[ds6] Help required: Unable to Ping Global Ipv6 address from
different host
somashekar
somashekar at celstream.com
Wed Apr 5 13:54:46 CEST 2006
Hi All,
I have two desktops which are installed with Fedora Core release 3,
connected with each other using Ethernet hub (crash net)
They are not connected to the main network (i.e., uplink is not
connected)
I am trying to establishing a network where the two PCs can communicate
each other using IPv6 addresses.
Both hosts are IPv6 enabled.
Iam able to ping the link-local ipv6 address from one host to another
host.
But unable to ping the global ipv6 address.
The configuration of the two PCs, which are named as Host-A and Host-B
are as shown below.
Host-A configuration
-----------------------------
After reboot, [root at localhost ~]# ifconfig
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:3586 errors:0 dropped:0 overruns:0 frame:0
TX packets:3586 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:4476276 (4.2 Mb) TX bytes:4476276 (4.2 Mb)
------------------------------------------------------------------------
-----------------------------
Iam assigning 10.255.114.96 address to Host-A
[root at localhost ~]# ifconfig eth0 10.255.114.96
eth0 Link encap:Ethernet HWaddr 00:08:74:2E:41:54
inet addr:10.255.114.96 Bcast:10.255.255.255 Mask:255.0.0.0
inet6 addr: fe80::208:74ff:fe2e:4154/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1 errors:0 dropped:0 overruns:0 frame:0
TX packets:19 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:64 (64.0 b) TX bytes:3910 (3.8 Kb)
Base address:0xecc0 Memory:ff8e0000-ff900000
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:3586 errors:0 dropped:0 overruns:0 frame:0
TX packets:3586 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:4476276 (4.2 Mb) TX bytes:4476276 (4.2 Mb)
------------------------------------------------------------------------
-----------------------
Initial /etc/resolv.conf
; generated by /sbin/dhclient-script
search xerox.celstream.com
nameserver 10.255.114.25
---------------------------------------------------------------------
I have used bind-9.3.2 for DNS Server configuration.
After changing resolv.conf as shown below
; generated by /sbin/dhclient-script
search celstream1.com
nameserver 10.255.114.96
------------------------------------------------------------------------
-
Ping DNS Server "celstream1.com"
[root at localhost ~]# ping ns1.celstream1.com
PING ns1.celstream1.com (10.255.114.96) 56(84) bytes of data.
64 bytes from ns1.celstream1.com (10.255.114.96): icmp_seq=0 ttl=64
time=0.056 ms
64 bytes from ns1.celstream1.com (10.255.114.96): icmp_seq=1 ttl=64
time=0.072 ms
64 bytes from ns1.celstream1.com (10.255.114.96): icmp_seq=2 ttl=64
time=0.068 ms
64 bytes from ns1.celstream1.com (10.255.114.96): icmp_seq=3 ttl=64
time=0.068 ms
--- ns1.celstream1.com ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3000ms
rtt min/avg/max/mdev = 0.056/0.066/0.072/0.006 ms, pipe 2
------------------------------------------------------------------------
------------------------------------------------------
Ping6 Link-local ipv6 address fe80::208:74ff:fe2e:4154
[root at localhost ~]# ping6 -I eth0 fe80::208:74ff:fe2e:4154
PING fe80::208:74ff:fe2e:4154(fe80::208:74ff:fe2e:4154) from ::1 eth0:
56 data bytes
64 bytes from fe80::208:74ff:fe2e:4154: icmp_seq=0 ttl=64 time=0.111 ms
64 bytes from fe80::208:74ff:fe2e:4154: icmp_seq=1 ttl=64 time=0.060 ms
64 bytes from fe80::208:74ff:fe2e:4154: icmp_seq=2 ttl=64 time=0.060 ms
64 bytes from fe80::208:74ff:fe2e:4154: icmp_seq=3 ttl=64 time=0.059 ms
--- fe80::208:74ff:fe2e:4154 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 2999ms
rtt min/avg/max/mdev = 0.059/0.072/0.111/0.023 ms, pipe 2
------------------------------------------------------------------------
-----------------------------------------------------
/etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=dhcp
ONBOOT=yes
TYPE=Ethernet
IPV6INIT=yes
IPV6TO4INIT=yes
DHCP6C=yes
IPV6ADDR=fe80::208:74ff:fe2e:4154
------------------------------------------------------------------------
---
/etc/sysconfig/network-scripts/ifcfg-lo
DEVICE=lo
IPADDR=127.0.0.1
NETMASK=255.0.0.0
NETWORK=127.0.0.0
# If you're having problems with gated making 127.0.0.0/8 a martian,
# you can change this to something else (255.255.255.255, for example)
BROADCAST=127.255.255.255
ONBOOT=yes
NAME=loopback
------------------------------------------------------------------------
-----
[root at localhost ~]# ip -6 route show
unreachable ::/96 dev lo metric 1024 error -101 mtu 16436 advmss 16376
metric10 64
unreachable ::ffff:0.0.0.0/96 dev lo metric 1024 error -101 mtu 16436
advmss 16376 metric10 64
unreachable 2002:a00::/24 dev lo metric 1024 error -101 mtu 16436
advmss 16376 metric10 64
unreachable 2002:7f00::/24 dev lo metric 1024 error -101 mtu 16436
advmss 16376 metric10 64
unreachable 2002:a9fe::/32 dev lo metric 1024 error -101 mtu 16436
advmss 16376 metric10 64
unreachable 2002:ac10::/28 dev lo metric 1024 error -101 mtu 16436
advmss 16376 metric10 64
unreachable 2002:c0a8::/32 dev lo metric 1024 error -101 mtu 16436
advmss 16376 metric10 64
unreachable 2002:e000::/19 dev lo metric 1024 error -101 mtu 16436
