Dynamic DNS intermittent failures

J

jmawhorter

New Member
Hello,

I'm using ez-ipupdate to update a dynamic IP address for my domain. Today it seems to be intermittently failing where it worked before with the same config before.

Command is:

ez-ipupdate --config=/etc/ez-ipupdate/default.conf --address 0.0.0.0 (where 0.0.0.0 can be replaced with an actual IP)

Error messages vary but these are examples:

Copyright (C) 1998-2001 Angus Mackay
connected to dynamic.zoneedit.com (64.68.198.48) on port 80
unknown return code: 500
server response: Internal Server Error

ez-ipupdate Version 3.0.11b8
Copyright (C) 1998-2001 Angus Mackay
connect: Connection timed out
error connecting to dynamic.zoneedit.com:80

ez-ipupdate Version 3.0.11b8
Copyright (C) 1998-2001 Angus Mackay
connected to dynamic.zoneedit.com (64.68.198.48) on port 80
error recv()ing reply: Connection reset by peer
strange server response, are you connecting to the right server?


ez-ipupdate is being run on an Amazon AWS EC2 VPS so network connectivity should not be an issue on my end. The VPS is having no known issues connecting to other services.
 
sandy

sandy

Administrator
Staff member
what IP are you connecting from and please send in the conf file you reusing for ez-ipupdate, that should be helpful..., about updating that host to 8.8.8.8, thats a but of a mystery where you doing anything in particular while testing to get that?

thanks
sandy
 
J

jmawhorter

New Member
The IP I'm connecting from is dynamically assigned. At the moment it is : ec2-35-167-94-122.us-west-2.compute.amazonaws.com . I updated to 8.8.8.8 as part of my testing. My concern is that the client is failing to connect or getting odd responses back from your server as best I can tell some of the time. Some of the time it seems to work.

Here is the config file. For obvious reasons I've removed the AUTH token but it is correct and has not been changed.

service-type=zoneedit
#server=(default)
user=jmawhorter:******************
host=vpnserver.mawhorter.org
interface=
#wildcard
#mx=(none)
run-as-user=ez-ipupd
cache-file=/var/cache/ez-ipupdate/default-cache
#daemon

### Changes below this line will be preserved on upgrades.
address=`curl -s http://169.254.169.254/latest/meta-data/public-ipv4`
 
J

jmawhorter

New Member
Any update on this? It seems to still be a problem today and is making the dynamic DNS service pretty much useless. I could just use another free dynamic DNS service but I'd rather stick with using my domain name if I can.

thanks,

Joel
 
J

jmawhorter

New Member
I noticed a comment in another thread about dynamic TTLs having to be 600 or more. Perhaps that was part of my problem. I've changed that and I'll see. Is there any way to make that lower? 10 minutes is a long time for a host to be unreachable due to an IP change.
 
sandy

sandy

Administrator
Staff member
it needs to be no less then 600 seconds to avoid any TOO SOON errors given off by DDNS clients.. if updates come in in a very quick succession there is a chance that the new zone does not override the old.

sandy
 
sandy

sandy

Administrator
Staff member
looks to be set to off line dynamically.
can you please check your updater to make sure its not sending an off line IP and if you could send in the update logs that would be helpful as well

thanks
sandy
 
J

jmawhorter

New Member
To make this easier to debug I am going to use only command line arguments and use the parameters as specified on your website: https://cp.zoneedit.com/support/dynamic/clients/ez-ipupdate/

Here is exactly what I am running and the responses I'm getting:

admin@ip-172-31-16-214:~$ sudo ez-ipupdate -S easydns-partner -z zoneedit -s api.cp.zoneedit.com -g /dyn/ez-ipupdate.php -u jmawhorter:************* -h vpnserver.mawhorter.org -a 35.161.163.251
ez-ipupdate Version 3.0.11b8
Copyright (C) 1998-2001 Angus Mackay
connected to api.cp.zoneedit.com (64.68.198.48) on port 80
error recv()ing reply: Connection reset by peer
strange server response, are you connecting to the right server?

