Hello!
I have question I'd like to ask. We have a dedicated server and we got an IPv6 /64 block.

Is it possible to use one particular IP from /64 range? let's say using in squid proxy
For example:
My range is 2001:db8::/64, and I want to use only one address 2001:db8::1/128 or 2001:db8::2/128.
But whenever I do I still get on (http://www.whatismyip.com/)
that I'm using 2001:db8:: (which is whole range, but maybe is there a better way of checking which IP is being used?)

What I want to achieve is to be able to explicitly select and use one particular IP from my /64 range

Is it even possible?

Each NIC normally occupy one IPv6 address only even if the netmask is /64. The /64 only affect routing and broadcast on the machine.

First, 2001:db8:: is a /32 block in IPv6, and /32 blocks are normally assigned to ISPs. You should be able to get any job done with a /64, if not a /48 (like if you have multiple networks and want each to have a /64 of addresses as a /48 provides 65,536 /64 blocks). For a better way of checking what IP is being used, use http://ip6.me.

In your case, you want to assign just one IP from your allocated range to a network adapter, then force squid to only use that adapter. For example, you could assign the address 2001:db8:dead:beef::1 to eth0, then force squid to listen only on that IPv6 address. That way outgoing requests to the IPv6 internet are sent out with the IP 2001:db8:dead:beef::1.

Also, I'd recommend you go through Hurricane Electric's IPv6 certification training, if you pass with a good score you get a free t-shirt.

yeah, I have only one /64 block and what I want is to be able to use all single adresses from this pool evenly, and I'm asking for example squid configuration to be able to do such thing.

PS. by example i mean example, surely I don't want you guys to do my job

There are 2 NIC on squid proxy server normally, one for LAN and another for WAN. Both side just request one IP address even if netmask is /64. You can use /128 netmask but route configuration should be special.
Do you find out LAN or WAN side use multi IP address?

What do you mean by special?

if it's of any help, this is my ifconfig eth0:

The 2001:1234:dead:beef::/64 is network IPv6 address, not host IPv6 address. Host IPv6 address should be 2001:1234:dead:beef:x:x:x:x/64. First four digits stand for network address and last four is host address in this network.
You should use host address instead of network address. The network address is used when route is configured.