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I am developing an IPv6 network device driver. It should behaviors like a router, i.e. send router advertisement regularly. But now my device is working like a node, send router solicitation. What should I do to change it to a router? Thanks.

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The Linux kernel does not know how to send router advertisements; it relies on a userspace daemon for that. You'll want to install and configure radvd, the Router Advertisement Daemon. http://tomicki.net/ipv6.router.php is a pretty good tutorial on what you need to do.

Setting the sysctl net.ipv6.conf.all.forwarding = 1 will disable the router solicitations (but will not produce router advertisements). This setting is also necessary to run radvd.

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