admin@ip-172-31-16-214:~$ sudo ez-ipupdate -S easydns-partner -z zoneedit -s api.cp.zoneedit.com -g /dyn/ez-ipupdate.php -u jmawhorter:************* -h vpnserver.mawhorter.org -a 35.161.163.251
ez-ipupdate Version 3.0.11b8
Copyright (C) 1998-2001 Angus Mackay
connected to api.cp.zoneedit.com (64.68.198.48) on port 80
error recv()ing reply: Connection reset by peer
strange server response, are you connecting to the right server?

admin@ip-172-31-16-214:~$ sudo ez-ipupdate -S easydns-partner -z zoneedit -s api.cp.zoneedit.com -g /dyn/ez-ipupdate.php -u jmawhorter:************* -h vpnserver.mawhorter.org -a 35.161.163.251
ez-ipupdate Version 3.0.11b8
Copyright (C) 1998-2001 Angus Mackay
connected to api.cp.zoneedit.com (64.68.198.48) on port 80
unknown return code: 500
server response: Internal Server Error

As before, I'm staring out the AUTH token but I've confirmed it is exactly what is in the control panel.

Here is a tcpdump of the last interaction:


admin@ip-172-31-16-214:~$ sudo tcpdump -vv host api.cp.zoneedit.com
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
20:23:56.699123 IP (tos 0x0, ttl 64, id 41832, offset 0, flags [DF], proto TCP (6), length 60)
ip-172-31-16-214.us-west-2.compute.internal.38446 > api.easyzone.ca.http: Flags , cksum 0xc398 (incorrect -> 0xfe6c), seq 751627950, win 26883, options [mss 8961,sackOK,TS val 1527238 ecr 0,nop,wscale 9], length 0
20:23:57.696564 IP (tos 0x0, ttl 64, id 41833, offset 0, flags [DF], proto TCP (6), length 60)
ip-172-31-16-214.us-west-2.compute.internal.38446 > api.easyzone.ca.http: Flags , cksum 0xc398 (incorrect -> 0xfd72), seq 751627950, win 26883, options [mss 8961,sackOK,TS val 1527488 ecr 0,nop,wscale 9], length 0
20:23:59.700548 IP (tos 0x0, ttl 64, id 41834, offset 0, flags [DF], proto TCP (6), length 60)
ip-172-31-16-214.us-west-2.compute.internal.38446 > api.easyzone.ca.http: Flags , cksum 0xc398 (incorrect -> 0xfb7d), seq 751627950, win 26883, options [mss 8961,sackOK,TS val 1527989 ecr 0,nop,wscale 9], length 0
20:23:59.765592 IP (tos 0x0, ttl 42, id 0, offset 0, flags [DF], proto TCP (6), length 60)
api.easyzone.ca.http > ip-172-31-16-214.us-west-2.compute.internal.38446: Flags [S.], cksum 0x3ba7 (correct), seq 4008540365, ack 751627951, win 14480, options [mss 1460,sackOK,TS val 1573210120 ecr 1527989,nop,wscale 6], length 0
20:23:59.765614 IP (tos 0x0, ttl 64, id 41835, offset 0, flags [DF], proto TCP (6), length 52)
ip-172-31-16-214.us-west-2.compute.internal.38446 > api.easyzone.ca.http: Flags [.], cksum 0xc390 (incorrect -> 0xa2bd), seq 1, ack 1, win 53, options [nop,nop,TS val 1528005 ecr 1573210120], length 0
20:23:59.765737 IP (tos 0x0, ttl 64, id 41836, offset 0, flags [DF], proto TCP (6), length 89)
ip-172-31-16-214.us-west-2.compute.internal.38446 > api.easyzone.ca.http: Flags [P.], cksum 0xc3b5 (incorrect -> 0xf6e1), seq 1:38, ack 1, win 53, options [nop,nop,TS val 1528005 ecr 1573210120], length 37
20:24:00.028524 IP (tos 0x0, ttl 64, id 41837, offset 0, flags [DF], proto TCP (6), length 306)
