SixXS::Sunset 2017-06-06

Cisco IOS ntp server not allowing IPv6 addresses
[ca] 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
[ch] Jeroen Massar SixXS Staff 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
[ca] 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
[ca] 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
[us] 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

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