nanog mailing list archives
Re: Is NAT can provide some kind of protection?
From: david raistrick <drais () icantclick org>
Date: Wed, 12 Jan 2011 15:53:07 -0500 (EST)
On Wed, 12 Jan 2011, Chris Adams wrote:
Yes, they do. NAT requires a stateful firewall. Why is that so hard to understand?
Um. No. NAT requires stateful inspection (because NAT needs to maintain a state table), but does not require a stateful firewall. You can (and many CPE appliances do/did) have no firewall, or stateless firewall in front of NAT.
All NAT does is give you an implied deny-all-inbound rule, but doesn't, in and of itself, prevent someone probing open (configured by you or the vendor) ports that are forwarded or on the device. Or from having unfettered inside access of 1 internal IP if you NAT all external ports to an internal IP.
-- david raistrick http://www.netmeister.org/news/learn2quote.html drais () icantclick org http://www.expita.com/nomime.html
Current thread:
- Re: Is NAT can provide some kind of protection?, (continued)
- Re: Is NAT can provide some kind of protection? William Herrin (Jan 13)
- Re: Is NAT can provide some kind of protection? Lamar Owen (Jan 13)
- Re: Is NAT can provide some kind of protection? Owen DeLong (Jan 13)
- Re: Is NAT can provide some kind of protection? Owen DeLong (Jan 12)
- Re: Is NAT can provide some kind of protection? Paul Ferguson (Jan 12)
- Re: Is NAT can provide some kind of protection? Steven Kurylo (Jan 12)
- Re: Is NAT can provide some kind of protection? Owen DeLong (Jan 12)
- Re: Is NAT can provide some kind of protection? Scott Helms (Jan 12)
- Re: Is NAT can provide some kind of protection? Chris Adams (Jan 12)
- Re: Is NAT can provide some kind of protection? Scott Helms (Jan 12)
- Re: Is NAT can provide some kind of protection? david raistrick (Jan 12)
- Re: Is NAT can provide some kind of protection? Jack Bates (Jan 12)
- Re: Is NAT can provide some kind of protection? Miquel van Smoorenburg (Jan 12)
- Re: Is NAT can provide some kind of protection? Scott Helms (Jan 12)
- Re: Is NAT can provide some kind of protection? Owen DeLong (Jan 12)
- Re: Is NAT can provide some kind of protection? Scott Helms (Jan 12)
- Re: Is NAT can provide some kind of protection? Jack Bates (Jan 12)
- Re: Is NAT can provide some kind of protection? Valdis . Kletnieks (Jan 12)
- Re: Is NAT can provide some kind of protection? Owen DeLong (Jan 12)
- Re: Is NAT can provide some kind of protection? Lamar Owen (Jan 13)
- Re: Is NAT can provide some kind of protection? Owen DeLong (Jan 13)