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With the command like these the following you can add neighbor proxies in Linux

ip -6 neigh add proxy 2001:db8:100:3022:1::4 dev eth0

Is there a way how to list which proxies have already been defined?

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up vote 4 down vote accepted

Try with:

ip -6 neigh show proxy

It works for me:

emily ~ # ip -6 neigh add proxy 2001:db8:100:3022:1::4 dev eth0
emily ~ # ip -6 neigh show proxy
2001:db8:100:3022:1::4 dev eth0  proxy
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On some distribution "ip -6 neigh show proxy" doesn't work but your can see the corresponding multicast address to be answered :

ip -6 maddr show
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