It's pretty common and accepted. While not maybe the absolute best practise as it does break things like pmtu discovery, it still works. It's a recurring (every 2-3 months) question on NANOG, so you could probably do a search on their list archives (www.nanog.org -> mailing list) and you'll see the flame wars about it for say, the last 8 years or so... As far as Telstraclear using it in your traceroute below, they're certainly not the only carrier or isp in NZ doing so. aj
Hi Folks,
I am wondering about the etiquette of reporting RFC1918 addresses back to hosts performing a traceroute. Example below:
Hostname 1. ourhost.ourprovider.net.nz 2. f3-0-2.core1.wlg.ourprovider.net.nz 3. f0-0-4.core3.wlg.ourprovider.net.nz 4. f4-0-5.core2.akl.ourprovider.net.nz 5. g1-0-1396.u12.brfd.otherprovider.net.nz 6. g1-0-1043.u12.brh.otherprovider.net.nz 7. 10.65.32.1 8. 10.65.32.250 9. 10.69.0.2 10. a12-3-23.u21.tar.otherprovider.net.nz 11. fa7-4-1042.bigrouter.otherprovider.net.nz 12. otherhost.otherprovider.net.nz
Any comments on this practice?
Cheers,
Jon
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