Hello,
My users have asked me to add ipv6 support to my DNS server. In order to
test this, it is best if I have multiple loopback ipv6 addresses, so
that I can run multiple instances of the DNS server. Unlike ipv4,
which has some 16 million loopback ip addresses, ipv6 only has one
(I would think that, with ipv6's larger ip address space it would have
even more loopback addresses than ipv4. I guess I was wrong)
Anyway, one loopback isn't enough for some of my testing. That in mind,
I have set up some other loopback addresses:
ifconfig lo add fecf::1/128
ifconfig lo add fecf::2/128
ifconfig lo add fecf::3/128
ifconfig lo add fecf::4/128
etc. My first question: Is there a way, with Linux' ifconfig, to say
"I want all of the ipv6 addresses starting with fecf:0000:0000:etc.:00xx
to be a loopback interface".
My second question: Is using fecf the best prefix for this kind of testing?
I know that RFC3879 has deprecated the use of these addresses for the
ipv6 equivalent of NAT RFC1918 addresses (I think RFC3879 is a bad idea
but that is another discussion), but I can't see any other reasonable
way to get a bunch of localhost addresses, short of completely ignoring the
specs and making up addresses.
Oh: Is it possible to get an ISP with ipv6 connectivity in the US? I am
not able to send DNS queries to the ipv6 addresses of the root servers
(2001:478:65::53, 2001:500::1035, 2001:500:1::803f:235, 2001:7fd::1
and 2001:dc3::35) from my US DSL connection:
$ dig @2001:500::1035 www.google.com
; <<>> DiG 8.4 <<>> @2001:500::1035 www.google.com
; (1 server found)
;; res options: init recurs defnam dnsrch no-nibble2
;; res_nsend: Connection refused
- Sam
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