[atlas] IPv6 and Atlas probe v3
Mike. the.lists at mgm51.com
Tue Jul 16 17:23:56 CEST 2013
My probe works fine on IPv4, obtaining IP address, router, and DNS servers via DCHP. The IPv6 capability has me curious with two questions... I statically configured the IPv6 address via the web interface. I gave the probe an IPv6 address from my prefix, a gateway address, and the IP address of a DNS recursive server provided by my tunnel vendor. The IPv6 address shows up OK on the web interface ("Internet Address") The AS Number also shows up fine. The Gateway is "Undetermined/Unknown" The IP addr of the DNS server is listed as shown below. In the text table below the configuration info, I see: ("V" is a check, "X" is an X) Static Enabled Probe Knows Probe Uses Last Static Address Given IPv6 V V V 2001:470:xxx:xxx::xxx DNS V V X 2001:470:20::2 Question #1: Why is there an "X" for DNS in the "Probe Uses" column? Is there something wrong with that DNS server? When I query DNS from another box on the same subnet as the Atlas probe I get valid results: ; <<>> DiG 9.8.3-P4 <<>> @2001:470:20::2 atlas.ripe.net any ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 19739 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;atlas.ripe.net. IN ANY ;; ANSWER SECTION: atlas.ripe.net. 5922 IN AAAA 2a01:4f8:121:30a3::78:16 atlas.ripe.net. 5911 IN A 22.214.171.124 ;; Query time: 21 msec ;; SERVER: 2001:470:20::2#53(2001:470:20::2) ;; WHEN: Mon Jul 8 12:24:01 2013 ;; MSG SIZE rcvd: 76 I also noticed this sentence at the bottom of the https://atlas.ripe.net/doc/static-config page: "...As of now, we have no way of preventing the probe from accepting RAs. So if there is an IPv6 (rogue) RA on you network, it can/will override part of the static configuration. We're unsure if this will change in the future. ..." I do have RA support on the subnet, though I would not classify it as "rogue". :) The RA provides the IPv6 prefix, prefix length, and the IPv6 address of the recursive DNS server. This RA support has been used by another box on the subnet, and it seems to work fine. Question #2: Does the Atlas v3 probe use RA if they are present? Thanks.