Linux, FreeBSD, Juniper, Cisco / Network security articles and troubleshooting guides

IPv6 traffic is classified as “inet6” family in Junos routing operating system. The default routing table holding ipv6 routes is named [b]inet6.0[/b].

IPv4 default route is formed of four 0 octets with a zero mask: 0.0.0.0/0 or 0/0 in Junos. In the same manner, rhe IPv6 default route expressed as sixteen 0 octets expressed by a zero subnet mask. But all sixteen bytes can be compressed into two consecutive colons - ::/0.

[h2]Check IPv6 prefixes/routes in Junos[/h2]
[code]
admin@R1> show route table inet6.0

inet6.0: 13 destinations, 15 routes (13 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

2008:f234:ffff::1/128
*[Direct/0] 1w6d 03:54:29
> via lo0.0
2008:f234:ffff::ffff/128
*[Direct/0] 1w6d 03:54:29
> via lo0.0
…
[/code]
[h2]Check if ipv6 default route exists[/h2]
[code]
admin@R1> show route table inet6.0 ::/0 exact

admin@R1>[/code]
[h2]Configure IPv6 default route[/h2]
[code]
admin@R1> configure
Entering configuration mode

[edit]
admin@R1# set routing-options rib inet6.0 static route ::/0 next-hop 2008:f234:ffff::e:0

[edit]
admin@R1# commit
commit complete

[edit]
admin@R1# run show route table inet6.0 ::/0 exact

inet6.0: 14 destinations, 16 routes (14 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

::/0 *[Static/5] 00:00:03
> to 2008:f234:ffff::e:0 via ge-0/0/4.0[/code]
Same as IPv4 routes, IPv6 have three minimum arguments: prefix, mask and next hop. One thing to note is that IPV6 routes have to be defined in “rib inet6.0” under “routing-options”.