If you're forwarding your ports it means you have a router.
You needn't worry about your IP being static or otherwise if you
have a router, because it is the only "machine" on your network that
sees your true IP. Your tier 1 IP.
Your computers on the network have IP's like 192.168.1.101, and those are assigned via DHCP on the router. LET IT DO ITS JOB.
IF you force the router and your computer to give you a STATIC tier
2 IP, you're creating a lot more problems than you're solving.
Right now, say there's 3 comps on your network, you're .101, they're .102 and .103 respectively.
You turn yours off, 103 stays on, and 102 gets turned off.
It gets turned back on before yours, then you turn yours on.
Chances are, it'll be .101 and you'll be .102. That's no big deal,
because you just log back into the router and change the forward to
point to .102.
I can't think of how your "router would screw up after several
hours", unless it's that your local IP, aka your tier 2 IP, happened to
change. If indeed your router is locking up, force a hard reset and/or
look for new firmware.
And as for "which is my secure", saying that either one is more
secure is an illusion. Having a dynamic tier 1 IP still makes you
infinitely trackable, since your ISP ALWAYS keep tabs on who has what
IP at what time. So, when the MPAA
wants to send you a letter, they contact your ISP w/ the offending IP
and time stamp, and you get a letter/disconnect. The only real benefit
to a dynamic tier 1, is that if you get banned, you might be able to
get back on a site, but there are several other ways to do that
significantly more easily.
Having a static tier 1 IP is actually pretty handy. It lets you do lots of fun things you might not otherwise be able to do.
Oh...and dynamic IP's aren't anything near random. They're assigned
from a pool associated to your location on the node...meaning they can
still whois you or traceroute you and find you...if "they" wanted to.
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