:15:202:6fff:fe41:1927 2001:4200:7000:15:202:6fff:fe22:9547 UHS
     ath0

I looked with ndp -a, but nothing was added there.

Anybody got any ideas? This is the last part of getting olsrd to work
properly on FreeBSD using IPv6.

John
-- 
John Hay -- John.Hay at meraka.csir.co.za / jhay at FreeBSD.org
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