From mboxrd@z Thu Jan 1 00:00:00 1970 From: Liang Qin Subject: cannot always delete IPv6 route entry in Fedora core 2 and Core 3 Date: Tue, 23 Nov 2004 10:36:02 -0500 Message-ID: <41A358E2.8090909@sce.carleton.ca> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: To: netdev@oss.sgi.com Sender: netdev-bounce@oss.sgi.com Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org 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