ip-172-31-16-214.us-west-2.compute.internal.38446 > api.easyzone.ca.http: Flags [P.], cksum 0xc48e (incorrect -> 0x2b82), seq 38:292, ack 1, win 53, options [nop,nop,TS val 1528071 ecr 1573210120], length 254
20:24:00.093611 IP (tos 0x0, ttl 42, id 12436, offset 0, flags [DF], proto TCP (6), length 64)
api.easyzone.ca.http > ip-172-31-16-214.us-west-2.compute.internal.38446: Flags [.], cksum 0x3366 (correct), seq 1, ack 1, win 227, options [nop,nop,TS val 1573210202 ecr 1528005,nop,nop,sack 1 {38:292}], length 0
20:24:00.112524 IP (tos 0x0, ttl 64, id 41838, offset 0, flags [DF], proto TCP (6), length 89)
ip-172-31-16-214.us-west-2.compute.internal.38446 > api.easyzone.ca.http: Flags [P.], cksum 0xc3b5 (incorrect -> 0xf638), seq 1:38, ack 1, win 53, options [nop,nop,TS val 1528092 ecr 1573210202], length 37
20:24:00.178009 IP (tos 0x0, ttl 42, id 12437, offset 0, flags [DF], proto TCP (6), length 52)
api.easyzone.ca.http > ip-172-31-16-214.us-west-2.compute.internal.38446: Flags [.], cksum 0xa02e (correct), seq 1, ack 292, win 227, options [nop,nop,TS val 1573210223 ecr 1528092], length 0
20:24:02.239239 IP (tos 0x0, ttl 42, id 12438, offset 0, flags [DF], proto TCP (6), length 558)
api.easyzone.ca.http > ip-172-31-16-214.us-west-2.compute.internal.38446: Flags [P.], cksum 0xa928 (correct), seq 1:507, ack 292, win 227, options [nop,nop,TS val 1573210738 ecr 1528092], length 506
20:24:02.239268 IP (tos 0x0, ttl 64, id 41839, offset 0, flags [DF], proto TCP (6), length 52)
ip-172-31-16-214.us-west-2.compute.internal.38446 > api.easyzone.ca.http: Flags [.], cksum 0xc390 (incorrect -> 0x9aca), seq 292, ack 507, win 55, options [nop,nop,TS val 1528623 ecr 1573210738], length 0
20:24:02.239709 IP (tos 0x0, ttl 42, id 12439, offset 0, flags [DF], proto TCP (6), length 52)
api.easyzone.ca.http > ip-172-31-16-214.us-west-2.compute.internal.38446: Flags [F.], cksum 0x9c30 (correct), seq 507, ack 292, win 227, options [nop,nop,TS val 1573210738 ecr 1528092], length 0
20:24:02.239735 IP (tos 0x0, ttl 64, id 41840, offset 0, flags [DF], proto TCP (6), length 52)
ip-172-31-16-214.us-west-2.compute.internal.38446 > api.easyzone.ca.http: Flags [F.], cksum 0xc390 (incorrect -> 0x9ac8), seq 292, ack 508, win 55, options [nop,nop,TS val 1528623 ecr 1573210738], length 0
20:24:02.304786 IP (tos 0x0, ttl 42, id 12440, offset 0, flags [DF], proto TCP (6), length 52)
api.easyzone.ca.http > ip-172-31-16-214.us-west-2.compute.internal.38446: Flags [.], cksum 0x9a0c (correct), seq 508, ack 293, win 227, options [nop,nop,TS val 1573210754 ecr 1528623], length 0
^C
15 packets captured
20 packets received by filter
0 packets dropped by kernel
 
J

jmawhorter

New Member
I switched to ddclient and that seems to work at the moment. Your dynamic DNS page for linux does not mention ddclient. I would suggest you add that there if you think it is the best client to use with your service.

Thanks for the help.
 
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