bind with qname min. fails to continue recursing on one specific query
jmurray at pdknox.org
jmurray at pdknox.org
Mon Mar 27 17:53:49 UTC 2023
Hi,
Recursive queries to a pair of matching bind 9.16 servers on openbsd 7.0 are timing out unexpectedly for only two names: "www.edison.tn.gov" and "www.tn.gov". Both bind instances are otherwise working fine, and have been for some time.
The query returns a CNAME, and there's a delegation to another set of nameservers on tn.gov, but as you can see below in the pcap and the named.run excerpt, bind never seems to follow up.
If I disable qname minimization this is no longer an issue, but I'd rather not, and I don't understand the behavior at all.
Queries for either tn.gov subdomain from other hosts on other networks to which I have access (all using Unbound for recursion unfortunately) are working as expected. And I'm seeing no other unexplained failures. I keep thinking I should be able to find some other domain which will trigger this behavior, but haven't yet.
According to users this has been going on since last Wednesday or late last Friday. The domains were resolving week before last based on my own experience, but I don't have logs from more than a few days ago, so I can't demonstrate that conclusively.
There's some relevant text from named.run below, also a bit of a packet capture, and I'm happy to supply whatever else may be helpful. Trimmed named.conf just a bit, marked where I've done so. All material is from before I thought to turn off qname minimisation.
I'm totally lost, any thoughts or suggestions are very very welcome.
Thanks,
Jason
### named.conf:
acl internals {
127.0.0.0/8;
10.0.0.0/8;
172.16.28.0/24;
128.25.10.0/24;
172.16.20.16/28;
};
acl nameservers {
172.16.20.23/32;
172.16.20.22/32;
172.16.20.30/32;
};
logging {
channel rpz.log {
file "/var/log/rpz.log" versions 3 size 5m;
severity info;
print-time yes;
print-severity yes;
print-category yes;
};
channel updates.log {
file "/var/log/ddns.log" versions 3 size 5m;
severity info;
print-time yes;
print-severity yes;
print-category yes;
};
channel query.log {
file "/var/log/query.log" versions 1 size 5m;
severity debug 3;
print-time yes;
print-severity yes;
print-category yes;
};
category queries { query.log; };
category update { updates.log; };
category rpz { rpz.log; };
category lame-servers { null; };
category edns-disabled { null; };
};
options {
directory "/tmp";
listen-on { 172.16.20.22; 172.16.20.30; };
check-names master warn ;
allow-transfer { nameservers; };
also-notify { 172.16.20.30; 172.16.20.23; };
allow-query { any; };
allow-recursion { internals; };
recursion 1;
dnssec-validation no;
#dnssec-validation auto;
#response-policy { zone rpz.local; };
#response-policy { zone rpz.local; } break-dnssec yes;
};
key "example.org" {
# trimmed
};
key "rndc-key" {
# trimmed
};
key "external" {
# trimmed
};
controls {
inet 127.0.0.1 port 953
allow { 127.0.0.1; } keys { "rndc-key"; };
};
view "internal" {
match-clients { !key external; internals; };
allow-recursion { internals; };
allow-query { any; };
recursion yes;
zone "." {
type hint;
file "/etc/named.ca";
};
#zone "rpz.local" {
# type master;
# file "/master/rpz.local.hosts";
# allow-query { localhost; };
# allow-transfer { nameservers; };
# notify yes;
#};
zone "example.org" {
type master;
file "/master/example.org.internal.hosts";
allow-update { key "example.org"; };
allow-transfer { nameservers; };
notify yes;
};
#trimmed spare zones
};
view "external" {
match-clients { key external; any; };
server 172.16.20.23 {
keys external;
provide-ixfr yes;
};
allow-transfer { nameservers; };
allow-query { any; };
allow-recursion { none; };
recursion no;
zone "." {
type hint;
file "/etc/named.ca";
};
zone "example.org" {
type master;
file "/master/example.org.external.hosts";
allow-transfer { nameservers; };
notify yes;
};
#trimmed spare zones
};
### trace:
; <<>> dig 9.10.8-P1 <<>> +trace www.tn.gov
;; global options: +cmd
. 518400 IN NS a.root-servers.net.
