CCIE Pursuit Blog

December 8, 2007

Simple Pleasures

Sometimes it’s little discoveries that make your day.  I thought that you needed to include the “ipv6” keyword in IPv6 pings, but it turns out that you don’t:

With “ipv6”:
r2#p ipv6 2001:CC1E:1::3

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2001:CC1E:1::3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/4 ms
Without “ipv6”:
r2#p 2001:CC1E:1::3

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2001:CC1E:1::3, timeout is 2 seconds:
!!!!!

I suppose that this makes sense (it also shows you how little experience I have with IPv6) as it’s not that difficult for IOS to decipher IPv4 from IPv6 from a domain name.

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