Default gateway on different net

Hiroki Sato hrs at
Thu Sep 23 15:44:49 UTC 2010

Lasse Brandt <lasse at> wrote
  in <6BE964C4-0838-4DA6-9278-12C620CA1EE1 at>:

la> 1) Is the hosting provider actually forcing me to do something "bad"
la> og plain wrong?

 In that situation normally you get an IP address in the /59 network
 to communicate with the gateway router from ISP.  An IP address in
 your /64 network cannot directly communicate with an address in /59.

 If you do not have the /59 address, I think using link-local address
 is the easiest way.  As long as the gateway works correctly, you can
 get its link-local address by using the following command:

 % ping6 ff02::2%re0
 PING6(56=40+8+8 bytes) fe80::XXXX:XXXX:XXXX:XXXX%re0 --> ff02::2%re0
 16 bytes from fe80::YYYY:YYYY:YYYY:YYYY%re0, icmp_seq=0 hlim=64 time=0.525 ms
 16 bytes from fe80::YYYY:YYYY:YYYY:YYYY%re0, icmp_seq=1 hlim=64 time=0.312 ms

 Note that "XXXX:.." is your address on re0, and "YYYY:.." is the
 gateway's.  You do not need any configuration like assigning
 2a01:... address into re0 or static routes before performing this
 ping.  At least one router replies to this and displays its link-local

 After that, you can add the default route to it:

 # route add -inet6 default fe80::YYYY:YYYY:YYYY:YYYY%re0

 and configure your /64 address (2a01:...) to re0.

-- Hiroki
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