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From: Bennett Haselton on 27 Jan 2010 15:16 When I run "netstat" on my machine I get some lines like: tcp 0 0 ::ffff:69.72.177.140:80 ::ffff:<remote ip address> TIME_WAIT I've read through the netstat man page, and several pages of Google hits for "netstat output", and I can't find an answer to this: What does the "::ffff" mean in front of an IP address in the netstat output? Some lines list a connection and its state, with the "::ffff" in front of the source and destination IP, and some list connections without the "::ffff". I just want to know what the difference is between the lines that have it and the lines that don't. Thanks! Bennett
From: David W. Hodgins on 27 Jan 2010 15:29 On Wed, 27 Jan 2010 15:16:16 -0500, Bennett Haselton <bennett(a)peacefire.org> wrote: > hits for "netstat output", and I can't find an answer to this: What > does the "::ffff" mean in front of an IP address in the netstat That's an ipv6 address, rather then an ipv4 address. Regards, Dave Hodgins -- Change nomail.afraid.org to ody.ca to reply by email. (nomail.afraid.org has been set up specifically for use in usenet. Feel free to use it yourself.)
From: Rick Jones on 27 Jan 2010 17:48 Bennett Haselton <bennett(a)peacefire.org> wrote: > When I run "netstat" on my machine I get some lines like: > tcp 0 0 ::ffff:69.72.177.140:80 ::ffff:<remote ip > address> TIME_WAIT > I've read through the netstat man page, and several pages of Google > hits for "netstat output", and I can't find an answer to this: What > does the "::ffff" mean in front of an IP address in the netstat > output? > Some lines list a connection and its state, with the "::ffff" in > front of the source and destination IP, and some list connections > without the "::ffff". I just want to know what the difference is > between the lines that have it and the lines that don't. ::ffff is the IPv6 prefix for an IPv4 address mapped into IPv6 space (something along those lines). -- the road to hell is paved with business decisions... these opinions are mine, all mine; HP might not want them anyway... :) feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...
From: Pascal Hambourg on 28 Jan 2010 06:50 Hello, Rick Jones a �crit : > Bennett Haselton <bennett(a)peacefire.org> wrote: >> When I run "netstat" on my machine I get some lines like: > >> tcp 0 0 ::ffff:69.72.177.140:80 ::ffff:<remote ip >> address> TIME_WAIT > > ::ffff is the IPv6 prefix for an IPv4 address mapped into IPv6 space > (something along those lines). And it means that it is an IPv6 socket that is used for IPv4 communication. Application and socket-wise, it is IPv6 but network and packet-wise it is IPv4. This is allowed as a transition mechanism if net.ipv6.bindv6only=0 and the application didn't set the socket option IPV6_V6ONLY. It seems that some recent OSes disable this option by default so that IPv6 sockets can handle only real IPv6 communications.
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