. 518400 IN NS b.root-servers.net.
. 518400 IN NS c.root-servers.net.
. 518400 IN NS d.root-servers.net.
. 518400 IN NS e.root-servers.net.
. 518400 IN NS f.root-servers.net.
. 518400 IN NS g.root-servers.net.
. 518400 IN NS h.root-servers.net.
. 518400 IN NS i.root-servers.net.
. 518400 IN NS j.root-servers.net.
. 518400 IN NS k.root-servers.net.
. 518400 IN NS l.root-servers.net.
. 518400 IN NS m.root-servers.net.
. 518400 IN RRSIG NS 8 0 518400 20230409050000 20230327040000 951 . t+KnpQ8krckGR1TKbbnXS0SpqIrkwc6BaloU5aYOAPTLKHIKUqIEF9Iy QmO6dRmqnc83gemskilawqXVZhVj7gxESBCUjagPGBiNIk4gviuUQRVN G+/RhghXu9hj/CXUNEBZOjPK4pqzSu6c16ke5Vqq08HNQ/BGLmKvqaeT Qbr4X90/Q4CUw96KsikR4CLnTE7cH4uVDMSiKCq0tffU0mpoNW9b7Tmu impzaelhnrQf8LFuoXjjZZYqh1wLvrA1idHIcNxGThlTjXEP0do//jx2 Lu+b6qg0DXhvKq9V13j/buoykYIUqQfwptaRE47A0tuYkxJ2vIdDcPBw WrwP7Q==
;; Received 1097 bytes from 198.41.0.4#53(198.41.0.4) in 31 ms
gov. 172800 IN NS a.gov-servers.net.
gov. 172800 IN NS b.gov-servers.net.
gov. 172800 IN NS c.gov-servers.net.
gov. 172800 IN NS d.gov-servers.net.
gov. 86400 IN DS 7698 8 2 6BC949E638442EAD0BDAF0935763C8D003760384FF15EBBD5CE86BB5 559561F0
gov. 86400 IN RRSIG DS 8 1 86400 20230409050000 20230327040000 951 . pG2IqTXzt6d59WSPYZhix1N+8+Ho1USjAkK0TLVNDxH/BWWm5KDO1gu+ Ncl2v4u3JAV/0rhzsHCuuEaNwE5yYpjQ4ZBwHAerM61RApO0M8Sll+yy s3Fv/5LtYq0Tga03CmcOYOhqq7XZY8hcsyZKzx9kBz71bWOspEQPhqBV 9KdqNBIhJUEB1+UvB3h+XMHHUNp+rXU9e2XoLdg+0XCWAeAuvSgF03X4 pLfW9n87u6rdVOPum3llk30OUcdmPksSejfNV6ql51Vb6+i5gzaiRfPo 8xmnnzCiznRRJinOIIRICWXPtVzzYzhHOMtyOfi7y5zFnEMrLgO4WvO4 n95HMw==
;; Received 632 bytes from 192.36.148.17#53(i.root-servers.net) in 51 ms
tn.gov. 86400 IN NS dns5.tn.gov.
tn.gov. 86400 IN NS dns4.tn.gov.
tn.gov. 3600 IN DS 57846 7 2 8090B0ABEFE816562BBEA62C42425B20508C9D686D9B61CE8A4A1D56 B29EC37C
tn.gov. 3600 IN DS 16161 7 2 688FB0A9319F5C0308CAA3F28DCC81C18B91B622626B7A626D5CCB5F 610B63F4
tn.gov. 3600 IN DS 16161 7 1 0C4B91101A1D20CE97068A63C7CD4E8864A4F2F1
tn.gov. 3600 IN DS 57846 7 1 85561664845E11764CC868182B2D683084E74365
tn.gov. 3600 IN RRSIG DS 8 2 3600 20230401044223 20230325044223 24250 gov. GkK/PcYR7uUkrai1Q3T4W9fulCEVDThEIzZsxrBzujmn0hcfKNB5LCTC SlbheJGtNxss7xGZ+cr44XWDXcL8URc2hc0pVz4zrCTsAgqpcqv0RNJC ZdNXFTKKtDacEnhi4l1JCOG6nWTUeofZFlD++W4TQibRLjTehnna31/V M0Ppx0w5z3BeICN4wnFPSng5hXce9aGSuzVnxBiw7l61IQ==
;; Received 472 bytes from 69.36.153.30#53(c.gov-servers.net) in 38 ms
www.tn.gov. 300 IN CNAME www.extglb.tn.gov.
