[arch-general] IPv6 causing wget/curl to hang for a long time?

[KESHAV P.R.]

On Sun, Jun 5, 2011 at 16:06, Oon-Ee Ng <ngoonee.talk at gmail.com> wrote:
> I use the following line to get my current external IP in conky.
> Recently Its been hanging for ages before responding, so I tried it
> out and it seems to try an ipv6 address first before timing out and
> succeeding on the ipv4 address. I know I can just disable ipv6, but
> since on June 8th (AFAICR) there's gonna be a large scale test of that
> on the interwebz, probably a good thing to keep around. Any
> suggestions what the problem could be? Is it simply a faulty DNS
> server (I'm using my local ISP's DNS)?
>
>  wget -O -i icanhazip.com
> --2011-06-05 18:28:04--  http://icanhazip.com/
> Resolving icanhazip.com... 2001:470:1f10:d57:feed:beef:cafe:d00d, 50.56.84.181
> Connecting to icanhazip.com|2001:470:1f10:d57:feed:beef:cafe:d00d|:80...
> failed: Connection timed out.
> Connecting to icanhazip.com|50.56.84.181|:80... connected.
> HTTP request sent, awaiting response... 200 OK
> Length: 16 [text/plain]
> Saving to: “-i”
>
> 100%[====================================================================================================================>]
> 16          --.-K/s   in 0s
>

I had the same problem and i disabled ipv6. If the ipv6 module is not
loaded and no ipv6 dns are defined (see
http://www.chaz6.com/files/resolv.conf for a list of public ipv6 dns
addresses), then you won't get this problem. The June 8th IPv6 test is
for the same reason, browsers trying ipv6 address (till time-out)
before fall-back to IPv4 address (if ipv6 module is loaded).

Or you can use a IPv6 tunnel broker like freenet6 or Hurricane
Electric and enable ipv6 module and ipv6 dns.

Regards.

Keshav