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[lwip-devel] [bug #56925] Functions to obtain effective reachability (AR

From: Simon Arlott
Subject: [lwip-devel] [bug #56925] Functions to obtain effective reachability (ARP or NDP) status of an IP address
Date: Fri, 20 Sep 2019 17:09:57 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0

Follow-up Comment #1, bug #56925 (project lwip):

This is what I'm currently doing to check reachability:

(Ignore the IPv6 "have_address" check, I know it's not strictly correct.)

For IPv4, I'm retrying ARP requests more frequently than lwIP would.

For IPv6, the call to nd6_get_next_hop_addr_or_queue() will be returning an
error when it tries to queue the packet because the buffer is NULL.

A simple reachability check function would avoid these problems.


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