DNS Issues Technicolor TG582n
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- Re: DNS Issues Technicolor TG582n
DNS Issues Technicolor TG582n
13-03-2014 11:08 PM
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It appears that DNS names are not resolving.
Currently all the LAN devices use DHCP to return a DNS Server address of 192.168.1.1 (the router)
The router then acts as a DNS relay to
Primary DNS: 212.159.6.9
Secondary DNS: 212.159.6.10
However DNS names are not resolving anymore.
If I change a PC to have 192.168.1.1 & 212.159.6.10 it does seem to (at least sometimes) resolve DNS
What has changed to break the DNS relay function of my PlusNet supplied router???
Thanks in advance
Nivag
Re: DNS Issues Technicolor TG582n
13-03-2014 11:13 PM
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Server: UnKnown
Address: 192.168.1.1
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
*** Request to UnKnown timed-out
Very odd.
nslookup www.yahoo.com 212.159.6.10
Server: cdns02.plus.net
Address: 212.159.6.10
Non-authoritative answer:
Name: ds-eu-fp3.wa1.b.yahoo.com
Addresses: 2a00:1288:f006:1fe::3000
2a00:1288:f00e:1fe::3001
2a00:1288:f006:1fe::3001
2a00:1288:f00e:1fe::3000
46.228.47.115
46.228.47.114
Aliases: www.yahoo.com
fd-fp3.wg1.b.yahoo.com
ds-fp3.wg1.b.yahoo.com
ds-eu-fp3-lfb.wa1.b.yahoo.com
Router looks fine...
Connection Information
Uptime: 0 days, 0:49:46
Data Transferred (Sent/Received) [MB/GB]: 187.75 / 7.66
Username: XXXXXX@plusdsl.net
Password: ********
Remember Password: Yes
IP Address: AAA.BBB.CCC.DDD
Primary DNS: 212.159.6.9
Secondary DNS: 212.159.6.10
Looks OK
Just DNS via 192.168.1.1 that is broken
Re: DNS Issues Technicolor TG582n
13-03-2014 11:21 PM
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nslookup www.yahoo.com 192.168.1.1
Server: UnKnown
Address: 192.168.1.1
Non-authoritative answer:
Name: ds-eu-fp3.wa1.b.yahoo.com
Addresses: 2a00:1288:f006:1fe::3001
2a00:1288:f00e:1fe::3000
2a00:1288:f00e:1fe::3001
2a00:1288:f006:1fe::3000
46.228.47.114
46.228.47.115
Aliases: www.yahoo.com
fd-fp3.wg1.b.yahoo.com
ds-fp3.wg1.b.yahoo.com
ds-eu-fp3-lfb.wa1.b.yahoo.com
Are there system wide DNS issues at present???
Re: DNS Issues Technicolor TG582n
14-03-2014 6:20 AM
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https://community.plus.net/forum/index.php/topic,122856.msg1083269.html#msg1083269
https://community.plus.net/forum/index.php/topic,116178.0.html
I don't think anyone knows the exact cause of the problem or if 212.159.6.9 being slow to respond, or packets being lost to the way to/from 212.159.6.9 might have anything to do with the problem.
It is possible to configure the router's DHCP server to assign different DNS server addresses to devices on your network: http://npr.me.uk/changedns.html "Method 2" to workaround the problem.
Re: DNS Issues Technicolor TG582n
14-03-2014 10:46 AM
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The dozen or so popular servers i've tested below seem fine today, the test below sends 10 requests to google.com and uses 5 of those requests to give the results you see below for each server.
[tt]Nameserver Response Time (ms)
min/avg/max/stdev/retries
192.168.0.15 0.55/0.56/0.56/0.00/0
192.168.0.254 19.41/19.88/20.27/0.29/0
212.159.6.9 19.32/19.51/19.60/0.10/0
212.159.6.10 18.57/19.51/20.79/0.86/0
212.159.13.49 18.51/19.34/20.24/0.62/0
212.159.13.50 18.35/19.22/19.98/0.68/0
208.67.222.222 17.98/18.27/18.43/0.17/0
208.67.222.220 17.96/18.41/18.78/0.26/0
208.67.222.123 18.19/18.37/18.66/0.17/0
208.67.220.123 17.94/18.27/18.69/0.26/0
8.8.8.8 23.23/24.04/25.18/0.69/0
8.8.4.4 17.53/17.89/18.28/0.31/0
4.2.2.1 17.68/18.17/18.73/0.44/0
4.2.2.6 17.69/18.23/18.58/0.30/0
The following name servers are used for lookup of google.co.uk.
forwarding request:
Delegation with 0 names, of which 0 can be examined to query further addresses.
