Hi,
So I set up a local caching server with bind. It seems to work, kind of, the
problem is that cached results do not stay in cache for long, if they placed in
cache at all. For example, in the example below bind caches the result for
"old.reddit.com" but 8 minutes later tries to look up "old.reddit.com" again
when it's supposed to have the result in cache.
Any ideas? Thanks
# aptitude show bind9
Package: bind9
...
Version: 1:9.8.4.dfsg.P1-6+nmu2+deb7u20
# cat lless named.conf.options
...
options {
directory "/var/cache/bind";
listen-on port 53 { our-nets; };
allow-query { our-nets; };
allow-query-cache { our-nets; };
recursion yes;
allow-recursion { our-nets; };
auth-nxdomain no; # conform to RFC1035
blackhole { bogusnets; };
};
# rndc dumpdb --cache
# cat /var/cache/bind/named_dump.db
; Dump complete
# cat db.127
;
; BIND reverse data file for local loopback interface
;
$TTL 604800
@ IN SOA localhost. root.localhost. (
2018091900 ; Serial
28800 ; Refresh
7200 ; Retry
604800 ; Expire
86400 ; Negative Cache TTL
);
@ IN NS localhost.
1.0.0 IN PTR localhost.
# dig old.reddit.com
; <<>> DiG 9.8.4-rpz2+rl005.12-P1 <<>> old.reddit.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 45712
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 4, ADDITIONAL: 4
;; QUESTION SECTION:
;old.reddit.com. IN A
;; ANSWER SECTION:
old.reddit.com. 241 IN CNAME reddit.map.fastly.net.
reddit.map.fastly.net. 8 IN A 151.101.21.140
;; AUTHORITY SECTION:
fastly.net. 862 IN NS ns4.fastly.net.
fastly.net. 862 IN NS ns1.fastly.net.
fastly.net. 862 IN NS ns2.fastly.net.
fastly.net. 862 IN NS ns3.fastly.net.
;; ADDITIONAL SECTION:
ns1.fastly.net. 83935 IN A 23.235.32.32
ns2.fastly.net. 83935 IN A 104.156.80.32
ns3.fastly.net. 83935 IN A 23.235.36.32
ns4.fastly.net. 83935 IN A 104.156.84.32
;; Query time: 3 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Sun Sep 16 17:41:59 2018
;; MSG SIZE rcvd: 219
# dig old.reddit.com
; <<>> DiG 9.8.4-rpz2+rl005.12-P1 <<>> old.reddit.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 28790
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 4, ADDITIONAL: 4
;; QUESTION SECTION:
;old.reddit.com. IN A
;; ANSWER SECTION:
old.reddit.com. 234 IN CNAME reddit.map.fastly.net.
reddit.map.fastly.net. 1 IN A 151.101.21.140
;; AUTHORITY SECTION:
fastly.net. 855 IN NS ns4.fastly.net.
fastly.net. 855 IN NS ns3.fastly.net.
fastly.net. 855 IN NS ns1.fastly.net.
fastly.net. 855 IN NS ns2.fastly.net.
;; ADDITIONAL SECTION:
ns1.fastly.net. 83928 IN A 23.235.32.32
ns2.fastly.net. 83928 IN A 104.156.80.32
ns3.fastly.net. 83928 IN A 23.235.36.32
ns4.fastly.net. 83928 IN A 104.156.84.32
;; Query time: 0 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Sun Sep 16 17:42:06 2018
;; MSG SIZE rcvd: 219
# dig old.reddit.com
; <<>> DiG 9.8.4-rpz2+rl005.12-P1 <<>> old.reddit.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 5572
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;old.reddit.com. IN A
;; Query time: 2537 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Sun Sep 16 17:50:08 2018
;; MSG SIZE rcvd: 32