advmss 16376 metric10 64
unreachable 3ffe:ffff::/32 dev lo metric 1024 error -101 mtu 16436
advmss 16376 metric10 64
fe80::/64 dev eth0 metric 256 mtu 1500 advmss 1440 metric10 64
ff00::/8 dev eth0 metric 256 mtu 1500 advmss 1440 metric10 1
unreachable default dev lo proto none metric -1 error -101 metric10
255
------------------------------------------------------------------------
-----
[root at localhost ~]# ip route show
[root at localhost network-scripts]# ip route show
169.254.0.0/16 dev lo scope link
10.0.0.0/8 dev eth0 proto kernel scope link src 10.255.114.96
------------------------------------------------------------------------
------
ping6 Host-B Ipv6 address
[root at localhost network-scripts]# ping6 -I eth0 fe80::206:5bff:fe20:406c
PING fe80::206:5bff:fe20:406c(fe80::206:5bff:fe20:406c) from
fe80::208:74ff:fe2e:4154 eth0: 56 data bytes
64 bytes from fe80::206:5bff:fe20:406c: icmp_seq=0 ttl=64 time=1.31 ms
64 bytes from fe80::206:5bff:fe20:406c: icmp_seq=1 ttl=64 time=0.500 ms
64 bytes from fe80::206:5bff:fe20:406c: icmp_seq=2 ttl=64 time=0.435 ms
--- fe80::206:5bff:fe20:406c ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 0.435/0.750/1.316/0.401 ms, pipe 2
------------------------------------------------------------------------
------
Using dibbler-0.4.1-linux.tar for DHCP Ipv6 server and client
I got the Global inet6 addr which is 2000::bd
[root at localhost ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:08:74:2E:41:54
inet addr:10.255.114.96 Bcast:10.255.255.255 Mask:255.0.0.0
inet6 addr: fe80::208:74ff:fe2e:4154/64 Scope:Link
inet6 addr: 2000::bd/128 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:71 errors:0 dropped:0 overruns:0 frame:0
TX packets:96 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:8846 (8.6 Kb) TX bytes:10285 (10.0 Kb)
Base address:0xecc0 Memory:ff8e0000-ff900000
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:10317 errors:0 dropped:0 overruns:0 frame:0
TX packets:10317 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:4950042 (4.7 Mb) TX bytes:4950042 (4.7 Mb)
------------------------------------------------------------------------
------
ping6 Host-B Global Ipv6 addr 2000::7f from Host-A
[root at localhost ~]# ping6 -I eth0 2000::7f
connect: Network is unreachable
------------------------------------------------------------------------
------
/etc/sysconfig/network
NETWORKING=yes
HOSTNAME=localhost.localdomain
NETWORKING_IPV6=yes
IPV6INIT=yes
IPV6FORWARDING=yes
IPV6_DEFAULTDEV=tun6to4
Host-B Configuration
----------------------------------
Initial ifconfig
[root at localhost ~]# ifconfig
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:4367 errors:0 dropped:0 overruns:0 frame:0
TX packets:4367 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:5458005 (5.2 Mb) TX bytes:5458005 (5.2 Mb)
------------------------------------------------------------------------
--
[root at localhost ~]# ifconfig eth0 10.255.114.176
eth0 Link encap:Ethernet HWaddr 00:06:5B:20:40:6C
inet addr:10.255.114.176 Bcast:10.255.255.255 Mask:255.0.0.0
inet6 addr: fe80::206:5bff:fe20:406c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:23 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:342 (342.0 b) TX bytes:3955 (3.8 Kb)
Interrupt:11 Base address:0xec80
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:4367 errors:0 dropped:0 overruns:0 frame:0
TX packets:4367 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:5458005 (5.2 Mb) TX bytes:5458005 (5.2 Mb)
------------------------------------------------------------------------
----
[root at localhost ~]# ifconfig -a
eth0 Link encap:Ethernet HWaddr 00:06:5B:20:40:6C
inet addr:10.255.114.176 Bcast:10.255.255.255 Mask:255.0.0.0
inet6 addr: fe80::206:5bff:fe20:406c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:38 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:342 (342.0 b) TX bytes:5605 (5.4 Kb)
Interrupt:11 Base address:0xec80
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:4367 errors:0 dropped:0 overruns:0 frame:0
TX packets:4367 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:5458005 (5.2 Mb) TX bytes:5458005 (5.2 Mb)
sit0 Link encap:IPv6-in-IPv4
NOARP MTU:1480 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
------------------------------------------------------------------------
-
After running dibbler-client
[root at localhost ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:06:5B:20:40:6C
inet addr:10.255.114.176 Bcast:10.255.255.255 Mask:255.0.0.0
inet6 addr: fe80::206:5bff:fe20:406c/64 Scope:Link
inet6 addr: 2000::7f/128 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:55 errors:0 dropped:0 overruns:0 frame:0
TX packets:99 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:5706 (5.5 Kb) TX bytes:13080 (12.7 Kb)
Interrupt:11 Base address:0xec80
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:4367 errors:0 dropped:0 overruns:0 frame:0
TX packets:4367 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:5458005 (5.2 Mb) TX bytes:5458005 (5.2 Mb)
------------------------------------------------------------------------
-
[root at localhost ~]# ping ns1.celstream1.com
PING ns1.celstream1.com (10.255.114.96) 56(84) bytes of data.
