Traceroute prior to V2.9.0 would sequentially send packets to individual TTLs, wait for replies, and then go on. Traceroute V2.9.1 can send in parallel, and is therefore much quicker. (O(1) instead of O(n) for the math purists.) ftp://ftp.aces.com/pub/software/traceroute/beta/ traceroute.c 0_readme.txt If a gui ftp server gives you troubles, use a real one. As always, if you get it to build and run on a system not listed in the table (in the 0_readme.txt file) let me know the compile arguments and system/compiler versions. Cheers, Ehud