while mucking around with reverse DNS for a /29 public netblock i use, i noticed that my ISP, SBC, had only aliased 6 of the 8 IPs in the /29 block for use with rDNS. after seeing this, i did a bit of homework and found graham toal's explanation of the "missing" IPs ( http://www.gtoal.com/subnet.html ) which presents this issue quite clearly. this did leave me with some additional questions though.
i have been hosting websites on these reserved boundary IPs in the /29 block with no trouble using binat. should i not be doing this since these are reserved IPs for broadcast? i have moved one domain from the boundary already since it needed rDNS setup. how regularly are these reserved broadcast addresses at the beginning and end of the netblock used and for what sorts of services? cheers, jake
