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  #1 (permalink)  
Old 05-22-2009
yanglei_fage yanglei_fage is offline
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Join Date: Jan 2009
Posts: 25
can't reach host with ipv6
Hi all,

First I know little about ipv6.
I have two target. A and B,A and B connet with each other *directly* with line.and I can ping each other with ipv4

For A:
PHP Code:
[root@localhost leilyang]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:21:9B:80:51:68
          inet addr:128.224.159.188  Bcast:128.224.159.255  Mask:255.255.254.0
          inet6 addr: fe80::221:9bff:fe80:5168/64 Scope:Link
          inet6 addr: 2002:1::10/64 Scope:Global
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:4115311 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2408411 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:936528667 (893.1 MiB)  TX bytes:464660931 (443.1 MiB)
          Memory:fe9e0000-fea00000

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:121667 errors:0 dropped:0 overruns:0 frame:0
          TX packets:121667 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:15175375 (14.4 MiB)  TX bytes:15175375 (14.4 Mi 
For B:
PHP Code:
root@localhost:/netperf_image> lsmod
Module                  Size  Used by
binfmt_misc            11872  1 
ipv6                  348912  38 

root@localhost:/netperf_image> ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0F:B7:10:34:0E  
          inet addr:100.0.0.10  Bcast:100.255.255.255  Mask:255.0.0.0
          inet6 addr: 2002:1::2/64 Scope:Global
          inet6 addr: fe80::20f:b7ff:fe10:340e/64 Scope:Link
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:20807444 errors:0 dropped:0 overruns:0 frame:0
          TX packets:33797349 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:4221376854 (3.9 GiB)  TX bytes:38935450650 (36.2 GiB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:1676 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1676 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:206456 (201.6 KiB)  TX bytes:206456 (201.6 KiB) 
On the A , I ping6 2002:1::2, but fail to ping.

On the B. I run
PHP Code:
root@localhost:/netperf_image> tcpdump -n ip6
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
02:15:01.274586 IP6 2002:1::10 > ff02::1:ff00:2: ICMP6, neighbor solicitation, who has 2002:1::2, length 32
02:15:03.274684 IP6 2002:1::10 > ff02::1:ff00:2: ICMP6, neighbor solicitation, who has 2002:1::2, length 32
02:15:04.274269 IP6 2002:1::10 > ff02::1:ff00:2: ICMP6, neighbor solicitation, who has 2002:1::2, length 32
02:15:05.273853 IP6 2002:1::10 > ff02::1:ff00:2: ICMP6, neighbor solicitation, who has 2002:1::2, length 32
02:15:07.274028 IP6 2002:1::10 > ff02::1:ff00:2: ICMP6, neighbor solicitation, who has 2002:1::2, length 32
02:15:08.273606 IP6 2002:1::10 > ff02::1:ff00:2: ICMP6, neighbor solicitation, who has 2002:1::2, length 32
02:15:09.273191 IP6 2002:1::10 > ff02::1:ff00:2: ICMP6, neighbor solicitation, who has 2002:1::2, length 32
02:15:11.273365 IP6 2002:1::10 > ff02::1:ff00:2: ICMP6, neighbor solicitation, who has 2002:1::2, length 32
02:15:12.272943 IP6 2002:1::10 > ff02::1:ff00:2: ICMP6, neighbor solicitation, who has 2002:1::2, length 32
02:15:13.272529 IP6 2002:1::10 > ff02::1:ff00:2: ICMP6, neighbor solicitation, who has 2002:1::2, length 32
02:15:15.272703 IP6 2002:1::10 > ff02::1:ff00:2: ICMP6, neighbor solicitation, who has 2002:1::2, length 32
02:15:16.273286 IP6 2002:1::10 > ff02::1:ff00:2: ICMP6, neighbor solicitation, who has 2002:1::2, length 32 
Thanks for your time
Last edited by yanglei_fage; 05-22-2009 at 05:44 AM..
  #2 (permalink)  
Old 06-19-2009
luiskale luiskale is offline
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Join Date: Jun 2009
Posts: 5
Issue whit the local link
Hello i think you may have an issue whit your local link, the ipv6 use a different concept on the multicast or broadcast, and to reach the local link layer you need to add an specific ip address, I think you can find your answer here, Supporting IPv6 on a Linux Server Node you can find the correct local link.
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