[SOLVED] DNS error on Alpine Linux

elgrandeperro · 10-07-2022, 11:55 AM

The timeout and #tries can be increase in /etc/resolv.conf with the options statement for testing.

I think it is like:

options timeout:5 attempts:6
would be 6 tries with timeout of 5 for each, so about 30 seconds. I think the default might be 5 timeout 3 tries.

black-clover · 10-08-2022, 11:37 AM

On Devuan lists.alpine.org shows no output on the terminal (but works on browser). If I try other websites then it shows the following:
DEVUAN

Code:

$ tcpdump -i wlan0 port 53
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
listening on wlan0, link-type EN10MB (Ethernet), snapshot length 262144 bytes
09:29:22.684785 IP mac.domain.name.33142 > RTK_GW.domain.name.domain: 25453+ A? ac.duckduckgo.com. (35)
09:29:22.684834 IP mac.domain.name.33142 > RTK_GW.domain.name.domain: 43797+ AAAA? ac.duckduckgo.com. (35)
09:29:22.693358 IP RTK_GW.domain.name.domain > mac.domain.name.33142: 25453 2/0/0 CNAME duckduckgo.com., A 52.250.42.157 (65)
09:29:22.693433 IP RTK_GW.domain.name.domain > mac.domain.name.33142: 43797 1/1/0 CNAME duckduckgo.com. (114)
09:29:22.718703 IP mac.domain.name.49769 > RTK_GW.domain.name.domain: 41939+ PTR? 254.1.168.192.in-addr.arpa. (44)
09:29:22.723344 IP RTK_GW.domain.name.domain > mac.domain.name.49769: 41939* 1/0/0 PTR RTK_GW.domain.name. (76)
09:29:22.723698 IP mac.domain.name.45820 > RTK_GW.domain.name.domain: 11947+ PTR? 69.1.168.192.in-addr.arpa. (43)
09:29:22.727162 IP RTK_GW.domain.name.domain > mac.domain.name.45820: 11947* 1/0/0 PTR mac.domain.name. (72)
09:29:25.770827 IP mac.domain.name.36279 > RTK_GW.domain.name.domain: 1166+ A? rum-http-intake.logs.datadoghq.com. (52)
09:29:25.779089 IP RTK_GW.domain.name.domain > mac.domain.name.36279: 1166 9/0/0 CNAME alb-logs-http-rum-pub-s0-1171131448.us-east-1.elb.amazonaws.com., A 3.233.153.12, A 3.233.153.127, A 3.233.153.120, A 3.233.149.198, A 3.233.149.196, A 3.233.153.125, A 3.233.153.129, A 3.233.153.121 (254)
09:29:25.779409 IP mac.domain.name.44449 > RTK_GW.domain.name.domain: 13442+ AAAA? rum-http-intake.logs.datadoghq.com. (52)
09:29:25.787243 IP RTK_GW.domain.name.domain > mac.domain.name.44449: 13442 9/0/0 CNAME alb-logs-http-rum-pub-s0-1171131448.us-east-1.elb.amazonaws.com., AAAA 2600:1f18:24e6:b902:d231:a282:cf08:a33, AAAA 2600:1f18:24e6:b902:7b73:bfbb:1bbb:4c12, AAAA 2600:1f18:24e6:b901:82bf:7748:2922:b37f, AAAA 2600:1f18:24e6:b900:765b:874d:29f3:841e, AAAA 2600:1f18:24e6:b900:6fe3:30:3061:2ca6, AAAA 2600:1f18:24e6:b900:c17a:225d:3c44:ae3e, AAAA 2600:1f18:24e6:b901:7782:c345:93e8:8e1f, AAAA 2600:1f18:24e6:b901:cd25:b11:b497:bb3d (350)
09:29:28.575935 IP mac.domain.name.51935 > RTK_GW.domain.name.domain: 43145+ A? alpinelinux.org. (33)
09:29:28.575980 IP mac.domain.name.51935 > RTK_GW.domain.name.domain: 3504+ AAAA? alpinelinux.org. (33)
09:29:28.584596 IP RTK_GW.domain.name.domain > mac.domain.name.51935: 43145 1/0/0 A 147.75.101.119 (49)
09:29:28.584671 IP RTK_GW.domain.name.domain > mac.domain.name.51935: 3504 1/0/0 AAAA 2604:1380:2002:4001::4 (61)

elgrandeperro · 10-08-2022, 01:45 PM

Don't think it is timeout, you can see the return time is pretty short.

One thing you can try, when accessing lists.alpinelinux.org, tcpdump it since we know the ip:

tcpdump -i interface host 147.75.101.119

and see if the browser actually sends a packet.

The other thing you can try, is to put the entry:

147.75.101.119 lists.alpinelinux.org

into /etc/hosts. This should be used instead of the dns resolver, if the problems is in the return of the dns resolver library.

You can verify this because if you tcpump port 53, you should NOT see the A request for lists.alpinelinux.org since it is getting it from a file.

I think you need to run debug/logging for a browser that is failing if these do not provide much help.

Do you build your browsers?

black-clover · 10-08-2022, 11:52 PM

Okay, here is how I solved it:

Enable Google's DNS servers by running for the last time.

Code:

sudo su "echo 'nameserver 8.8.8.8' > /etc/resolv.conf"

Get the fresh packages and install dhclient.

Code:

sudo apk update && sudo apk upgrade && sudo apk add dhclient

Create /etc/dhcp/dhclient.conf and put in the following:

Code:

option rfc3442-classless-static-routes code 121 = array of unsigned integer 8;

send host-name = gethostname();
request subnet-mask, broadcast-address, time-offset, routers,
        domain-name, domain-name-servers, domain-search, host-name,
        dhcp6.name-servers, dhcp6.domain-search, dhcp6.fqdn, dhcp6.sntp-servers,
        netbios-name-servers, netbios-scope, interface-mtu,
        rfc3442-classless-static-routes, ntp-servers;

prepend domain-name-servers 8.8.8.8, 8.8.4.4;

Then restarted networking

Code:

sudo rc-service networking restart

Now list.alpinelinux.org and all the other pages work.