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(usagi-users 03153) cannot always delete IPv6 route entry in Fedora core 2 and Core 3
- To: usagi-users@xxxxxxxxxxxxxx
- Subject: (usagi-users 03153) cannot always delete IPv6 route entry in Fedora core 2 and Core 3
- From: Liang Qin <lqin@xxxxxxxxxxxxxxx>
- Date: Wed, 01 Dec 2004 14:58:28 -0500
- Reply-to: usagi-users@xxxxxxxxxxxxxx
- Resent-date: Thu, 2 Dec 2004 12:23:26 +0900
- Resent-from: sekiya@xxxxxxxxxxxxxx
- Resent-message-id: <200412021223.FMLAAB10466.usagi-users@linux-ipv6.org>
- Resent-to: usagi-users@xxxxxxxxxxxxxx (moderated)
- User-agent: Mozilla Thunderbird 0.9 (X11/20041103)
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).
BTW, I've sent the same question to netdev@xxxxxxxxxxx but don't
receive reply.
Thanks in advance!
Liang Qin