Tag Archives: ipv6

ARP, GARP and IPv6 neighbor discovery

I would like to focus more on IPv6 on the upcoming posts and I think the best topic to start IPv6 is the discovery phase but before delving into IPv6, I need to write about how address resolution works in IPv4 world. I did read couple of RFCs as well so you may find something that you didn’t know before. I also touch on GARP and share my test results. Let’s start with the outline about what we will see on this post.

  • How does ARP work?
  • What is GARP and under what conditions we send this packet?
  • How does IPv6 neighbor discovery work?
  • We will use the following topology on these tests

    lab1020-arp-garp-ipv6-nd-topology
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How to enable IPV6 in SRX?

If you look at the following command’s output in an SRX device, you will possibly see the following output

As you can see Inet6 is dropped by default. To enable it issue the following command

If you commit this config change, you will be asked to reboot the device. Once reboot is done, output will change like below after which you can play with ipv6:)

PS: If your SRX isn’t in flow mode but packet mode instead, command should be as below to enable ipv6