Cisco IOS ntp server not allowing IPv6 addresses
Carmen Sandiego on Thursday, 04 June 2009 21:03:49
This is on a IPv6-only 3750 running ADVIPSERVICESK9-M, Version 12.2(44)SE.
Everything IPv6-wise is working correctly...except NTP.
Say I want to add ntp.hexago.com to the ntp server, if I issue ntp server ntp.hexago.com it resolves to 206.162.147.153 which will not work in the IPv6-only lab (the only dual stack machine is the FreeBSD router box running the tunnel).
So I tried this on my FreeBSD computer:
host -T ntp.hexago.com ntp.hexago.com is an alias for hiphop.hexago.com.
hiphop.hexago.com has address 206.162.147.153
hiphop.hexago.com has IPv6 address 2001:5c0:0:2::25
Then ntp server 2001:5c0:0:2::25 on the 3750 and this is the output:
Switch(config)#ntp server 2001:5c0:0:2::25
^
% Invalid input detected at '^' marker.
So quite obviously that IOS doesn't support NTP over IPv6. FreeBSD's ntpdate and ntpd works correctly with IPv6. So how does one keep time between Cisco equipment on a IPv6-only network?
Any comments?
Cisco IOS ntp server not allowing IPv6 addresses
Jeroen Massar on Thursday, 04 June 2009 22:12:00
You don't ;)
File a bug report/feature request report at Cisco...
Cisco IOS ntp server not allowing IPv6 addresses
Carmen Sandiego on Thursday, 04 June 2009 23:05:06
Hm, I'll file that report and get back once I receive a reply. I'm pretty sure they are already aware of the problem though... Let's see what they have to say about it.
Cisco IOS ntp server not allowing IPv6 addresses
Carmen Sandiego on Friday, 05 June 2009 18:41:28
Apparently NTP v4 will be supported in a future IOS release...
Cisco IOS ntp server not allowing IPv6 addresses
Carmen Sandiego on Monday, 03 August 2009 15:52:32
http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-ntpv4.html
NTPv4 (IPv6 support is now available for ISR router running 12.4(20)T
Support should be integrated into the Catalyst code train in 12.2(33)SXI
Posting is only allowed when you are logged in. |