On Mon, 2011-01-03 at 18:09 -0600, Dave Ihnat wrote: > On Mon, Jan 03, 2011 at 04:14:58PM -0500, Michael H. Warfield wrote: > > NAT is a vile and evil abomination which was created in a half assed > > effort to extend the life of IPv4. > Are you really proposing that all IPv6 addresses for LANs be exposed to > the Internet? That's what I think I'm reading. The IPv6 firewalls on Linux are just as good as the IPv4 firewalls. I didn't start participating in IPv6 until I had decent firewalls. But that was 10 years ago now at this point. That's old old news. There is a wide spread myth that NAT and the fact that you are on different addresses some how bestows upon you some measure of security. As a leading security researcher, let me impress upon you that nothing could be further from the truth. You can security from the inherent statefulness of your common consumer grade NAT but there are other forms of NAT which do not convey this. Merely the fact that your addresses are mapped do not provide you with any protection. It's the state engine and the dynamic mapping that do this. But, SURPRISE, that exactly what's in a stateful firewall. There is NO intrinsic advantage of NAT over a decent stateful firewall. None. IPv6 also has a number of security advantages over IPv4, not the least of which are "no broadcast address" and "virtually impossible to comprehensively brute force scan". That doesn't mean it can't be scanned (the scans have to be more targeted and intelligent), but this "scan the planet" scanning non-sense I see in my honeynets and net-telescope every day (mostly ssh, vnc, and an occasional ftp, telnet, and rdp) are a thing of the past. Smurf attacks (attacks against the local broadcast address) are a thing of the past. UDP flood popup spam is history (well, it should be now anyways, since MS fixed that crap). There are big advantages to that insanely huge local subnet address space. > Cheers, > -- > Dave Ihnat > dihnat@xxxxxxxxxx Regards, Mike -- Michael H. Warfield (AI4NB) | (770) 985-6132 | mhw@xxxxxxxxxxxx /\/\|=mhw=|\/\/ | (678) 463-0932 | http://www.wittsend.com/mhw/ NIC whois: MHW9 | An optimist believes we live in the best of all PGP Key: 0x674627FF | possible worlds. A pessimist is sure of it!
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