Mostly, it works as expected, but I have weird DNS issues, where host, dig and nslookup find what I want, but applications for some DNS names report "Name or service not known" (ping), "(6) Could not resolve host" (curl) or "Hmm. We’re having trouble finding that site" (firefox).
Nslookup and dig have no problems finding the names, nor do apps on the host system.
The addresses causing issues are releases.jfrog.io and yum.puppet.com which I want yum to use as repos. Other names like www.centos.org and serverfault.com work perfectly.
Note the errors from ping below:
Code: Select all
[user@server ~]$ for i in serverfault.com releases.jfrog.io yum.puppet.com www.centos.org ; do echo " "; echo "Testing" $i; host $i; ping -c 2 $i; done Testing serverfault.com serverfault.com has address 22.214.171.124 serverfault.com has address 126.96.36.199 serverfault.com has address 188.8.131.52 serverfault.com has address 184.108.40.206 PING serverfault.com (220.127.116.11) 56(84) bytes of data. 64 bytes from 18.104.22.168 (22.214.171.124): icmp_seq=1 ttl=128 time=31.1 ms 64 bytes from 126.96.36.199 (188.8.131.52): icmp_seq=2 ttl=128 time=38.1 ms --- serverfault.com ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1001ms rtt min/avg/max/mdev = 31.075/34.611/38.147/3.536 ms Testing releases.jfrog.io releases.jfrog.io is an alias for endpointdns-prod-use1-lb.jfrog.io. endpointdns-prod-use1-lb.jfrog.io is an alias for a239bd5ffc31c4061881e7379b84e385-1677123289.us-east-1.elb.amazonaws.com. a239bd5ffc31c4061881e7379b84e385-1677123289.us-east-1.elb.amazonaws.com has address 184.108.40.206 a239bd5ffc31c4061881e7379b84e385-1677123289.us-east-1.elb.amazonaws.com has address 220.127.116.11 a239bd5ffc31c4061881e7379b84e385-1677123289.us-east-1.elb.amazonaws.com has address 18.104.22.168 a239bd5ffc31c4061881e7379b84e385-1677123289.us-east-1.elb.amazonaws.com has address 22.214.171.124 a239bd5ffc31c4061881e7379b84e385-1677123289.us-east-1.elb.amazonaws.com has address 126.96.36.199 a239bd5ffc31c4061881e7379b84e385-1677123289.us-east-1.elb.amazonaws.com has address 188.8.131.52 ping: releases.jfrog.io: Name or service not known Testing yum.puppet.com yum.puppet.com is an alias for d1ge15oq8tiwk1.cloudfront.net. d1ge15oq8tiwk1.cloudfront.net has address 184.108.40.206 d1ge15oq8tiwk1.cloudfront.net has address 220.127.116.11 d1ge15oq8tiwk1.cloudfront.net has address 18.104.22.168 d1ge15oq8tiwk1.cloudfront.net has address 22.214.171.124 d1ge15oq8tiwk1.cloudfront.net has IPv6 address 2600:9000:20ec:9200:3:d41c:9440:93a1 d1ge15oq8tiwk1.cloudfront.net has IPv6 address 2600:9000:20ec:bc00:3:d41c:9440:93a1 d1ge15oq8tiwk1.cloudfront.net has IPv6 address 2600:9000:20ec:f800:3:d41c:9440:93a1 d1ge15oq8tiwk1.cloudfront.net has IPv6 address 2600:9000:20ec:0:3:d41c:9440:93a1 d1ge15oq8tiwk1.cloudfront.net has IPv6 address 2600:9000:20ec:1a00:3:d41c:9440:93a1 d1ge15oq8tiwk1.cloudfront.net has IPv6 address 2600:9000:20ec:4000:3:d41c:9440:93a1 d1ge15oq8tiwk1.cloudfront.net has IPv6 address 2600:9000:20ec:6c00:3:d41c:9440:93a1 d1ge15oq8tiwk1.cloudfront.net has IPv6 address 2600:9000:20ec:6e00:3:d41c:9440:93a1 ping: yum.puppet.com: Name or service not known Testing www.centos.org www.centos.org has address 126.96.36.199 www.centos.org has address 188.8.131.52 www.centos.org has address 184.108.40.206 www.centos.org has IPv6 address 2001:4de0:aaae::201 www.centos.org has IPv6 address 2001:4de0:aaae::202 www.centos.org has IPv6 address 2a05:d01c:c6a:cc02:e4d3:88b0:60da:6fb4 PING www.centos.org (220.127.116.11) 56(84) bytes of data. 64 bytes from ip-18.104.22.168.centos.org (22.214.171.124): icmp_seq=1 ttl=128 time=373 ms 64 bytes from ip-126.96.36.199.centos.org (188.8.131.52): icmp_seq=2 ttl=128 time=335 ms --- www.centos.org ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1002ms rtt min/avg/max/mdev = 334.686/353.943/373.200/19.257 ms
What am I missing? What should I look at?