www.tn.gov. 300 IN RRSIG CNAME 7 3 300 20230407012735 20230308002943 16643 tn.gov. DPr9spOSdQs/8zK2DlnGFFk0v8H+16o7g4l7yPcMns7U6txVpnclWrp8 UvLQiPCejVFhSZ0By7sM166vs8c0ar7VBfOzt84zW7cdtkGTZEvB2Nue KDw2gP00MRu7914b+4xawGyzhiuU0tcABn2nElhb2dIrwpF05InxUckq SL0=
extglb.tn.gov. 300 IN NS sdcgtm02.tn.gov.
extglb.tn.gov. 300 IN NS ndcgtm02.tn.gov.
extglb.tn.gov. 300 IN NS ndcgtm01.tn.gov.
extglb.tn.gov. 300 IN NS sdcgtm01.tn.gov.
7VIFF5QRM0PHTVOHKKJ31SMHH09RAE81.tn.gov. 600 IN NSEC3 1 0 100 D317AC7ABABEF654 7VP1VJA5RP6KBKTVVS2IP1FCA30S4GF4 NS
7VIFF5QRM0PHTVOHKKJ31SMHH09RAE81.tn.gov. 600 IN RRSIG NSEC3 7 3 600 20230416173711 20230317173148 16643 tn.gov. ZxWY7y+RLEifC89LyPAtq0TQIPFuH0mrSbSCb3K44IJfqIwM8z7BuKb/ aM7gtPmApI2zxw2XpKaN7AK+XtBXdHJ29IRJQgQTnatIc+v8rU/hws/g fW8C5uQkq0XOU/YAzUGjOmtNdnzSEQZVi9CCYSsw7AqhVlUYssvAMbXE M5I=
;; Received 576 bytes from 170.141.168.22#53(dns5.tn.gov) in 49 ms
### named.run:
27-Mar-2023 09:46:41.285 client @0x5c28fe12d0 10.0.2.3#26386: UDP request
27-Mar-2023 09:46:41.285 client @0x5c28fe12d0 10.0.2.3#26386: view internal: using view 'internal'
27-Mar-2023 09:46:41.285 client @0x5c28fe12d0 10.0.2.3#26386: view internal: request is not signed
27-Mar-2023 09:46:41.285 client @0x5c28fe12d0 10.0.2.3#26386: view internal: recursion available
27-Mar-2023 09:46:41.285 client @0x5c28fe12d0 10.0.2.3#26386 (www.tn.gov): view internal: query (cache) 'www.tn.gov/A/IN' approved
27-Mar-2023 09:46:41.285 client @0x5c28fe12d0 10.0.2.3#26386 (www.tn.gov): view internal: rrl=0x0, HAVECOOKIE=0, result=DNS_R_DELEGATION, fname=0x5c37daf000(1), is_zone=0, RECURSIONOK=1, query.rpz_st=0x0(0), RRL_CHECKED=0
27-Mar-2023 09:46:41.285 fctx 0x5cc34ea000(www.tn.gov/A): createfind for 10.0.2.3#26386/6215 - success
27-Mar-2023 09:46:41.285 fctx 0x5cc34ea000(www.tn.gov/A): createfind for 10.0.2.3#26386/6215 - success
27-Mar-2023 09:46:41.285 fctx 0x5cc34ea000(www.tn.gov/A): createfind for 10.0.2.3#26386/6215 - success
27-Mar-2023 09:46:41.285 fctx 0x5cc34ea000(www.tn.gov/A): createfind for 10.0.2.3#26386/6215 - success
27-Mar-2023 09:46:41.285 fctx 0x5cc34ea000(www.tn.gov/A): createfind for 10.0.2.3#26386/6215 - success
27-Mar-2023 09:46:41.285 fctx 0x5cc34ea000(www.tn.gov/A): createfind for 10.0.2.3#26386/6215 - success
27-Mar-2023 09:46:41.285 fctx 0x5cc34ea000(www.tn.gov/A): createfind for 10.0.2.3#26386/6215 - success
27-Mar-2023 09:46:41.285 fctx 0x5cc34ea000(www.tn.gov/A): createfind for 10.0.2.3#26386/6215 - success
27-Mar-2023 09:46:41.285 fctx 0x5cc34ea000(www.tn.gov/A): createfind for 10.0.2.3#26386/6215 - success
