Hoi Marc, [email protected] here :)
On Mon, Jan 4, 2010 at 9:02 PM, Marc SCHAEFER <[email protected]> wrote: > Hi, > > It seems the Swiss POP for sixxs (IPv6 connectivity) is unreachable > from Cablecom (net2000), Sunrise ADSL, Bluewin ADSL, but is reachable > from Green ADSL. It is unreachable for any ISP which does not peer with IP-Man at TIX or CIXP (or other exchanges like AMS-IX and SFINX). See below for rationale. > It used to be reachable in november 2009 when I did my last tests, on > Cablecom (net2000). > Does anyone has an idea why it is not routed correctly ? I beg to differ an opinion: it is routed correctly. :) > Is this because it's a lone /24, and most providers don't peer correctly > for less than /22 ? An administrative problem (like when EUnet was > routed through Amsterdam for SWITCH customers -- well at least > it was routed!) It's not an administrative problem, it's a purposeful configuration. > Or is it because IP-MAN wants direct peering and doesn't announce the > prefix globally ? This is the reason - it is only announced to peers, not to transit providers. One obvious way to reach it is to start peering with IP-Man at one of the IXPs at which they are present. I, too, am a cablecom subscriber and I do not have access to the machines either from home - I have to hop over to another network first, one that peers with IP-Man. > Maybe to avoid being charged by strange peering plans ? Well, it's to avoid being DDoSed to hell and back[tm]. There is an EFnet server (irc.efnet.ch) and an IRCnet server (ircnet.ipng.ch) and a well known tunnelbroker (chzrh01.sixxs.net) in that /24 - and all of them are packet magnets, unfortunately :( > PS: I am especially interested because I am considering to route a old /24 > from a /15 (allocation unspecified) somehow, and want to see if it is > really usually unfeasible from a global routing perspective, or > from the practical quirks of commercial operators today. I can confirm (as owner of that /24) that there was never a problem announcing it, and it used to be globally visible. Now, it is in a gray area, and purposefully not visible worldwide. If you have a /24 you should be generally accepted by most every ISP out there, as far as breaking aggregation of your /15, I cannot comment (but I say: go for it) groet, Pim -- Pim van Pelt <[email protected]> PBVP1-RIPE - http://www.ipng.nl/ _______________________________________________ swinog mailing list [email protected] http://lists.swinog.ch/cgi-bin/mailman/listinfo/swinog
