Ghanan Gowripalan comments

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                                            Ghanan Gowripalan

Allow packet forwarding with address-less interfaces

This change needs tests, see `stack_test.go` and `tests/integration/forward_test.go` for examples

Dont depend on loopback LinkEndpoint for looping

basically we loop-back traffic destined to loopback address at the link endpoint (loopback.Endpoint), but im proposing looping it back at the network layer. Right now, we don't allow network layer...

Add support for ipv4 DAD and gratuitous ARP

still need to handle gratuitous arp

track all trackable connections (UDP/ICMP/etc.)

Still need to track ICMP echo (ping) packets

Do not assume buffer.View boundaries for packet headers

#2313 helps achieve this

packet buffer headers should have protocol number associated.

This is done - packet buffers hold the network/transport protocol numbers

ICMP bind errors do not match Linux

We also return EADDRNOTAVAIL instead of EINVAL when binding to multicast addresses