nanog mailing list archives
Re: Common operational misconceptions
From: Andrew Jones <aj () jonesy com au>
Date: Mon, 20 Feb 2012 15:09:34 +1100
On Mon, 20 Feb 2012 11:17:32 +0900, Masataka Ohta <mohta () necom830 hpcl titech ac jp> wrote:
draft-ohta-urlsrv-00.txt DNS SRV RRs of a domain implicitly specify servers and port numbers corresponding to the domain. By combining URLs and SRV RRs, no port numbers have to be specified explicitly in URLs, even if non-default port numbers are used, which makes URLs more concise for port based virtual and real hosting, where port based real hosting means that multiple servers sharing an IP address are distinguished by port numbers to give service for different URLs, which is the case for port forwarded servers behind NAT and servers with realm specific IP.
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 DPI. This is not as much of a problem on the firewall protecting the servers (you know what ports to inspect), but will require a lot more processing power on the client-side NAT firewall. Jonesy
Current thread:
- Re: Common operational misconceptions, (continued)
- Re: Common operational misconceptions David Barak (Feb 17)
- 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)