27-Mar-2023 09:46:41.285 fctx 0x5cc34ea000(www.tn.gov/A): createfind for 10.0.2.3#26386/6215 - success
27-Mar-2023 09:46:41.285 fctx 0x5cc34ea000(www.tn.gov/A): createfind for 10.0.2.3#26386/6215 - success
27-Mar-2023 09:46:41.285 fctx 0x5cc34ea000(www.tn.gov/A): createfind for 10.0.2.3#26386/6215 - success
27-Mar-2023 09:46:41.285 fctx 0x5cc34ea000(www.tn.gov/A): createfind for 10.0.2.3#26386/6215 - success
27-Mar-2023 09:46:41.349 fctx 0x5cc34ea000(www.tn.gov/A): createfind for 10.0.2.3#26386/6215 - success
27-Mar-2023 09:46:41.349 fctx 0x5cc34ea000(www.tn.gov/A): createfind for 10.0.2.3#26386/6215 - success
27-Mar-2023 09:46:41.488 client @0x5c28fe12d0 10.0.2.3#26386 (www.tn.gov): view internal: rrl=0x0, HAVECOOKIE=0, result=DNS_R_CNAME, fname=0x5c37daf000(1), is_zone=0, RECURSIONOK=1, query.rpz_st=0x0(0), RRL_CHECKED=0
27-Mar-2023 09:46:41.488 client @0x5c28fe12d0 10.0.2.3#26386 (www.tn.gov): view internal: rrl=0x0, HAVECOOKIE=0, result=DNS_R_DELEGATION, fname=0x5c37dae840(1), is_zone=0, RECURSIONOK=1, query.rpz_st=0x0(0), RRL_CHECKED=0
27-Mar-2023 09:46:41.488 fctx 0x5cc34cb800(www.extglb.tn.gov/A): createfind for 10.0.2.3#26386/6215 - success
27-Mar-2023 09:46:41.488 fctx 0x5cc34cb800(www.extglb.tn.gov/A): createfind for 10.0.2.3#26386/6215 - success
27-Mar-2023 09:46:46.295 client @0x5c14ce92d0 10.0.2.3#26386: UDP request
27-Mar-2023 09:46:46.295 client @0x5c14ce92d0 10.0.2.3#26386: view internal: using view 'internal'
27-Mar-2023 09:46:46.295 client @0x5c14ce92d0 10.0.2.3#26386: view internal: request is not signed
27-Mar-2023 09:46:46.295 client @0x5c14ce92d0 10.0.2.3#26386: view internal: recursion available
27-Mar-2023 09:46:46.295 client @0x5c14ce92d0 10.0.2.3#26386 (www.tn.gov): view internal: query (cache) 'www.tn.gov/A/IN' approved
27-Mar-2023 09:46:46.295 client @0x5c14ce92d0 10.0.2.3#26386 (www.tn.gov): view internal: rrl=0x0, HAVECOOKIE=0, result=DNS_R_CNAME, fname=0x5c81007840(1), is_zone=0, RECURSIONOK=1, query.rpz_st=0x0(0), RRL_CHECKED=0
27-Mar-2023 09:46:46.295 client @0x5c14ce92d0 10.0.2.3#26386 (www.tn.gov): view internal: rrl=0x0, HAVECOOKIE=0, result=DNS_R_DELEGATION, fname=0x5c81008000(1), is_zone=0, RECURSIONOK=1, query.rpz_st=0x0(0), RRL_CHECKED=0
27-Mar-2023 09:46:46.295 client @0x5c14ce92d0 10.0.2.3#26386 (www.tn.gov): view internal: request failed: duplicate query
27-Mar-2023 09:46:46.295 client @0x5c14ce92d0 10.0.2.3#26386 (www.tn.gov): view internal: reset client
27-Mar-2023 09:46:51.305 client @0x5c14cd92d0 10.0.2.3#26386: UDP request
