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root@exchg:~# ping6 2002:54f6:a172::1
PING 2002:54f6:a172::1(2002:54f6:a172::1) 56 data bytes
64 bytes from 2002:54f6:a172::1: icmp_seq=1 ttl=63 time=27.3 ms
64 bytes from 2002:54f6:a172::1: icmp_seq=2 ttl=63 time=21.4 ms
64 bytes from 2002:54f6:a172::1: icmp_seq=3 ttl=63 time=23.6 ms
64 bytes from 2002:54f6:a172::1: icmp_seq=4 ttl=63 time=21.9 ms
^C
--- 2002:54f6:a172::1 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3004ms
rtt min/avg/max/mdev = 21.449/23.590/27.392/2.344 ms


root@exchg:~# curl -g -v 2002:54f6:a172::1
* getaddrinfo(3) failed for 2002:54f6:a172::1
* Couldn't resolve host '2002:54f6:a172:'
* Closing connection #0
curl: (6) Couldn't resolve host '2002:54f6:a172:'
root@exchg:~# curl -g -v http://[2002:54f6:a172::1]
* About to connect() to 2002:54f6:a172::1 port 80 (#0)
*   Trying 2002:54f6:a172::1... connected
* Connected to 2002:54f6:a172::1 (2002:54f6:a172::1) port 80 (#0)
> GET / HTTP/1.1
> User-Agent: curl/7.21.0 (x86_64-pc-linux-gnu) libcurl/7.21.0 OpenSSL/0.9.8o zlib/1.2.3.4 libidn/1.15 libssh2/1.2.5
> Host: [2002:54f6:a172::1]
> Accept: */*
> 
< HTTP/1.1 200 OK
< Date: Sat, 29 Jan 2011 19:12:05 GMT
< Server: Apache/2.2.16 (Debian)
< Last-Modified: Sat, 29 Jan 2011 19:07:50 GMT
< ETag: "9c5-9b5-49b00e621c0af"
< Accept-Ranges: bytes
< Content-Length: 2485
< Vary: Accept-Encoding
< Content-Type: text/html
< X-Pad: avoid browser bug
< 
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* Connection #0 to host 2002:54f6:a172::1 left intact
* Closing connection #0
root@exchg:~# curl -g -v 2002:54f6:a172::1
* getaddrinfo(3) failed for 2002:54f6:a172::1
* Couldn't resolve host '2002:54f6:a172:'
* Closing connection #0
curl: (6) Couldn't resolve host '2002:54f6:a172:'