Regular Visitor
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4 Messages
Xfinity DNS Resolution Intermittently Fails 3x a Day
Greetings Friends.
I have Gigabit xFi services with Comcast. New Router and a great signal. No Packet loss.
For the last year, DNS resolution fails against the IPv4 Xfinity DNS servers - the DNS servers issued to my gateway by Xfinity and which propagates to my internal devices by DHCP. I can ping specific IP addresses with little to zero packet loss, but can't resolve any domain names. A gateway reboot fixes the problem, but this can't possibly be a permanent fix.
Here is an example.
XXXX is removing personal data Looks good, right? Let's try resolving against Xfinity issued DNS. Let's ping google first to make sure the connection is up through..... Let's try nslookup.... Let's try a secondary non-xfinity dns server. Specifically, Google's DNS server at 8.8.8.8 Hmmm.. that worked just fine. If I had to guess, the Xfinity DNS servers are not unable to authenticate my connection as a valid user and denies the query. Why it suddenly works on a reboot is beyond me. These are the results after a gateway reboot / reset. Happens 3 times a day and the only resolution is a GW reboot. I've called tech support 2 dozen times, had techs to the house over a dozen times. Layer 1 (Physical) is great. Strong signal and no packet loss. Tech support will not transfer me to Level 2 Advanced Services support as they can't see the issue from their end. The GW is up and responding. They said once the internet is back up, they have to close the ticket. Help!C:\Users\XXXX>ipconfig /all
Windows IP Configuration
Host Name . . . . . . . . . . . . : XXXXX
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : hsd1.ca.comcast.net
Wireless LAN adapter Wi-Fi:
Connection-specific DNS Suffix . : hsd1.ca.comcast.net
Description . . . . . . . . . . . : Marvell AVASTAR Wireless-AC Network Controller
Physical Address. . . . . . . . . : XXXX
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : XXXX
Lease Obtained. . . . . . . . . . : Friday, November 22, 2019 8:07:05 AM
Lease Expires . . . . . . . . . . : Thursday, November 28, 2019 11:19:16 PM
IPv6 Address. . . . . . . . . . . : XXXX
Temporary IPv6 Address. . . . . . : XXXX
Link-local IPv6 Address . . . . . : XXXX
IPv4 Address. . . . . . . . . . . : XXXX
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Friday, November 22, 2019 8:07:03 AM
Lease Expires . . . . . . . . . . : Saturday, November 30, 2019 11:06:02 AM
Default Gateway . . . . . . . . . : XXXX
10.0.0.1
DHCP Server . . . . . . . . . . . : 10.0.0.1
DHCPv6 IAID . . . . . . . . . . . : XXXX
DHCPv6 Client DUID. . . . . . . . : XXXX
DNS Servers . . . . . . . . . . . : 2001:558:feed::1
2001:558:feed::2
75.75.75.75
75.75.76.76
2001:558:feed::1
2001:558:feed::2
NetBIOS over Tcpip. . . . . . . . : Enabled
Microsoft Windows [Version 10.0.18362.476]
(c) 2019 Microsoft Corporation. All rights reserved.
C:\Users\XXXX>ping 8.8.8.8
Pinging 8.8.8.8 with 32 bytes of data:
Reply from 8.8.8.8: bytes=32 time=15ms TTL=54
Reply from 8.8.8.8: bytes=32 time=13ms TTL=54
Reply from 8.8.8.8: bytes=32 time=13ms TTL=54
Ping statistics for 8.8.8.8:
Packets: Sent = 3, Received = 3, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 13ms, Maximum = 15ms, Average = 13ms
Control-C
^C
C:\Users\XXXX>ping google.com
Ping request could not find host google.com. Please check the name and try again.
C:\Users\XXXX>nslookup google.com
Server: UnKnown
Address: 2001:558:feed::1
*** UnKnown can't find google.com: Query refused
C:\Users\XXXX>nslookup
Default Server: cdns01.comcast.net
Address: 2001:558:feed::1
> server 8.8.8.8
Default Server: dns.google
Address: 8.8.8.8
> cnn.com
Server: dns.google
Address: 8.8.8.8
Non-authoritative answer:
Name: cnn.com
Addresses: 2a04:4e42:200::323
2a04:4e42:400::323
2a04:4e42:600::323
2a04:4e42::323
151.101.65.67
151.101.129.67
151.101.193.67
151.101.1.67
C:\Users\XXXX>nslookup
Default Server: cdns01.comcast.net
Address: 2001:558:feed::1
> cnn.com
Server: cdns01.comcast.net
Address: 2001:558:feed::1
Non-authoritative answer:
Name: cnn.com
Addresses: 2a04:4e42:200::323
2a04:4e42:400::323
2a04:4e42:600::323
2a04:4e42::323
151.101.193.67
151.101.129.67
151.101.1.67
151.101.65.67
> google.com
Server: cdns01.comcast.net
Address: 2001:558:feed::1
Non-authoritative answer:
Name: google.com
Addresses: 2607:f8b0:4005:80b::200e
172.217.6.46
Rtd2
Regular Visitor
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4 Messages
5 years ago
Obviously, this is what's seen in the browser but thought I would post anyway.
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