27-Mar-2023 09:46:51.305 client @0x5c14cd92d0 10.0.2.3#26386: view internal: using view 'internal'
27-Mar-2023 09:46:51.305 client @0x5c14cd92d0 10.0.2.3#26386: view internal: request is not signed
27-Mar-2023 09:46:51.305 client @0x5c14cd92d0 10.0.2.3#26386: view internal: recursion available
27-Mar-2023 09:46:51.305 client @0x5c14cd92d0 10.0.2.3#26386 (www.tn.gov): view internal: query (cache) 'www.tn.gov/A/IN' approved
27-Mar-2023 09:46:51.305 client @0x5c14cd92d0 10.0.2.3#26386 (www.tn.gov): view internal: rrl=0x0, HAVECOOKIE=0, result=DNS_R_CNAME, fname=0x5c9a060c60(1), is_zone=0, RECURSIONOK=1, query.rpz_st=0x0(0), RRL_CHECKED=0
27-Mar-2023 09:46:51.305 client @0x5c14cd92d0 10.0.2.3#26386 (www.tn.gov): view internal: rrl=0x0, HAVECOOKIE=0, result=DNS_R_DELEGATION, fname=0x5c9a060840(1), is_zone=0, RECURSIONOK=1, query.rpz_st=0x0(0), RRL_CHECKED=0
27-Mar-2023 09:46:51.305 client @0x5c14cd92d0 10.0.2.3#26386 (www.tn.gov): view internal: request failed: duplicate query
27-Mar-2023 09:46:51.305 client @0x5c14cd92d0 10.0.2.3#26386 (www.tn.gov): view internal: reset client
27-Mar-2023 09:46:51.502 fctx 0x5cc34cb800(www.extglb.tn.gov/A): createfind for 10.0.2.3#26386/6215 - success
27-Mar-2023 09:46:51.502 fctx 0x5cc34cb800(www.extglb.tn.gov/A): createfind for 10.0.2.3#26386/6215 - success
27-Mar-2023 09:46:51.502 client @0x5c28fe12d0 10.0.2.3#26386 (www.tn.gov): view internal: rrl=0x0, HAVECOOKIE=0, result=ISC_R_TIMEDOUT, fname=0x5c37dae840(0), is_zone=0, RECURSIONOK=1, query.rpz_st=0x0(0), RRL_CHECKED=0
27-Mar-2023 09:46:51.502 client @0x5c28fe12d0 10.0.2.3#26386 (www.tn.gov): view internal: query failed (timed out) for www.tn.gov/IN/A at query.c:7365
27-Mar-2023 09:46:51.502 client @0x5c28fe12d0 10.0.2.3#26386 (www.tn.gov): view internal: reset client
### pcap from bind host:
10:01:29.932858 172.16.20.30.55396 > 170.141.167.222.53: [bad udp cksum e0f9! -> 1d95] 51443% [1au] A? _.extglb.tn.gov. ar: . OPT UDPsize=512 DO(56) (ttl 64, id 3035, len 84)
0000: 4500 0054 0bdb 0000 4011 752f 6005 471e E..T.... at .u/`.G.
0010: aa8d a7de d864 0035 0040 f9e0 c8f3 0010 .....d.5. at ......
0020: 0001 0000 0000 0001 015f 0665 7874 676c ........._.extgl
0030: 6202 746e 0367 6f76 0000 0100 0100 0029 b.tn.gov.......)
0040: 0200 0000 8000 000c 000a 0008 5971 94c0 ............Yq..
0050: 9932 9282 .2..
10:01:30.734907 172.16.20.30.54357 > 170.141.168.22.53: [bad udp cksum 28fa! -> 6fbf] 26020% [1au] A? _.extglb.tn.gov. ar: . OPT UDPsize=512 DO(72) (ttl 64, id 31451, len 100)
0000: 4500 0064 7adb 0000 4011 05e7 6005 471e E..dz... at ...`.G.
