- ICMP Echo and Echo reply packets mangled the ICMP checksum when no
mangling was needed.
- Other ICMP message types may still be wrong since they potentially contain
IP header information that may or may not need IP addresses manipulated
- Increased the ARP table size from 8 to 64 since the ARP RFC (826) suggests
that ARP info from all received ARP packets be gathered as ARP broadcasts
are received. A normal LAN can easily blow over an 8 entry ARP table.