Re: Bad performance when using IPv4 and IPv6 together

[kuznet@xxxxxxxxxxxxx]

Hello!

> Have you only tested ICMP using ping?  I was observing odd behaviour of
> ping6 also but suspect it's actually ping6.  So for example ping6 behaves
> different for me depending if I give it a hostname or an IP address -
> even though both refer to the same address of a local interface.

DNS. Reversed resolutions for IPv6 are _damnly_ slow.

By default ping6 from iputils disables reversed resolution, when
you give numeric address.

No matter: net results obtained with ping/ping6 from iputils do not depend
on (mis)configuration of DNS. It may delay waiting for DNS, but the results
for latency are right anyway.

Alexey