netdev - Re: source interface ping bug ?

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Date:	Sun, 29 Jul 2007 14:48:12 +0300
From:	"nano bug" <linnewbye@...il.com>
To:	netdev@...r.kernel.org
Subject: Re: source interface ping bug ?

Any news about this ?

On 7/27/07, nano bug <linnewbye@...il.com> wrote:
> Hello there,
>
> I'm facing the following issue : when I try to ping using source
> interface instead of a source ip address the ping utility starts to
> send arp requests instead of icmp requests though the ip address I'm
> pinging it's not in the subnets directly connected to my linux box.
> I've noticed this situation since I upgraded from kernel 2.6.20 to
> 2.6.21. On 2.6.20 and lower I haven't had this problem. Now I upgraded
> to 2.6.22 but it's the same. I'm using latest iproute and iputils.
> Here is an output of tcpdump when I try to ping an outside ip address,
> like for example www.yahoo.com, using source interface :
>
> root@...kstar:~# uname -a
> Linux darkstar 2.6.22 #1 Thu Jul 26 21:22:11 EEST 2007 i686 Pentium II
> (Deschutes) GenuineIntel GNU/Linux
>
> root@...kstar:~# ip -V
> ip utility, iproute2-ss070710
> root@...kstar:~#
>
>
> root@...kstar:~# ip address show dev eth2
> 3: eth2: <BROADCAST,MULTICAST,NOTRAILERS,UP,LOWER_UP> mtu 1500 qdisc
> pfifo_fast qlen 1000
>    link/ether 00:90:27:0f:79:f3 brd ff:ff:ff:ff:ff:ff
>    inet 86.106.19.75/23 brd 86.106.19.255 scope global eth2
> root@...kstar:~# ip route get 87.248.113.14 from 86.106.19.75 oif eth2
> 87.248.113.14 from 86.106.19.75 via 86.106.18.1 dev eth2
>    cache  mtu 1500 advmss 1460 hoplimit 64
> root@...kstar:~#
>
>
> root@...kstar:~/iputils# ./ping -V
> ping utility, iputils-sss20070202
> root@...kstar:~/iputils# ./ping -I 86.106.19.75 87.248.113.14 -c 2
> PING 87.248.113.14 (87.248.113.14) from 86.106.19.75 : 56(84) bytes of data.
> 64 bytes from 87.248.113.14: icmp_seq=1 ttl=51 time=60.5 ms
> 64 bytes from 87.248.113.14: icmp_seq=2 ttl=51 time=63.2 ms
>
> --- 87.248.113.14 ping statistics ---
> 2 packets transmitted, 2 received, 0% packet loss, time 999ms
> rtt min/avg/max/mdev = 60.574/61.924/63.274/1.350 ms
> root@...kstar:~/iputils#
>
>
> root@...kstar:~# tcpdump -i eth2 -vvv -n host 87.248.113.14 and host
> 86.106.19.75
> tcpdump: listening on eth2, link-type EN10MB (Ethernet), capture size 96 bytes
> 01:18:09.572603 IP (tos 0x0, ttl  64, id 0, offset 0, flags [DF],
> proto: ICMP (1), length: 84) 86.106.19.75 > 87.248.113.14: ICMP echo
> request, id 27166, seq 1, length 64
> 01:18:09.632861 IP (tos 0x0, ttl  51, id 6100, offset 0, flags [none],
> proto: ICMP (1), length: 84) 87.248.113.14 > 86.106.19.75: ICMP echo
> reply, id 27166, seq 1, length 64
> 01:18:10.572746 IP (tos 0x0, ttl  64, id 0, offset 0, flags [DF],
> proto: ICMP (1), length: 84) 86.106.19.75 > 87.248.113.14: ICMP echo
> request, id 27166, seq 2, length 64
> 01:18:10.634951 IP (tos 0x0, ttl  51, id 8790, offset 0, flags [none],
> proto: ICMP (1), length: 84) 87.248.113.14 > 86.106.19.75: ICMP echo
> reply, id 27166, seq 2, length 64
>
>
>
> using source interface :
>
> root@...kstar:~/iputils# ./ping -I eth2 87.248.113.14
> PING 87.248.113.14 (87.248.113.14) from 86.106.19.75 eth2: 56(84) bytes of data.
> From 86.106.19.75 icmp_seq=1 Destination Host Unreachable
> From 86.106.19.75 icmp_seq=2 Destination Host Unreachable
> From 86.106.19.75 icmp_seq=3 Destination Host Unreachable
> From 86.106.19.75 icmp_seq=5 Destination Host Unreachable
> From 86.106.19.75 icmp_seq=6 Destination Host Unreachable
> From 86.106.19.75 icmp_seq=7 Destination Host Unreachable
> From 86.106.19.75 icmp_seq=9 Destination Host Unreachable
> From 86.106.19.75 icmp_seq=10 Destination Host Unreachable
> From 86.106.19.75 icmp_seq=11 Destination Host Unreachable
>
> --- 87.248.113.14 ping statistics ---
> 13 packets transmitted, 0 received, +9 errors, 100% packet loss, time 12006ms
> , pipe 3
> root@...kstar:~/iputils#
>
>
> root@...kstar:~# tcpdump -i eth2 -vvv -n host 87.248.113.14 and host
> 86.106.19.75
> tcpdump: listening on eth2, link-type EN10MB (Ethernet), capture size 96 bytes
> 01:19:24.292911 arp who-has 87.248.113.14 tell 86.106.19.75
> 01:19:25.292897 arp who-has 87.248.113.14 tell 86.106.19.75
> 01:19:26.292901 arp who-has 87.248.113.14 tell 86.106.19.75
> 01:19:27.302906 arp who-has 87.248.113.14 tell 86.106.19.75
> 01:19:28.302911 arp who-has 87.248.113.14 tell 86.106.19.75
> 01:19:29.302912 arp who-has 87.248.113.14 tell 86.106.19.75
> 01:19:31.302917 arp who-has 87.248.113.14 tell 86.106.19.75
> 01:19:32.302921 arp who-has 87.248.113.14 tell 86.106.19.75
> 01:19:33.302923 arp who-has 87.248.113.14 tell 86.106.19.75
> 01:19:35.302932 arp who-has 87.248.113.14 tell 86.106.19.75
> 01:19:36.302932 arp who-has 87.248.113.14 tell 86.106.19.75
> 01:19:37.302939 arp who-has 87.248.113.14 tell 86.106.19.75
>
> 12 packets captured
> 12 packets received by filter
> 0 packets dropped by kernel
> root@...kstar:~#
>
>
> There is one exception though, it works when using eth0. I'm
> administrating multiple linux boxes with 2 or 3 ethernet cards and if
> I try pinging with eth0 it does send icmp like it should but when
> specifying eth1 or eth2 is sends arp requests. The distro I'm using is
> Slackware 12.0. I already reported this to the iputils maintainer and
> he recommended to report it here. Thanks in advance.
>
> Regards.
>
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