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This disallows setting /proc/sys/net/ipv6/conf/*/router_solicitations to values below -1. -1 continues to mean an unlimited number of retransmits. Note: this depends on 'ipv6 addrconf: remove addrconf_sysctl_hop_limit()' Signed-off-by: Maciej Żenczykowski <maze@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>