Any kind of filtering on the router?
-----Original Message-----
From: Steve Van Eck [mailto:[EMAIL PROTECTED]]
Sent: Friday, October 26, 2001 12:01 PM
To: Exchange Discussions
Subject: smtp problems
I have an interesting problem that I hope you can shed some light on. I am
running W2K, SP2 and Exchange 5.5. This box has a IP that sits directly on
our T1, the router is the only thing between it and the ISP. We recently
have been unable to receive email from SOME of our clients. I am unable to
telnet to port 25 on the exchange box from the outside world, I can telnet
to it on our segment. I have a sniffer on the segment and am getting quite a
few port unreachable errors.
Header of packet that caused error follows.
IP Header - Internet Protocol Datagram
Version: 4
Header Length: 5 (20 bytes)
Type of Service: %00000000
Precedence: Routine, Normal Delay, Normal Throughput, Normal
Reliability
Total Length: 98
Identifier: 54627
Fragmentation Flags: %000 May Fragment Last Fragment
Fragment Offset: 0 (0 bytes)
Time To Live: 128
Protocol: 17 UDP
Header Checksum: 0x0000
Source IP Address: 66.xx.xxx.xxx
Dest. IP Address: 207.xxx.xxx.xxx
No IP Options
UDP - User Datagram Protocol
Source Port: 137 NETBIOS Name Service
Destination Port: 137
Length: 58
Checksum: 0x0000
NetBIOS Name Service - Network Basic Input/Output System
Identification: 0x0000
Parameter: 0x0000
Request
Standard Query
A FreeBSD box on the same network is able to accept the mail, it is listed
as the secondary MX record. Your help is much appreciated. Steve Van Eck
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