* cannot always delete IPv6 route entry in Fedora core 2 and Core 3
@ 2004-11-23 15:36 Liang Qin
0 siblings, 0 replies; only message in thread
From: Liang Qin @ 2004-11-23 15:36 UTC (permalink / raw)
To: netdev
Hi there,
I'm a Ph. D student at Carleton University, Canada. I've developing
routing protocols
on Linux.
Recently when I move code from redhat 9.0 to Fedora Core 2 and 3, I
found out sometimes
the IPv6 route entry added previously cannot be deleted successfully.
Finally I traced down to
the system call to the kernel and did the following experiments:
[root@localhost lqin]# route -A inet6
Kernel IPv6 routing table
Destination Next
Hop Flags Metric Ref Use Iface
::1/128
* U 0 310 0 lo
fe80::206:25ff:fea9:b1f9/128
* U 0 0 0 lo
fe80::/64
* U 256 0 0 eth1
fec0::/128
fec0:: UC 0 18 0 eth1
fec0::206:25ff:fea9:b1f9/128
* U 0 21 0 lo
fec0::/64
* U 256 0 0 eth1
ff00::/128
ff00:: UC 0 15 0 eth1
ff00::/8
* U 256 0 0 eth1
*/0
* UD 256 0 0 eth1
*/0
* U 1024 0 0 eth1
[root@localhost lqin]# ip -6 route add fec0::206:25ff:fea9:b1fd/128 dev eth1
[root@localhost lqin]# netstat --inet6 -rn
Kernel IPv6 routing table
Destination Next
Hop Flags Metric Ref Use Iface
::1/128
:: U 0 343 0 lo
fe80::206:25ff:fea9:b1f9/128
:: U 0 0 0 lo
fe80::/64
:: U 256 0 0 eth1
fec0::206:25ff:fea9:b1f9/128
:: U 0 24 0 lo
fec0::206:25ff:fea9:b1fd/128
:: U 1024 0 0 eth1
fec0::/64
:: U 256 0 0 eth1
ff00::/8
:: U 256 0 0 eth1
fec0::/64
:: U 256 0 0 eth1
ff00::/8
:: U 256 0 0 eth1
::/0
:: UD 256 0 0 eth1
::/0
:: U 1024 0 0 eth1
::/0
:: U 1024 0 0 eth1
[root@localhost lqin]# ip -6 route del fec0::206:25ff:fea9:b1fd/128 dev eth1
[root@localhost lqin]# netstat --inet6 -rn
Kernel IPv6 routing table
Destination Next
Hop Flags Metric Ref Use Iface
::1/128
:: U 0 391 0 lo
fe80::206:25ff:fea9:b1f9/128
:: U 0 0 0 lo
fe80::/64
:: U 256 0 0 eth1
fec0::/128
fec0:: UC 0 6 0 eth1
fec0::206:25ff:fea9:b1f9/128
:: U 0 27 0 lo
fec0::206:25ff:fea9:b1fd/128
:: U 1024 0 0 eth1
fec0::/64
:: U 256 0 0 eth1
fec0::/64
:: U 256 0 0 eth1
ff00::/128
ff00:: UC 0 6 0 eth1
ff00::/8
:: U 256 0 0 eth1
::/0
:: UD 256 0 0 eth1
::/0
:: U 1024 0 0 eth1
It will be successfully if I use command twice in very short time (ine 1
or 2 seconds)
ip -6 route del fec0::206:25ff:fea9:b1fd/128 dev eth1
Here eth1 is a wireless interface
I tested on two Dell tops with Fedora core 2 and 3 with the same
problem, but on redhat 9.0,
there is no such problem at all (even with the routing protocol which I
work on).
Thanks in advance!
Liang Qin
Ottawa, Canada
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