0010: aa8d a816 d455 0035 0050 fa28 65a4 0010 .....U.5.P.(e...
0020: 0001 0000 0000 0001 015f 0665 7874 676c ........._.extgl
0030: 6202 746e 0367 6f76 0000 0100 0100 0029 b.tn.gov.......)
0040: 0200 0000 8000 001c 000a 0018 9958 916a .............X.j
0050: a74b b667 0100 0000 6421 a18c e289 661d .K.g....d!....f.
0060: bcb1 c1fd ....
10:01:31.544914 172.16.20.30.54313 > 170.141.167.222.53: [bad udp cksum e0f9! -> a0ef] 29355% [1au] A? _.extglb.tn.gov. ar: . OPT UDPsize=512 DO(56) (ttl 64, id 50399, len 84)
0000: 4500 0054 c4df 0000 4011 bc2a 6005 471e E..T.... at ..*`.G.
0010: aa8d a7de d429 0035 0040 f9e0 72ab 0010 .....).5. at ..r...
0020: 0001 0000 0000 0001 015f 0665 7874 676c ........._.extgl
0030: 6202 746e 0367 6f76 0000 0100 0100 0029 b.tn.gov.......)
0040: 0200 0000 8000 000c 000a 0008 5971 94c0 ............Yq..
0050: 9932 9282 .2..
10:01:32.364921 172.16.20.30.53749 > 170.141.168.22.53: [bad udp cksum 28fa! -> 57a9] 32284% [1au] A? _.extglb.tn.gov. ar: . OPT UDPsize=512 DO(72) (ttl 64, id 11987, len 100)
0000: 4500 0064 2ed3 0000 4011 51ef 6005 471e E..d.... at .Q.`.G.
0010: aa8d a816 d1f5 0035 0050 fa28 7e1c 0010 .......5.P.(~...
0020: 0001 0000 0000 0001 015f 0665 7874 676c ........._.extgl
0030: 6202 746e 0367 6f76 0000 0100 0100 0029 b.tn.gov.......)
0040: 0200 0000 8000 001c 000a 0018 9958 916a .............X.j
0050: a74b b667 0100 0000 6421 a18c e289 661d .K.g....d!....f.
0060: bcb1 c1fd ....
10:01:33.184946 172.16.20.30.58249 > 170.141.167.222.53: [bad udp cksum e0f9! -> b0d8] 31291% [1au] A? _.extglb.tn.gov. ar: . OPT UDPsize=512 DO(56) (ttl 64, id 13338, len 84)
0000: 4500 0054 341a 0000 4011 4cf0 6005 471e E..T4... at .L.`.G.
0010: aa8d a7de e389 0035 0040 f9e0 7a3b 0010 .......5. at ..z;..
0020: 0001 0000 0000 0001 015f 0665 7874 676c ........._.extgl
0030: 6202 746e 0367 6f76 0000 0100 0100 0029 b.tn.gov.......)
0040: 0200 0000 8000 000c 000a 0008 5971 94c0 ............Yq..
0050: 9932 9282 .2..
10:01:33.994938 172.16.20.30.52629 > 170.141.168.22.53: [bad udp cksum 28fa! -> df64] 50932% [1au] A? _.extglb.tn.gov. ar: . OPT UDPsize=512 DO(72) (ttl 64, id 42050, len 100)
0000: 4500 0064 a442 0000 4011 dc7f 6005 471e E..d.B.. at ...`.G.
0010: aa8d a816 cd95 0035 0050 fa28 c6f4 0010 .......5.P.(....
0020: 0001 0000 0000 0001 015f 0665 7874 676c ........._.extgl
0030: 6202 746e 0367 6f76 0000 0100 0100 0029 b.tn.gov.......)
0040: 0200 0000 8000 001c 000a 0018 9958 916a .............X.j
0050: a74b b667 0100 0000 6421 a18c e289 661d .K.g....d!....f.
0060: bcb1 c1fd ....
