nanog mailing list archives
Re: Common operational misconceptions
From: Jimmy Hess <mysidia () gmail com>
Date: Sun, 19 Feb 2012 22:40:57 -0600
On Sun, Feb 19, 2012 at 10:09 PM, Andrew Jones <aj () jonesy com au> wrote:
On Mon, 20 Feb 2012 11:17:32 +0900, Masataka Ohta It seems to me that this will create all sorts of headaches for firewall ALGs. Rather than just passing port 21/tcp traffic to the FTP ALG for example, the devices would need to inspect traffic on all ports and perform
[snip] That doesn't work when the FTP control connection is encrypted using SSL. Layer 4 Firewall devices should not be expecting to intercept FTP traffic and make decisions based on the application layer contents of the traffic. I would suggest a requirement that FTP clients utilizing SRV records to access FTP on an alternate port MUST utilize Firewall-Friendly FTP as described by RFC1579. Each FTP server can then be assigned its own port range, or the FTP server can be configured to notify the Firewall device which ports to forward using UpNP or a NAT traversal protocol such as STUN, and the Firewall device can be configured to forward the appropriate range of ports to the correct server. -- -JH
Current thread:
- Re: Common operational misconceptions, (continued)
- Re: Common operational misconceptions Owen DeLong (Feb 17)
- Re: Common operational misconceptions Masataka Ohta (Feb 18)
- Re: Common operational misconceptions Owen DeLong (Feb 19)
- Re: Common operational misconceptions Joe Greco (Feb 19)
- Re: Common operational misconceptions Mark Andrews (Feb 19)
- Re: Common operational misconceptions Owen DeLong (Feb 20)
- Re: Common operational misconceptions Jimmy Hess (Feb 19)
- Re: Common operational misconceptions Karl Auer (Feb 19)
- Re: Common operational misconceptions Masataka Ohta (Feb 19)
- Re: Common operational misconceptions Andrew Jones (Feb 19)
- Re: Common operational misconceptions Jimmy Hess (Feb 19)
- Re: Common operational misconceptions Valdis . Kletnieks (Feb 20)
- Re: Common operational misconceptions Jay Ashworth (Feb 17)
- Re: Common operational misconceptions Sven Olaf Kamphuis (Feb 17)
- Re: Common operational misconceptions Eugen Leitl (Feb 17)
- Re: Common operational misconceptions Sven Olaf Kamphuis (Feb 17)