It provides 2 IP addresses.
208.67.222.123 rto 53 msec, ttl 116, ping 25 var 7 rtt 53, tA 0, tAAAA 0, tother 0, EDNS 0 probed.
208.67.220.123 rto 44 msec, ttl 192, ping 24 var 5 rtt 50, tA 0, tAAAA 0, tother 0, EDNS 0 probed.[/tt]
The test above is just giving me a gerneral thumbs up that all is well with my normal Opendns servers that i use via my cache.
And the 2 tests below are samples taken in the last hour, they also test the 20 or so dns-servers with about 200 global requests each.
As you can see Level3 has a few requests failing, but nothing major in all honesty.
ejs has pointed out that a few people have had problems with the TG582N forwarder, but nothing conclusive has been proved. One way of solving your problem NivagSwerdna is by disabling the forwarder as ejs has pointed out, although that option does work, it doesn't work for me because i need to force the route for dns traffic through the forwarder. IE for Opendns.
Re: DNS Issues Technicolor TG582n
14-03-2014 7:22 PM
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Anyway...
Got home today to loads of grumbles from the family... nothing accessible again... DNS resolution down again...
Once again....
nslookup www.yahoo.com 192.168.1.1
Server: UnKnown
Address: 192.168.1.1
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
*** Request to UnKnown timed-out
but
nslookup www.yahoo.com 212.159.6.9
Server: cdns01.plus.net
Address: 212.159.6.9
Non-authoritative answer:
Name: ds-eu-fp3.wa1.b.yahoo.com
Addresses: 2a00:1288:f00e:1fe::3000
2a00:1288:f006:1fe::3000
2a00:1288:f00e:1fe::3001
2a00:1288:f006:1fe::3001
46.228.47.115
46.228.47.114
Aliases: www.yahoo.com
fd-fp3.wg1.b.yahoo.com
ds-fp3.wg1.b.yahoo.com
ds-eu-fp3-lfb.wa1.b.yahoo.com
Clearly the DNS relay in the technicolor (stock Plusnet router) stuffed again.
Decided to have a closer look...
{admin}[dns server route]=>list
DNS Server Entries:
DNS Server Source Label Metric Intf State Domain
D 212.159.6.9 10 Internet UP *
D 212.159.6.10 10 Internet UP *
Not sure what the "D" on the front of the line means but it doesn't look healthy
{admin}[dns server route]=>flush
{admin}[dns server route]=>add dns=212.159.6.10 metric=0 intf=Internet
{admin}[dns server route]=>add dns=212.159.6.9 metric=0 intf=Internet
{admin}[dns server route]=>list
DNS Server Entries:
DNS Server Source Label Metric Intf State Domain
S 212.159.6.10 0 Internet UP *
S 212.159.6.9 0 Internet UP *
{admin}[dns server route]=>
And then back to the PC...
nslookup www.yahoo.com 192.168.1.1
Server: UnKnown
Address: 192.168.1.1
Non-authoritative answer:
Name: ds-eu-fp3.wa1.b.yahoo.com
Addresses: 2a00:1288:f006:1fe::3000
2a00:1288:f006:1fe::3001
2a00:1288:f00e:1fe::3000
2a00:1288:f00e:1fe::3001
46.228.47.114
46.228.47.115
77.238.160.51
Aliases: www.yahoo.com
fd-fp3.wg1.b.yahoo.com
ds-fp3.wg1.b.yahoo.com
ds-eu-fp3-lfb.wa1.b.yahoo.com
Working again for now. I don't imagine I'm the only person suffering this. What has changed?
