UDP Client: doesn't resolve inside VirtualBox

[eviltik]

Hi again,

I'm running dns2 inside a Debian VM - VirtualBox.

When i force dns2 to use the same IP addr resolver that nslookup use, dns2 return an empty result. tcpdump show an access denied.

NSLOOKUP:

root@debian:/home/franck# /usr/sbin/tcpdump -Ax -n udp port 53
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on enp0s3, link-type EN10MB (Ethernet), capture size 262144 bytes
14:05:31.332388 IP 10.0.2.15.47214 > 192.168.1.254.53: 18577+ A? google.com. (28)
        0x0000:  4500 0038 95a1 0000 4011 165f 0a00 020f
        0x0010:  c0a8 01fe b86e 0035 0024 ceea 4891 0100
        0x0020:  0001 0000 0000 0000 0667 6f6f 676c 6503
        0x0030:  636f 6d00 0001 0001
14:05:31.337546 IP 192.168.1.254.53 > 10.0.2.15.47214: 18577 1/0/0 A 142.250.179.78 (44)
        0x0000:  4500 0048 c8d6 0000 4011 e319 c0a8 01fe
        0x0010:  0a00 020f 0035 b86e 0034 983e 4891 8180
        0x0020:  0001 0001 0000 0000 0667 6f6f 676c 6503
        0x0030:  636f 6d00 0001 0001 c00c 0001 0001 0000
        0x0040:  00c7 0004 8efa b34e
14:05:31.338036 IP 10.0.2.15.50613 > 192.168.1.254.53: 49218+ AAAA? google.com. (28)
        0x0000:  4500 0038 95a2 0000 4011 165e 0a00 020f
        0x0010:  c0a8 01fe c5b5 0035 0024 ceea c042 0100
        0x0020:  0001 0000 0000 0000 0667 6f6f 676c 6503
        0x0030:  636f 6d00 001c 0001
14:05:31.340476 IP 192.168.1.254.53 > 10.0.2.15.50613: 49218 1/0/0 AAAA 2a00:1450:4007:80a::200e (56)
        0x0000:  4500 0054 c8d7 0000 4011 e30c c0a8 01fe
        0x0010:  0a00 020f 0035 c5b5 0040 aeb8 c042 8180
        0x0020:  0001 0001 0000 0000 0667 6f6f 676c 6503
        0x0030:  636f 6d00 001c 0001 c00c 001c 0001 0000
        0x0040:  00d4 0010 2a00 1450 4007 080a 0000 0000
        0x0050:  0000 200e

DNS2

14:05:43.510957 IP 10.0.2.15.60211 > 192.168.1.254.53: 183 A? google.com. (28)
        0x0000:  4500 0038 97be 4000 4011 d441 0a00 020f
        0x0010:  c0a8 01fe eb33 0035 0024 ceea 00b7 0000
        0x0020:  0001 0000 0000 0000 0667 6f6f 676c 6503
        0x0030:  636f 6d00 0001 0001
14:05:43.518647 IP 192.168.1.254.53 > 10.0.2.15.60211: 183 Refused 0/0/0 (28)
        0x0000:  4500 0038 c8d8 0000 4011 e327 c0a8 01fe
        0x0010:  0a00 020f 0035 eb33 0024 b192 00b7 8085
        0x0020:  0001 0000 0000 0000 0667 6f6f 676c 6503
        0x0030:  636f 6d00 0001 0001

Any idea ?

You will find in attachement pcap files with both traces.

virtualbox_nslookup_ok_dns2_ko.zip

[eviltik]

Solved by #29