I don't know what you mean by "lwIP tun ARP table", lwIP is oblivious to
I guess you have an lwIP port running in a Linux machine, "connected" to
a tun/tap interface.
If you want to see the lwIP ARP table you go one place (e.g:
src/core/ipv4/etharp.c and discover the existence of static struct
etharp_entry arp_table[ARP_TABLE_SIZE];), if you want to see Linux ARP
table for that tun/tap interface, you go other place (e.g.: Google, and
discover that if you have procfs you can grep tun0 /proc/net/arp;
assuming 'tun0' is the name of the interface).
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