Python 为什么DNS响应不同?
我有python代码Python 为什么DNS响应不同?,python,dns,dig,Python,Dns,Dig,我有python代码 from dns import message, query, flags, rdatatype q = message.make_query("bancontact.node1.web1.prod.kunstmaan.com", rdatatype.NS, want_dnssec=True) q.flags |= flags.AD res = query.udp(q, "170.252.72.92") 和digquery dig bancontact.node1.we
from dns import message, query, flags, rdatatype
q = message.make_query("bancontact.node1.web1.prod.kunstmaan.com", rdatatype.NS, want_dnssec=True)
q.flags |= flags.AD
res = query.udp(q, "170.252.72.92")
和dig
query
dig bancontact.node1.web1.prod.kunstmaan.com ns @170.252.72.92
我向Wireshark检查查询是否相等:
此查询来自python
:
0000 4c 17 eb fe 74 00 f0 18 98 74 f9 be 08 00 45 00 L...t....t....E.
0010 00 61 2b 0d 00 00 40 11 9a 71 c0 a8 01 0d aa fc .a+...@..q......
0020 48 5c d0 42 00 35 00 4d 18 59 7d 2a 01 20 00 01 H\.B.5.M.Y}*. ..
0030 00 00 00 00 00 01 0a 62 61 6e 63 6f 6e 74 61 63 .......bancontac
0040 74 05 6e 6f 64 65 31 04 77 65 62 31 04 70 72 6f t.node1.web1.pro
0050 64 09 6b 75 6e 73 74 6d 61 61 6e 03 63 6f 6d 00 d.kunstmaan.com.
0060 00 02 00 01 00 00 29 05 00 00 00 80 00 00 00 ......)........
这来自dig
0000 4c 17 eb fe 74 00 f0 18 98 74 f9 be 08 00 45 00 L...t....t....E.
0010 00 61 c8 9b 00 00 40 11 fc e2 c0 a8 01 0d aa fc .a....@.........
0020 48 5c d4 49 00 35 00 4d 45 f3 4b fe 01 20 00 01 H\.I.5.ME.K.. ..
0030 00 00 00 00 00 01 0a 62 61 6e 63 6f 6e 74 61 63 .......bancontac
0040 74 05 6e 6f 64 65 31 04 77 65 62 31 04 70 72 6f t.node1.web1.pro
0050 64 09 6b 75 6e 73 74 6d 61 61 6e 03 63 6f 6d 00 d.kunstmaan.com.
0060 00 02 00 01 00 00 29 10 00 00 00 00 00 00 00 ......)........
区别仅在于标识:2b 0d
vsc8 9b
,标头校验和:9a 71
vsfc e2
,源端口:d0 42
vsd4 49
和事务ID:18 59 7d 2a
vs45 f3 4b fe
Query equals,所有标志都等于,但对python代码中的查询的响应:
DNS 119 Standard query response 0x7d2a NS bancontact.node1.web1.prod.kunstmaan.com OPT
与dig对查询的响应不同
DNS 205 Standard query response 0x4bfe NS bancontact.node1.web1.prod.kunstmaan.com CNAME public.node1.web1.prod.kunstmaan.com SOA amrns1501.accenture.com OPT
有人能解释为什么会这样吗
谢谢。您的查询还有两个不同之处:
0500
,从dig中可以看到100000
as“”80 00
),从dig中不设置(00
)dig bancontact.node1.web1.prod.kunstmaan.com ns @170.252.72.92 +bufsize=1280 +dnssec +ignore +nocookie