mtu, maxmss

[Bob Zoller <bob_(_at_)_helpermonkey_(_dot_)_org>]

I was browsing around today and I came across a site that talked about
speeding up cable modems.  Basically, they're all registry settings in
Windoze.. they change the MaxMTU, MaxMSS, DefaultRcvWindow, DefaultTTL and
some other bullshit around.  So my question is this:  how can I set (or at
least check) the current values for MTU and the like in OpenBSD?

I checked the manpage on ifconfig but didn't see anything..

Thanks,
--Bob