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Equivalent of GARP in IPv6

+1 vote
432 views

Is there any tool by which i can send an unsolicited Neighbour advertisement for an IPv6 address.

My purpose is to advertise the new MAC address in a High availability setup for a given virtual address in case of a switchover from one Node to another.

posted Apr 22, 2013 by Prem Chaitanya Prathi

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1 Answer

0 votes

I've been investigating this too. So called Unsolicited Neighbor Advertisements are still required with NDP, see:
http://tools.ietf.org/html/rfc2461#section-7.2.6
On Debian based systems you can use ndsend which you can install as follows:

apt-get install vzctl7

Centos should have similar yum installation.

answer Apr 23, 2013 by Salil Agrawal
on ubuntu it is -
yum install vzctl
Similar Questions
+3 votes

When I read wiki , its written like this

As of 6 February 2010, multihoming in the next-generation Internet Protocol (IPv6) 
was not yet standardized

Is it supported now ?

+3 votes

Is IPv6 a must for LTE? Can we have a device supporting only IPv4 or can operator launch a service with IPV4 support?

0 votes

I usually have some default rules in place on all nodes which look about like this:

-A INPUT --in-interface lo -j ACCEPT
-A OUTPUT --out-interface lo -j ACCEPT

-A INPUT -m state --state UNTRACKED -j DROP
-A FORWARD -m state --state UNTRACKED -j DROP
-A OUTPUT -m state --state UNTRACKED -j DROP

-A INPUT -m state --state INVALID -j DROP
-A FORWARD -m state --state INVALID -j DROP
-A OUTPUT -m state --state INVALID -j DROP

#handle IPsec only sources/destinations
#snip/snap

#allow incoming packets for all established and all related connections
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

#allow incoming ICMP packets
-A INPUT --protocol icmpv6 -j ACCEPT

And the same for IPv4.

The idea with dropping the UNTRACKED/INVALID was that such packages are probably not good fellows and should stay out...

Okay... now with IPv4 everything works as expected...

But with v6 nothing works at all and I get Destination unreachable (even on pings)... I can't even reach the gateway.

When I disable dropping the untracked packets... it starts working,..even when afterwards I enable it again.
Seems that there is some connection between the host an the gateway shown then by conntrack.

Now... question is why?

0 votes

I have a kvm host and I try to install a centos 6 guest with a static ip address.

When I do a manual install I eventually get to the network configuration and if I enter IP, gateway and DNS Server I can ping6 the guest from the host and I can ping6 the guest from outside.

I do not want to do manual installation, so I have to specify a url to a kickstart file, but to download it the network must be configured. I try some kernel options

noipv4 ipv6=... gateway=... dns=... ks=http…

This gets me so far that I can ping6 the guest from the host, but I can not reach it from outside. When I ping from outside I see the guest sending neighbor solicitation requests for the IP I ping from, but this IP is in another network. I think the guest does not get a gateway configured. At least the ipv6 option is working, because I can ping the guest from the host.

How do I achieve such a ipv6 only with static network configuration kickstart install? How to specify ipv6 gateway (and possibly dns)


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