Re: DNS Issues Technicolor TG582n
14-03-2014 8:40 PM
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dhcp server pool list name=LAN_private
Re: DNS Issues Technicolor TG582n
14-03-2014 8:41 PM
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20 mins in... silence...
Come down stairs to find....
nslookup www.yahoo.com 192.168.1.1
Server: UnKnown
Address: 192.168.1.1
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
*** Request to UnKnown timed-out
{admin}[dns server route]=>list
DNS Server Entries:
DNS Server Source Label Metric Intf State Domain
S 212.159.6.10 0 Internet UP *
S 212.159.6.9 0 Internet UP *
So router appears normal... And has not dropped (Uptime: 0 days, 3:58:59)
Did
{admin}[dns server route]=>flush
{admin}[dns server route]=>add dns=212.159.6.10 metric=0 intf=Internet
{admin}[dns server route]=>add dns=212.159.6.9 metric=0 intf=Internet
{admin}[dns server route]=>list
DNS Server Entries:
DNS Server Source Label Metric Intf State Domain
S 212.159.6.10 0 Internet UP *
S 212.159.6.9 0 Internet UP *
{admin}[dns server route]=>
And temporarily working again. Something causing the Technicolor Router DNS to go deaf.
There are some disconcerting things in the logs....
Mar 14 20:30:18 IDS scan parser : tcp port scan: 173.194.41.161 scanned at least 10 ports at A.B.C.D. (1 of 1) : 173.194.41.161 A.B.C.D 0040 TCP 443->55150 [...R..] seq 1069446595 win 0
and lots of...
Mar 14 18:16:14 FIREWALL replay check (1 of 1): Protocol: ICMP Src ip: 178.44.133.228 Dst ip: A.B.C.D Type: Destination Unreachable Code: Port Unreacheable
Re: DNS Issues Technicolor TG582n
14-03-2014 8:44 PM
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{admin}=>dhcp server pool list name=LAN_private
Pool Address Range Intf Admin Alloc State
0 LAN_private 192.168.1.[201-252] LocalNetwork up dynamic static
DHCP server = 192.168.1.1
Netmask = 255.255.255.0
Leasetime = 86400s
Lockouttime = 180s
Gateway = 192.168.1.1
DNS domain = myDomain.com
DNS address list:
192.168.1.1 (local DNS)
{admin}=>
Looks fine
Re: DNS Issues Technicolor TG582n
14-03-2014 8:54 PM
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{admin}[dns server debug]=>stats
Corrupted packets received : 30075
Local questions resolved : 0
Local negative answers sent : 312
Total DNS packets forwarded : 32591
External answers received : 4240
Spoofed responses : 212
Forward table full, discard : 98
Spurious answers : 954
Unknown query types : 0
I'll reset stats and see if these are current.
Re: DNS Issues Technicolor TG582n
14-03-2014 9:02 PM
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Anything ending with a 1st level domain seems a bad idea to me.
Try reverting to "lan" or just "mydomain"
Re: DNS Issues Technicolor TG582n
14-03-2014 11:14 PM
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{admin}[dns server debug]=>stats
Corrupted packets received : 10672
Local questions resolved : 0
Local negative answers sent : 6
Total DNS packets forwarded : 9544
External answers received : 1968
Spoofed responses : 39
Forward table full, discard : 11
Spurious answers : 58
Unknown query types : 0
{admin}[dns server debug]=>
Re: DNS Issues Technicolor TG582n
14-03-2014 11:23 PM
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Re: DNS Issues Technicolor TG582n
15-03-2014 11:39 AM
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{admin}[dns server debug]=>stats
Corrupted packets received : 46177
Local questions resolved : 0
Local negative answers sent : 104
Total DNS packets forwarded : 4670
External answers received : 6459
Spoofed responses : 42
Forward table full, discard : 989
Spurious answers : 1385
Unknown query types : 0
{admin}[dns server debug]=>
So giving up on the Technicolor for a few days and just hardcoding 212.159.6.9 as DNS server
Something isn't right at all.... Maybe someone is spoofing DNS?
Re: DNS Issues Technicolor TG582n
15-03-2014 12:16 PM
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{admin}=>:connection list ip=192.168.1.1
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