Re: Why Router Advertisement are dropped when in forwarding mode?

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So, do you agree that in forwarding mode not all RAs must be
dropped by kernel?

For the moment the drop condition is (net/ipv6ndisc.c#L1095):

   if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra) {

Don't you think we should change this?

No. You can install a filter and process them in user-space, like radvd does.

What are you trying to do?

-Brian
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