64 bytes from ns1.celstream1.com (10.255.114.96): icmp_seq=0 ttl=64
time=0.434 ms
64 bytes from ns1.celstream1.com (10.255.114.96): icmp_seq=1 ttl=64
time=0.473 ms
64 bytes from ns1.celstream1.com (10.255.114.96): icmp_seq=2 ttl=64
time=0.506 ms
--- ns1.celstream1.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2001ms
rtt min/avg/max/mdev = 0.434/0.471/0.506/0.029 ms, pipe 2
----------------------------------------------------------------------
/etc/resolv.conf
; generated by /sbin/dhclient-script
search xerox.celstream.com
nameserver 10.255.114.96
nameserver ::1
search celstream1.com
------------------------------------------------------------------------
--
/etc/sysconfig/network
NETWORKING=yes
HOSTNAME=localhost.localdomain
NETWORKING_IPV6=yes
IPV6INIT=yes
IPV6FORWARDING=yes
IPV6_DEFAULTDEV=tun6to4
-----------------------------------------------------------------------
/etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=dhcp
ONBOOT=yes
TYPE=Ethernet
IPV6INIT=yes
IPV6TO4INIT=yes
IPV6ADDR=fe80::206:5bff:fe20:406c
DHCP6C=yes
------------------------------------------------------------------------
---
[root at localhost ~]# ip -6 route show
unreachable ::/96 dev lo metric 1024 error -101 mtu 16436 advmss 16376
metric10 64
unreachable ::ffff:0.0.0.0/96 dev lo metric 1024 error -101 mtu 16436
advmss 16376 metric10 64
unreachable 2002:a00::/24 dev lo metric 1024 error -101 mtu 16436
advmss 16376 metric10 64
unreachable 2002:7f00::/24 dev lo metric 1024 error -101 mtu 16436
advmss 16376 metric10 64
unreachable 2002:a9fe::/32 dev lo metric 1024 error -101 mtu 16436
advmss 16376 metric10 64
unreachable 2002:ac10::/28 dev lo metric 1024 error -101 mtu 16436
advmss 16376 metric10 64
unreachable 2002:c0a8::/32 dev lo metric 1024 error -101 mtu 16436
advmss 16376 metric10 64
unreachable 2002:e000::/19 dev lo metric 1024 error -101 mtu 16436
advmss 16376 metric10 64
unreachable 3ffe:ffff::/32 dev lo metric 1024 error -101 mtu 16436
advmss 16376 metric10 64
fe80::/64 dev eth0 metric 256 mtu 1500 advmss 1440 metric10 64
ff00::/8 dev eth0 metric 256 mtu 1500 advmss 1440 metric10 1
unreachable default dev lo proto none metric -1 error -101 metric10
255
------------------------------------------------------------------------
---------
[root at localhost ~]# ip route show
169.254.0.0/16 dev lo scope link
10.0.0.0/8 dev eth0 proto kernel scope link src 10.255.114.176
The problem is
I am able to ping6 the link-local ipv6 addresses across the two hosts.
And also able to ping6 the DHCP assigned global ipv6 address within the
same host but not from the other host. It says "Network is unreachable"
as shown below.
[root at localhost ~]# ping6 -I eth0 2000::7f
connect: Network is unreachable
Please let me know if I have missed out any other settings or
configuration, so that I can ping6 using DHCP assigned global ipv6
address across these hosts.
Thanks in advance,
Soma
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