discussion: Enabling IPv6 on Cisco 6500/7600 breaks IPv4 Internet connectivity
jared at puck.nether.net
Tue Jun 26 16:27:27 CEST 2012
On Jun 26, 2012, at 10:24 AM, Bernhard Schmidt wrote:
> Am 26.06.2012 16:10, schrieb Jared Mauch:
>> I'm once again reminded of something I observed. Make sure you
>> disable ipv6 redirects on all interfaces. This has significant
>> performance penalty. On 6500/sup720 this should be easy to do with
>> interface range command.
> Funky. Is this only the case with non-standard configurations like
> multiple subnets on one interface?
No. It was odd and I didn't collect too much data on this. It led me
to push back against those at vendors who didn't view redirects as harmful.
Its easier to just forward/recirc the packet. I wonder if this was related
to the performance hit observed.
More information about the ipv6-ops