cannot delete IPv6 default gateway

Posted by NulledPointer on Ask Ubuntu See other posts from Ask Ubuntu or by NulledPointer
Published on 2012-10-11T01:18:25Z Indexed on 2012/10/11 3:52 UTC
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The commands below should be pretty self-explanatory. Please note that the route for which i get failure is obtained by RA and has very less expiry ( e Flag in UDAe).

 @vm:~$ ip -6 route 
 2001:4860:4001:800::1002 via fe80::20c:29ff:fe87:f9e7 dev eth1  proto static  metric 1024
 2001:4860:4001:800::1003 via fe80::20c:29ff:fe87:f9e7 dev eth1  proto static  metric 1024
 2001:4860:4001:800::1005 via fe80::20c:29ff:fe87:f9e7 dev eth1  proto static  metric 1024
 2001:4860:4001:803::100e via fe80::20c:29ff:fe87:f9e7 dev eth1  proto static  metric 1024
 fd00:ffff:ffff:fff1::/64 dev eth1  proto kernel  metric 256  expires 2592300sec
 fe80::/64 dev eth1  proto kernel  metric 256
 default via fe80::20c:29ff:fe87:f9e7 dev eth1  proto static  metric 1
 default via fe80::20c:29ff:fe87:f9e7 dev eth1  proto kernel  metric 1024  expires 1776sec
 @vm:~$
 @vm:~$
 @vm:~$
 @vm:~$ sudo route -6 delete default gw fe80::20c:29ff:fe87:f9e7
 @vm:~$ ip -6 route
 2001:4860:4001:800::1002 via fe80::20c:29ff:fe87:f9e7 dev eth1  proto static  metric 1024
 2001:4860:4001:800::1003 via fe80::20c:29ff:fe87:f9e7 dev eth1  proto static  metric 1024
 2001:4860:4001:800::1005 via fe80::20c:29ff:fe87:f9e7 dev eth1  proto static  metric 1024
 2001:4860:4001:803::100e via fe80::20c:29ff:fe87:f9e7 dev eth1  proto static  metric 1024
 fd00:ffff:ffff:fff1::/64 dev eth1  proto kernel  metric 256  expires 2592279sec
 fe80::/64 dev eth1  proto kernel  metric 256
 default via fe80::20c:29ff:fe87:f9e7 dev eth1  proto kernel  metric 1024  expires 1755sec
 @vm:~$
 @vm:~$
 @vm:~$ sudo route -6 delete ::/0 gw fe80::20c:29ff:fe87:f9e7 dev eth1
 SIOCDELRT: No such process
 @vm:~$
 @vm:~$
 @vm:~$ route -n6
 Kernel IPv6 routing table
 Destination                    Next Hop                   Flag Met Ref Use If
 2001:4860:4001:800::1002/128   fe80::20c:29ff:fe87:f9e7   UG   1024 0     0 eth1
 2001:4860:4001:800::1003/128   fe80::20c:29ff:fe87:f9e7   UG   1024 0     0 eth1
 2001:4860:4001:800::1005/128   fe80::20c:29ff:fe87:f9e7   UG   1024 0     0 eth1
 2001:4860:4001:803::100e/128   fe80::20c:29ff:fe87:f9e7   UG   1024 0     0 eth1
 fd00:ffff:ffff:fff1::/64       ::                         UAe  256 0     0 eth1
 fe80::/64                      ::                         U    256 0     0 eth1
 ::/0                           fe80::20c:29ff:fe87:f9e7   UGDAe 1024 0     0 eth1
 ::/0                           ::                         !n   -1  1   349 lo
 ::1/128                        ::                         Un   0   1     3 lo
 fd00:ffff:ffff:fff1:a00:27ff:fe7f:7245/128 ::                         Un   0   1     0 lo
 fd00:ffff:ffff:fff1:fce8:ce07:b9ea:389f/128 ::                         Un   0   1     0 lo
 fe80::a00:27ff:fe7f:7245/128   ::                         Un   0   1     0 lo
 ff00::/8                       ::                         U    256 0     0 eth1
 ::/0                           ::                         !n   -1  1   349 lo
 @vm:~$

UPDATE: Another question is whats the use of link local address as the default route?

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