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| Title: | DEC TCP/IP Services for OpenVMS |
| Notice: | Note 2-SSB Kits, 3-FT Kits, 4-Patch Info, 7-QAR System |
| Moderator: | ucxaxp.ucx.lkg.dec.com::TIBBERT |
|
| Created: | Thu Nov 17 1994 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 5568 |
| Total number of notes: | 21492 |
5534.0. "Inverse query for zone transfer" by EWBV06::KASAHARA () Tue May 27 1997 08:38
When I issue "ucx show host/nolocal" on ucx host configured with
bind resolver, ucx always send the inverse query packet first to
DNS server.
If the DNS server returns a error status to ucx, ucx never attempt
to transfer any zone information.(it does not initiate TCP connection.)
Question:
Why does ucx send the inverse query to DNS server?
Do you have any idea to avoid this problem?
Is this behavior modified by ucx V4.2?
Could you please let me know about this ucx implementation?
Best regards,
Yoshi.
I put trace data receiving refused error from DNS server.
UCX INTERnet trace XMT packet seq # = 342 at 6-SEP-1996 10:31:08.81
IP Version = 4, IHL = 5, TOS = 00, Total Length = 55 = ^x0037
IP Identifier = ^xB3EB, Flags (0=0,DF=0,MF=0),
Fragment Offset = 0 = ^x0000, Calculated Offset = 0 = ^x0000
IP TTL = 128 = ^x80, Protocol = 17 = ^x11, Header Checksum = ^xB83A
IP Source Address = 134.160.3.5
IP Destination Address = 134.160.4.5
UDP Source Port = 3540, UDP Destination Port = 53
UDP Header and Datagram Length = 35 = ^x0023, Checksum = ^xC828
0503A086 B83A1180 0000B3EB 37000045 0000 E..7......:.....
00090100 | C8282300 3500D40D | 0504A086 0010 .......5.#(.....
00000001 00010000 00000000 01000000 0020 ................
0504A0 86040000 0030 .......
[Here is my decode:]
Id = 0001 Frag = 0900 '0 0001 0 0 1 0 000 0000' QR=0,IQUERY,RD
Question= 0, Answer= 1, Autho=0, Addi=0
Name= 00 , Type= 0001: A, Class= 0001: Internet , TTL= 0000 0000
Resource= 0004 byte : 134.160.4.5
-----------------------------------------------------------------------
UCX INTERnet trace RCV packet seq # = 343 at 6-SEP-1996 10:31:08.81
IP Version = 4, IHL = 5, TOS = 00, Total Length = 55 = ^x0037
IP Identifier = ^xC63C, Flags (0=0,DF=0,MF=0),
Fragment Offset = 0 = ^x0000, Calculated Offset = 0 = ^x0000
IP TTL = 59 = ^x3B, Protocol = 17 = ^x11, Header Checksum = ^xA62E
IP Source Address = 134.160.4.5
IP Destination Address = 134.160.3.5
UDP Source Port = 53, UDP Destination Port = 3540
UDP Header and Datagram Length = 35 = ^x0023, Checksum = ^x0000
0504A086 A62E113B 0000C63C 37000045 0000 E..7<...;.......
85890100 | 00002300 D40D3500 | 0503A086 0010 .....5...#......
00000001 00010000 00000000 01000000 0020 ................
0504A0 86040000 0030 .......
Id = 0001 Frag = 8985 '1 0001 0 0 1 1 000 0101' QR=1,IQUERY,RD,RA
Reason= 101 : Refused
Question= 0, Answer= 1, Autho=0, Addi=0
Name= 00 , Type= 0001: A, Class= 0001: Internet , TTL= 0000 0000
Resource= 0004byte : 134.160.4.5
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