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PCs are connected to Cisco switch and up link goes to Cisco 1841 router on router LAN side interface f0/0 ip add: 2001:xx:xx:xx:1000::64/120. IPv6 is not enabled.

I am not able to give prefix length in Windows XP. but I can give prefix in Windows 7 machine.

output of ipconfig from pc1:

Ethernet Adapter Local Area Connection: 
Connection-specific DNS Suffix . 
IP Address. . . . . . . . . . . . : 192.168.1.10 
Subnet Mask . . . . . . . . . . . : 255.255.255.0 
IP Address. . . . . . . . . . . . : 2001:xx:xx:xx:1000::a 
IP Address. . . . . . . . . . . . : fe80::d465:d174:df76:f501%13 
Default Gateway . . . . . . . . . : 192.168.1.100
                                    2001:xx:xx:xx:1000::64

My problem is I can ping from PC to router's f0/0:2001:xx:xx:xx:1000::64 and from router to PC also. But I can't ping from pc1(2001:xx:xx:xx:1000::a) to pc2(2001:xx:xx:xx:1000::b), whereas I can ping IPv4 address of pc2. and firewall is off on every pc.

Daniel t.
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Chintan
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  • Where is PC2 in all this in relation to PC1 and the router? – Rex Apr 17 '15 at 14:39
  • Why do you have a prefix length of `/120`? This is nonstandard and will cause many things to break. In particular, XP and 2003 cannot be made to handle it at all. There is no way. Use the standard `/64` prefix and save yourself a lot of trouble. – Michael Hampton Apr 17 '15 at 14:52
  • Pc2 has similar IP address in same lan segment.. – Chintan Apr 17 '15 at 18:21
  • Pc2 is connected to same switch means in same lan network.. Pc2: 192.168.1.11, 2001:xx:xx:xx:1000::b – Chintan Apr 17 '15 at 18:23
  • Actually we thought that by using 120 prefix length we can have 2 digits to configure ipv6 address just like ipv4 address's 4th octet(11 is b)..Any other problem with the configuration.friends?? – Chintan Apr 17 '15 at 18:33
  • and sorry by mistake i have written that ipv6 is not enabled. – Chintan Apr 18 '15 at 07:50
  • i haven't given command ipv6 unicast-routing on 1841 router. – Chintan Apr 18 '15 at 07:52

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