From mboxrd@z Thu Jan 1 00:00:00 1970 From: Naohiro Ooiwa Subject: ping6 is sent out from wrong interface Date: Fri, 20 Jun 2008 10:42:53 +0900 Message-ID: <485B0B1D.5000603@miraclelinux.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-2022-JP Content-Transfer-Encoding: 7bit Cc: =?ISO-2022-JP?B?WU9TSElGVUpJIEhpZGVha2kgLyAbJEI1SEYjMVFMQBsoQg==?= To: netdev@vger.kernel.org, usagi-users@linux-ipv6.org Return-path: Received: from ns.miraclelinux.com ([219.118.163.66]:29914 "EHLO mail.miraclelinux.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750897AbYFTCO5 (ORCPT ); Thu, 19 Jun 2008 22:14:57 -0400 Sender: netdev-owner@vger.kernel.org List-ID: Hi all, I configured the IPv6 global address for two interfaces, and sent the ping with "-I " to the "ff02::1". # ifconfig eth0 add 2001:2c0:418:1::2/64 # ifconfig eth1 add 2001:2c0:418:2::2/64 # ping6 -I2001:2c0:418:2::2 ff02::1 # /usr/sbin/tcpdump -ieth1 icmp6 -v -e tcpdump: listening on eth1, link-type EN10MB (Ethernet), capture size 96 bytes 0 packets captured 0 packets received by filter 0 packets dropped by kernel The ping packets weren't sent from "eth1", so I captured the packets on the "eth0" by tcpdump. # /usr/sbin/tcpdump -ieth0 icmp6 -v -e tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes 18:16:53.900751 00:19:d1:19:23:af (oui Unknown) > 33:33:00:00:00:01 (oui Unknown), ethertype IPv6 (0x86dd), length 118: (hlim 64, next-header: ICMPv6 (58), length: 64) 2001:2c0:418:2::2 > ff02::1: ICMP6, echo request, length 64, seq 190 18:16:53.957145 00:1d:09:7a:91:19 (oui Unknown) > 33:33:00:00:00:02 (oui Unknown), ethertype IPv6 (0x86dd), length 70: (hlim 255, next-header: ICMPv6 (58), length: 16) fe80::21d:9ff:fe7a:9119 > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 16 source link-address option (1), length 8 (1): 00:1d:09:7a:91:19 :::::: The ping packets were sent out from "eth0"(00:19:d1:19:23:af), but IPv6 address was "eth1"(2001:2c0:418:2::2). Why is interface "eth0". Isn't it bug ? The following is additional information. # ifconfig eth0 eth0 Link encap:Ethernet HWaddr 00:19:D1:19:23:AF inet addr:10.1.0.161 Bcast:10.1.255.255 Mask:255.255.0.0 inet6 addr: 2001:2c0:418:1::1/64 Scope:Global inet6 addr: fe80::219:d1ff:fe19:23af/64 Scope:Link :::::: # ifconfig eth1 eth1 Link encap:Ethernet HWaddr 00:10:18:0E:0C:B4 inet addr:172.16.255.200 Bcast:172.16.255.255 Mask:255.255.0.0 inet6 addr: 2001:2c0:418:2::2/64 Scope:Global inet6 addr: fe80::210:18ff:fe0e:cb4/64 Scope:Link :::::: # route -A inet6 Kernel IPv6 routing table Destination Next Hop Flags Metric Ref Use Iface 2001:2c0:418:1::/64 * U 256 0 0 eth0 2001:2c0:418:2::/64 * U 256 0 0 eth1 fe80::/64 * U 256 0 0 eth0 fe80::/64 * U 256 0 0 eth1 :::::: 2001:2c0:418:1::1/128 * U 0 8 1 lo 2001:2c0:418:2::2/128 * U 0 5 1 lo :::::: ff00::/8 * U 256 0 0 eth0 ff00::/8 * U 256 0 0 eth1 # The version used are following: # uname -r -m 2.6.24.7-92.fc8 i686 # ping6 -V ping6 utility, iputils-sss20070202 Regards, Naohiro Ooiwa