Damir, (Cc: to the Routing WG list, since this might be of interest to more people).
as far as I can see on GARR border router (AS137) now we are receiving announcement for the two of four networks from block 192.87.108/22. Those which are explicitly annonced. So, we can't ping your machine 192.87.111.59 directly as there is no BGP entry for it neither for 192.87.109.0.
GARR-gw.cnr.it#sh ip bgp 192.87.111.0 % Network not in table GARR-gw.cnr.it#sh ip bgp 192.87.109.0 % Network not in table
This is exactly where the fun part is. SURFnet is current announcing 192.87.108.0 and 192.87.110.0 as single class C networks. Furthermore, SURFnet is announcing 192.87.108.0/22 as a CIDR route. Whether or not, you are receiving CIDR routes (which means talking BGP4 in the first place) you should be able to reach 192.87.108.0 and 192.87.110.0, since they are announced explicitly. Your capability to reach 192.87.109.0 (not used at the moment) and 192.87.111.0 (in which my laptoy is living) is fully depending on your ability to interpret the CIDR routes received. As soon as CIDR is fully deployed SURFnet will remove the explicit announcements of 192.87.108.0 and 192.87.110.0 and only advertise 192.87.108.0/22. I read from your message that you are not able to ping (or prtraceroute) to my laptoy. Where are you defaulting to? __ Erik-Jan.