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Saturday, December 10, 2011

Using curl with IPv6 addresses

Assuming you have a curl compiled with IPv6, if you wanted to hit a page using its IPv6 address rather than its hostname, you have to do it as follows:
curl "http://\[2600:xxx:yyy::zzz\]/page.html"
The square brackets are required to tell curl that it's an IPv6 address and not a host:port pair. The quotes are required to stop the shell from treating the square brackets as a glob. The backslash is required to stop curl from treating the square brackets as a range specification. The http:// is optional, but good form. This isn't required if you use a hostname or an IPv4 address.

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