Attachment (hopefully)
----- Original Message -----
From: "Al Stu" <al_...@verizon.net>
To: <bind-users@lists.isc.org>
Sent: Sunday, January 25, 2009 10:15 AM
Subject: Re: BIND 9.6 Flaw - CNAME vs. A Record in MX Records are NOT
"Illegal"
Yes, blah was supposed to be srv1.
I do receive both the CNAME and A records for the A mx.xyz.com query. See
attached capture file.
In the capture file three global search and replacements were performed to
match the previous example.
1) domain name was replaced with xyz
2) server name was replaced with srv1
3) server ip address was replaced with 1.2.3.4
Requirements are met.
----- Original Message -----
From: "Matthew Pounsett" <m...@conundrum.com>
To: "Al Stu" <al_...@verizon.net>
Cc: <bind-users@lists.isc.org>
Sent: Sunday, January 25, 2009 9:49 AM
Subject: Re: BIND 9.6 Flaw - CNAME vs. A Record in MX Records are NOT
"Illegal"
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bind-users@lists.isc.org
https://lists.isc.org/mailman/listinfo/bind-users
No. Time Source Destination Protocol Info
1 0.000000 192.168.1.16 192.168.1.1 DNS
Standard query MX xyz.com
Frame 1 (74 bytes on wire, 74 bytes captured)
Ethernet II, Src: Usi_de:94:de (00:10:c6:de:94:de), Dst: Actionte_51:fa:72
(00:18:01:51:fa:72)
Internet Protocol, Src: 192.168.1.16 (192.168.1.16), Dst: 192.168.1.1
(192.168.1.1)
User Datagram Protocol, Src Port: 4482 (4482), Dst Port: domain (53)
Domain Name System (query)
[Response In: 2]
Transaction ID: 0x0002
Flags: 0x0100 (Standard query)
Questions: 1
Answer RRs: 0
Authority RRs: 0
Additional RRs: 0
Queries
No. Time Source Destination Protocol Info
2 0.063279 192.168.1.1 192.168.1.16 DNS
Standard query response MX 1 MX2.xyz.com MX 1 MX1.xyz.com
Frame 2 (114 bytes on wire, 114 bytes captured)
Ethernet II, Src: Actionte_51:fa:72 (00:18:01:51:fa:72), Dst: Usi_de:94:de
(00:10:c6:de:94:de)
Internet Protocol, Src: 192.168.1.1 (192.168.1.1), Dst: 192.168.1.16
(192.168.1.16)
User Datagram Protocol, Src Port: domain (53), Dst Port: 4482 (4482)
Domain Name System (response)
[Request In: 1]
[Time: 0.063279000 seconds]
Transaction ID: 0x0002
Flags: 0x8180 (Standard query response, No error)
Questions: 1
Answer RRs: 2
Authority RRs: 0
Additional RRs: 0
Queries
Answers
xyz.com: type MX, class IN, preference 1, mx MX2.xyz.com
Name: xyz.com
Type: MX (Mail exchange)
Class: IN (0x0001)
Time to live: 30 minutes
Data length: 8
Preference: 1
Mail exchange: MX2.xyz.com
xyz.com: type MX, class IN, preference 1, mx MX1.xyz.com
Name: xyz.com
Type: MX (Mail exchange)
Class: IN (0x0001)
Time to live: 30 minutes
Data length: 8
Preference: 1
Mail exchange: MX1.xyz.com
No. Time Source Destination Protocol Info
3 15.625151 192.168.1.16 192.168.1.1 DNS
Standard query A mx1.xyz.com
Frame 3 (78 bytes on wire, 78 bytes captured)
Ethernet II, Src: Usi_de:94:de (00:10:c6:de:94:de), Dst: Actionte_51:fa:72
(00:18:01:51:fa:72)
Internet Protocol, Src: 192.168.1.16 (192.168.1.16), Dst: 192.168.1.1
(192.168.1.1)
User Datagram Protocol, Src Port: 4483 (4483), Dst Port: domain (53)
Domain Name System (query)
[Response In: 4]
Transaction ID: 0x0003
Flags: 0x0100 (Standard query)
Questions: 1
Answer RRs: 0
Authority RRs: 0
Additional RRs: 0
Queries
No. Time Source Destination Protocol Info
4 15.718055 192.168.1.1 192.168.1.16 DNS
Standard query response CNAME srv1.xyz.com A 1.2.3.4
Frame 4 (120 bytes on wire, 120 bytes captured)
Ethernet II, Src: Actionte_51:fa:72 (00:18:01:51:fa:72), Dst: Usi_de:94:de
(00:10:c6:de:94:de)
Internet Protocol, Src: 192.168.1.1 (192.168.1.1), Dst: 192.168.1.16
(192.168.1.16)
User Datagram Protocol, Src Port: domain (53), Dst Port: 4483 (4483)
Domain Name System (response)
[Request In: 3]
[Time: 0.092904000 seconds]
Transaction ID: 0x0003
Flags: 0x8180 (Standard query response, No error)
Questions: 1
Answer RRs: 2
Authority RRs: 0
Additional RRs: 0
Queries
Answers
mx1.xyz.com: type CNAME, class IN, cname srv1.xyz.com
Name: mx1.xyz.com
Type: CNAME (Canonical name for an alias)
Class: IN (0x0001)
Time to live: 30 minutes
Data length: 14
Primary name: srv1.xyz.com
srv1.xyz.com: type A, class IN, addr 1.2.3.4
Name: srv1.xyz.com
Type: A (Host address)
Class: IN (0x0001)
Time to live: 30 minutes
Data length: 4
Addr: 1.2.3.4
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