10:01:34.804940 172.16.20.30.63268 > 170.141.167.222.53: [bad udp cksum e0f9! -> a7a3] 39849% [1au] A? _.extglb.tn.gov. ar: . OPT UDPsize=512 DO(56) (ttl 64, id 34673, len 84)
0000: 4500 0054 8771 0000 4011 f998 6005 471e E..T.q.. at ...`.G.
0010: aa8d a7de f724 0035 0040 f9e0 9ba9 0010 .....$.5. at ......
0020: 0001 0000 0000 0001 015f 0665 7874 676c ........._.extgl
0030: 6202 746e 0367 6f76 0000 0100 0100 0029 b.tn.gov.......)
0040: 0200 0000 8000 000c 000a 0008 5971 94c0 ............Yq..
0050: 9932 9282 .2..
10:01:36.424895 172.16.20.30.56217 > 170.141.168.22.53: [bad udp cksum 28fa! -> 8669] 46153% [1au] A? _.extglb.tn.gov. ar: . OPT UDPsize=512 DO(72) (ttl 64, id 945, len 100)
0000: 4500 0064 03b1 0000 4011 7d11 6005 471e E..d.... at .}.`.G.
0010: aa8d a816 db99 0035 0050 fa28 b449 0010 .......5.P.(.I..
0020: 0001 0000 0000 0001 015f 0665 7874 676c ........._.extgl
0030: 6202 746e 0367 6f76 0000 0100 0100 0029 b.tn.gov.......)
0040: 0200 0000 8000 001c 000a 0018 9958 916a .............X.j
0050: a74b b667 0100 0000 6421 a18c e289 661d .K.g....d!....f.
0060: bcb1 c1fd ....
10:01:38.035027 172.16.20.30.53192 > 170.141.167.222.53: [bad udp cksum e0f9! -> 0633] 13223% [1au] A? _.extglb.tn.gov. ar: . OPT UDPsize=512 DO(56) (ttl 64, id 33306, len 84)
0000: 4500 0054 821a 0000 4011 feef 6005 471e E..T.... at ...`.G.
0010: aa8d a7de cfc8 0035 0040 f9e0 33a7 0010 .......5. at ..3...
0020: 0001 0000 0000 0001 015f 0665 7874 676c ........._.extgl
0030: 6202 746e 0367 6f76 0000 0100 0100 0029 b.tn.gov.......)
0040: 0200 0000 8000 000c 000a 0008 5971 94c0 ............Yq..
0050: 9932 9282 .2..
10:01:39.945218 172.16.20.30.58268 > 170.141.167.222.53: [bad udp cksum e2f9! -> 7f9c] 15558% [1au] A? www.extglb.tn.gov. ar: . OPT UDPsize=512 DO(58) (ttl 64, id 46842, len 86)
0000: 4500 0056 b6fa 0000 4011 ca0d 6005 471e E..V.... at ...`.G.
0010: aa8d a7de e39c 0035 0042 f9e2 3cc6 0010 .......5.B..<...
0020: 0001 0000 0000 0001 0377 7777 0665 7874 .........www.ext
0030: 676c 6202 746e 0367 6f76 0000 0100 0100 glb.tn.gov......
0040: 0029 0200 0000 8000 000c 000a 0008 5971 .)............Yq
0050: 94c0 9932 9282 ...2..
10:01:39.992119 170.141.167.222.53 > 172.16.20.30.58268: 15558- q: A? www.extglb.tn.gov. 0/6/1 ns: extglb.tn.gov. [5m] NS ndcgtm01.tn.gov., extglb.tn.gov.[|domain] (DF) (ttl 43, id 35970, len 448)
0000: 4500 01c0 8c82 4000 2b11 c81b aa8d a7de E..... at .+.......
0010: 6005 471e 0035 e39c 01ac aa2f 3cc6 8010 `.G..5...../<...
0020: 0001 0000 0006 0001 0377 7777 0665 7874 .........www.ext
0030: 676c 6202 746e 0367 6f76 0000 0100 01c0 glb.tn.gov......
0040: 1000 0200 0100 0001 2c00 1108 6e64 6367 ........,...ndcg
0050: 746d 3031 0274 6e03 676f 7600 c010 0002 tm01.tn.gov.....
0060: 0001 0000 012c .....,
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