Re: [public-dns-discuss] Google Public DNS is not working since yesterday (21 Oct 2012)

[Yunhong Gu]

Hi, Woody

If you cannot "ping 8.8.8.8" either, probably there is a network issue
between your local ISP and our data resolvers. It is also possible
that 8.8.8.8 is being blocked/filtered in your local network.

From our side, we can ping 103.29.3.252, so the problem might have
been temporary.

Thanks,
Yunhong

On Sun, Oct 21, 2012 at 10:25 AM, Woody Poon <wcpo...@gmail.com> wrote:
> Dear Google,
>
> I'm facing a problem to using Google Public DNS in my network.
> Please find the server linux & BGP router traceroute results below,
>
> Step 1: Failed
> [root@localhost ~]# traceroute -n -w 2 -q 2 -m 30 8.8.8.8
> traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 40 byte packets
> 1 10.10.10.5 0.318 ms 0.211 ms
> 2 103.29.3.252 0.579 ms 0.545 ms
> 3 * *
> 4 * *
> 5 * *
> 6 * *
> 7 * *
> 8 * *
> 9 * *
> 10 * *
> 11 * *
> 12 * *
> 13 * *
> 14 * *
> 15 * *
> 16 * *
> 17 * *
> 18 * *
> 19 * *
> 20 * *
> 21 * *
> 22 * *
> 23 * *
> 24 * *
> 25 * *
> 26 * *
> 27 * *
> 28 * *
> 29 * *
> 30 * *
>
> Step 2: Failed
> [root@localhost ~]# dig @8.8.8.8 www.google.com.
>
> ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-16.P1.el5 <<>> @8.8.8.8 www.google.com.
> ; (1 server found)
> ;; global options: printcmd
> ;; connection timed out; no servers could be reached
>
> Step 3: Success with Level3's DNS Servers
> [root@WEB1 ~]# nslookup www.google.com. 4.2.2.1
> Server: 4.2.2.1
> Address: 4.2.2.1#53
>
> Non-authoritative answer:
> Name: www.google.com
> Address: 74.125.129.106
> Name: www.google.com
> Address: 74.125.129.103
> Name: www.google.com
> Address: 74.125.129.99
> Name: www.google.com
> Address: 74.125.129.105
> Name: www.google.com
> Address: 74.125.129.104
> Name: www.google.com
> Address: 74.125.129.147
>
> Before that, it is working fine, it is only happen since yesterday (20 Oct
> 2012).
> Really appreciate that if you guys can assist me on this issues.
>
> Looking forward to receive your reply.
>
> Thanks & Regards,
> Woody
>
> --
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[Yunhong Gu]

Hi, so far I only see an asymmetric routing  that could be problematic, though it may not be the cause of the problem. I will open an internal ticket to double check the routing (and correct it if necessary).

Yunhong

On Mon, Oct 22, 2012 at 11:24 AM, Woody Poon <wcpo...@gmail.com> wrote:

Hi Yun Hong,

This is my ping results from BGP router (103.29.3.252).

Router#ping ip

Target IP address: 8.8.8.8

Repeat count [5]: 100

Datagram size [100]:

Timeout in seconds [2]:

Extended commands [n]:

Sweep range of sizes [n]:

Type escape sequence to abort.

Sending 100, 100-byte ICMP Echos to 8.8.8.8, timeout is 2 seconds:

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Success rate is 100 percent (100/100), round-trip min/avg/max = 1/2/24 ms

Show ip route from BGP router 103.29.3.252

Router#show ip route 8.8.8.8

Routing entry for 8.8.8.0/24

  Known via "bgp 131299", distance 20, metric 0

  Tag 38322, type external

  Last update from 218.100.44.83 2d18h ago

  Routing Descriptor Blocks:

  * 218.100.44.83, from 218.100.44.83, 2d18h ago

      Route metric is 0, traffic share count is 1

      AS Hops 2

      Route tag 38322

      MPLS label: none

Telnet results from BGP router (103.29.3.252)

Router#telnet 8.8.8.8 53

Trying 8.8.8.8, 53 ...

% Connection timed out; remote host not responding

Traceroute results from my firewall

traceroute 8.8.8.8

traceroute to 8.8.8.8 (8.8.8.8), 32 hops max, 72 byte packets

1 103.29.3.252 0 ms 0 ms 0 ms

2 218.100.44.83 <packetone.myix.gov.my> 0 ms 0 ms 0 ms

3 122.255.114.234 9 ms 9 ms 9 ms

4 209.85.242.240 12 ms 12 ms 12 ms

5 209.85.241.173 7 ms 209.85.242.125 10 ms 8 ms

6 * * *

7 8.8.8.8 <google-public-dns-a.google.com> 12 ms 12 ms 7 ms

But I am not able to telnet 8.8.8.8 port 53 (DNS) from BGP router and Firewall.

Hope can get your advice on this issues.

Thanks & Regards,

Weng Chee

> public-dns-discuss+unsub...@googlegroups.com

> For more options, visit this group at
> http://groups.google.com/group/public-dns-discuss?hl=en
> For more information on Google Public DNS, please visit
> http://code.google.com/speed/public-dns
> ========================================================