slirp version 1.0i
Source
Improvements
-  Fixed ip fragmentation and reassembly code
-  Added ICMP support for bad IP packets
-  Improved ICMP echo request handling, "Network unreachable" is returned
     if the packet could not be routed
-  Full ICMP support for UDP traffic, "Network unreachable" and "Port
     unreachable"
-  Partial ICMP support for TCP traffic, "Network unreachable" and "Port 
     unreachable"