November 2007
Beginner
642 pages
15h 43m
English
Content preview from Linux Networking CookbookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
15.2. Pinging Link Local IPv6 Hosts
Problem
You want to start with the basics—testing your IPv6 connectivity with ping. Can you even do this?
Solution
Of course you can, with the ping6 command, which should be included in all modern Linux distributions. This is how you ping6 localhost, and your Link Local addresses:
$ ping6 -c2 ::1PING ::1(::1) 56 data bytes 64 bytes from ::1: icmp_seq=1 ttl=64 time=0.045 ms 64 bytes from ::1: icmp_seq=2 ttl=64 time=0.048 ms --- ::1 ping statistics -- 2 packets transmitted, 2 received, 0% packet loss, time 1002ms rtt min/avg/max/mdev = 0.045/0.046/0.048/0.007 ms$ ping6 -c2 -I eth0 fe80::203:6dff:fe00:83cfPING fe80::203:6dff:fe00:83cf(fe80::203:6dff:fe00:83cf) from fe80::203:6dff:fe00:83cf eth0: 56 data bytes 64 bytes from fe80::203:6dff:fe00:83cf: icmp_seq=1 ttl=64 time=0.046 ms 64 bytes from fe80::203:6dff:fe00:83cf: icmp_seq=2 ttl=64 time=0.051 ms --- fe80::203:6dff:fe00:83cf ping statistics -- 2 packets transmitted, 2 received, 0% packet loss, time 999ms rtt min/avg/max/mdev = 0.046/0.048/0.051/0.007 ms
When you ping6 the link local address, you must specify your network interface with the -I switch, even if you have only a single interface on your system. If you don't do this, you'll get a "connect: Invalid argument" error.
Now, how about pinging other hosts on your LAN? First, you must discover them by pinging the Link Local Multicast address:
$ ping6 -I eth1 ff02::1 PING ff02::1(ff02::1) from fe80::203:6dff:fe00:83cf eth0: 56 data bytes 64 bytes ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.