RE: NATs are NOT Firewalls

2003-06-18 Thread Michel Py
Eric, I agree with most of your post but there is something that you have not grasped IMHO. It is true that "dissimulating" the private (RFC1918?) address does not achieve much in terms of security: in order to access: http://arneill-py.sacramento.ca.us/ipv6mh/ you do not need to know nor care th

Re: NATs are NOT Firewalls

2003-06-18 Thread S Woodside
On Wednesday, June 18, 2003, at 06:28 PM, Tomson Eric ((Yahoo.fr)) wrote: Now, the fact that masking the internal addresses to the external world - so that internal hosts can initiate traffic to the outside, but no external host can initiate traffic to the inside - brings some basic security, i

Re: NATs are NOT Firewalls

2003-06-18 Thread Valdis . Kletnieks
On Thu, 19 Jun 2003 00:55:49 EDT, S Woodside said: > On Wednesday, June 18, 2003, at 06:28 PM, Tomson Eric ((Yahoo.fr)) > wrote: > > > Now, the fact that masking the internal addresses to the external > > world - so that internal hosts can initiate traffic to the outside, > > but no > > externa

Re: NATs are NOT Firewalls

2003-06-19 Thread Daniel Senie
At 01:34 AM 6/19/2003, [EMAIL PROTECTED] wrote: On Thu, 19 Jun 2003 00:55:49 EDT, S Woodside said: > On Wednesday, June 18, 2003, at 06:28 PM, Tomson Eric ((Yahoo.fr)) > wrote: > > > Now, the fact that masking the internal addresses to the external > > world - so that internal hosts can initiate

RE: NATs are NOT Firewalls

2003-06-19 Thread Michel Py
Daniel, I agree with the rest of your post, however > Since NAPT uses stateful inspection to operate, I think I don't agree with this. I would say that NAPT is a stateful process but not that it uses inspection. By "inspection" I understand a more intelligent process that decapsulates packets an

Re: NATs are NOT Firewalls

2003-06-19 Thread S Woodside
On Thursday, June 19, 2003, at 01:34 AM, [EMAIL PROTECTED] wrote: Is this just security through obscurity, or something better? Security through obscurity. See Bellovin's paper on enumerating through a NAT. http://www.research.att.com/~smb/papers/fnat.pdf This paper has nothing to do with secu

RE: NATs are NOT Firewalls

2003-06-19 Thread shogunx
On Thu, 19 Jun 2003, Michel Py wrote: > Daniel, > > I agree with the rest of your post, however > > > Since NAPT uses stateful inspection to operate, when referring to NAPT, we are talking about rinetd, right? you can run that on a linux box with two network interfaces (ethernet, ppp, token ring

Re: NATs are NOT Firewalls

2003-06-20 Thread Valdis . Kletnieks
On Thu, 19 Jun 2003 03:57:40 EDT, Daniel Senie <[EMAIL PROTECTED]> said: > Maybe YOU should read it, and explain how this is useful for attacking the > hosts behind a NAPT box. The technique described in this paper uses > variations in the IPid field as evidence of more than one host generating

Re: NATs are NOT Firewalls

2003-06-20 Thread Dean Anderson
Hackers first crack the exposed host. Then they see if it has multiple interfaces. The local ARP cache will tell them the RFC1918 addresses if it is a NAT. The "NAT" just clusters several machines together in one machine. Whether there are multiple machines behind a NAT is of little consequence.