IPv6 address range filter

Are you trying to apply masks to IPv6 addresses in capture filters or display filters? For capture filters you'd use net:

ip6 net fe00::/10

As Sake said, you can't apply masks to IPv6 addresses in display filters (not yet, at least) but you can use comparison operators:

ipv6.src >= fe80:: && ipv6.src < fec0::

i just tried a few combinations myself, and am also stumped (using both WS 1.2 and 1.4). I thought that I had used this in past, but I'm not sure now.

Even looking through this Sharkfest '10 presentation, I can't find any clues there (lots of mentions of networks with masks, though no screenshots showing a relevant display filter). link text

Maybe no one has implemented this yet. If you don't get any positive responses, file a feature request bug.

I just looked at the sourcecode and there is indeed no functionality implemented yet to accept a prefix-length in a display filter. I'm looking into it right now, but as I have not done much with the display filter engine, I'm not sure I will come up with a solution shortly.

Could you file an enhancement request on https://bugzilla.wireshark.org to be sure it won't get lost?