it would be nice if the router implemented some of the traditional ICMP messages for gateways and routers: - ICMP destination unreachable - ping requests to its own interfaces - timestamp requests - TTL expired (would require OpenFlow support for sure) and others as discussed in http://tools.ietf.org/html/rfc1812, http://tools.ietf.org/html/rfc1122 Note: this issue is NOT about support for ICMP traffic in the NAT. it is about the router itself issuing ICMP messages.
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