Ping google.com ipv6?

phoeneousphoeneous Go ping yourself...Member Posts: 2,333 ■■■■■■■□□□
I'm troubleshooting internet connectivity from one of my 2911's. I could've sworn just yesterday, a ping to google.com returned 74.125.224.232.

And today I get this:
2911#ping google.com
Translating "google.com"...domain server (10.0.0.2) [OK]
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2607:F8B0:400A:800::1006, timeout is 2 seconds:
% No valid source address for destination
Success rate is 0 percent (0/1)
2911#

Any ideas why it's attempting the ipv6 address? I don't have any ipv6 configs on the router.

Comments

  • networker050184networker050184 Mod Posts: 11,962 Mod
    Seems like it would be a problem with your name server.
    An expert is a man who has made all the mistakes which can be made.
  • log32log32 Users Awaiting Email Confirmation Posts: 217
    do ping -4 google.com
  • phoeneousphoeneous Go ping yourself... Member Posts: 2,333 ■■■■■■■□□□
    Seems like it would be a problem with your name server.


    That's what I originally thought but A)There is no ipv6 on the dns box and B)Three locations use the same dns box and only two are affected.

    I can hit the inside of my bgp neighboor but provider cannot hit outside interface pointing to their core.

    But how is it that all internal ip traffic that typically traverses the mpls is working but only internet is affected?
  • phoeneousphoeneous Go ping yourself... Member Posts: 2,333 ■■■■■■■□□□
    Dolev wrote: »
    do ping -4 google.com


    That didn't work, but ping ip google.com did.
  • networker050184networker050184 Mod Posts: 11,962 Mod
    What IOS are you on? IP should be the default as far as I know.
    An expert is a man who has made all the mistakes which can be made.
  • xXErebuSxXErebuS Member Posts: 230
    what do you get when you do a nslookup against your dns; what about when you do a nslookup against another DNS?
  • phoeneousphoeneous Go ping yourself... Member Posts: 2,333 ■■■■■■■□□□
    What IOS are you on? IP should be the default as far as I know.

    c2900-universalk9-mz.SPA.150-1.M4.bin

    And it's been that same image for months.
  • phoeneousphoeneous Go ping yourself... Member Posts: 2,333 ■■■■■■■□□□
    xXErebuS wrote: »
    what do you get when you do a nslookup against your dns; what about when you do a nslookup against another DNS?

    From a windows box? It resolves the name accordingly.
  • networker050184networker050184 Mod Posts: 11,962 Mod
    phoeneous wrote: »
    c2900-universalk9-mz.SPA.150-1.M4.bin

    And it's been that same image for months.

    So the router hasn't changed at all (assuming you didn't reconfigure it here) but the response its getting fro the DNS server has changed? I don't see how that could be something with the router....
    An expert is a man who has made all the mistakes which can be made.
  • xXErebuSxXErebuS Member Posts: 230
    phoeneous wrote: »
    From a windows box? It resolves the name accordingly.

    so when you do nslookup google.com 10.0.0.2 it sends back IPV4 address only?
  • phoeneousphoeneous Go ping yourself... Member Posts: 2,333 ■■■■■■■□□□
    So the router hasn't changed at all (assuming you didn't reconfigure it here) but the response its getting fro the DNS server has changed? I don't see how that could be something with the router....

    Because:

    1) Yesterday it was returning an ipv4 reply.
    2) 3 offices use that same box but only two sites are affected. All 3 of those offices are on the same mpls mesh.
    3) Of the 10 offices that we have on mpls, only the ones in a specific state are affected. All other national offices are fine.
    4) The dns box is w2k3 that is not running anything ipv6.
  • phoeneousphoeneous Go ping yourself... Member Posts: 2,333 ■■■■■■■□□□
    xXErebuS wrote: »
    so when you do nslookup google.com 10.0.0.2 it sends back IPV4 address only?


    That is correct.
    C:\user>nslookup google.com
    Server:  internal.dns.server
    Address:  10.0.0.2
    Non-authoritative answer:
    Name:    google.com
    Addresses:  173.194.33.9, 173.194.33.3, 173.194.33.8, 173.194.33.1
              173.194.33.14, 173.194.33.5, 173.194.33.2, 173.194.33.0, 173.194.33.7
              173.194.33.6, 173.194.33.4
    
  • MonkerzMonkerz Member Posts: 842
    Can you post the config of one of your 2911s?
  • phoeneousphoeneous Go ping yourself... Member Posts: 2,333 ■■■■■■■□□□
    Update:

    After some lengthy traceroute tests, I've discovered default route to internet is not correct for the affected sites. ISP has confirmed this. Looks like some of the CE's are not distributing the correct default-originate routes to the affected PE's.

    See, I knew I wasn't trippin!
Sign In or Register to comment.