proxies and firewalls

[HOLLOW, CHRISTOPHER]

Proxy doesn't necessarily solve the privateIP-to-publicIP problem.  NAT 
does:

http://www.cablemodemhelp.com/proxy_vs_nat.htm

Proxy is application level.  NAT is address translation.

HTH,

Christopher Hollow


JJB wrote:
> Thanks for your reply, But I must be thick headed this morning,
> because what you say below makes no sense to me.
> I checked out the 2 referenced descriptions and they say
> nothing about doing nat.
> 
> I have Lan with private ip address that send packets to
> public internet. How does an proxy server solve the private ip
> address versus my public ip address problem?
> 
> -----Original Message-----
> From: owner-freebsd-questions at freebsd.org
> [mailto:owner-freebsd-questions at freebsd.org]On Behalf Of
> jan.muenther at nruns.com
> Sent: Monday, February 02, 2004 11:28 AM
> To: JJB
> Cc: Jorn Argelo; questions at freebsd.org
> Subject: Re: proxies and firewalls
> 
> 
>>Are you saying you know of an proxy server that does the nat
>>function?
> 
> 
> Actually, the point of having  proxies is *not* having
> to route. Your proxy machine should not be able to forward packets.
> 
> Roughly, there a two different sub-groups: Circuit layer and
> application
> layer proxies, names should be self explaining.
> 
> Example for an app layer gateway:
> 
> Port:   fwtk-2.1
> Path:   /usr/ports/security/fwtk
> Info:   A toolkit used for building firewalls based on proxy
> services
> 
> 
> Example for a circuit level proxy:
> 
> Port:   nylon-1.2
> Path:   /usr/ports/net/nylon
> Info:   A Unix SOCKS 4 and 5 proxy server
> 
> 
> Socks5 is already app layer, too, IIRC.
> 
> Cheers, J.
> 
> 
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