02-19-2013 05:55 AM - edited 03-07-2019 11:47 AM
Hi All,
I hope this finds you well.
We are having an issues with our Cisco network since re-structuring a week or so ago. In short, we have an Exchange Server (small business servers) on vLAN 101 which is a NAT'd vLAN/Subnet with IP Address 192.1681.1.250 and we have added the port forwards for SMTP etc to allow external mail to be received by the server. This is working fine.
The issue is, is that we have a cPanel Web Server on a different vLAN, ID 100 which has a public IP Address directly. Mail sent from this server to the Exchange Server is lost - I was wondering if we need to add further port forwarding to all the mail through. The Router's running config is as follows:
interface GigabitEthernet0/0
description CORESWITCH-VM-UPLINK
ip address 31.210.XX.XX 255.255.255.248
ip nat outside
ip virtual-reassembly in
duplex auto
speed auto
!
interface GigabitEthernet0/2
no ip address
duplex auto
speed auto
!
interface GigabitEthernet0/2.100
encapsulation dot1Q 100
ip address 31.210.XX.XXX 255.255.255.240
!
interface GigabitEthernet0/2.101
encapsulation dot1Q 101
ip address 192.168.1.254 255.255.255.0
ip nat inside
ip virtual-reassembly in
!
ip nat pool OFFICE 31.210.XX.XXX 31.210.XX.XXX netmask 255.255.255.240
ip nat inside source list 101 pool OFFICE overload
ip nat inside source static tcp 192.168.1.250 25 31.210.XX.XXX 25 extendable
ip nat inside source static tcp 192.168.1.250 80 31.210.XX.XXX 80 extendable
ip nat inside source static tcp 192.168.3.50 430 31.210.XX.XXX 430 extendable
ip nat inside source static tcp 192.168.1.250 443 31.210.XX.XXX 443 extendable
ip nat inside source static tcp 192.168.1.250 3389 31.210.XX.XXX 3389 extendable
ip nat inside source static tcp 192.168.3.50 5050 31.210.XX.XXX 5050 extendable
ip nat inside source static tcp 192.168.4.150 8080 31.210.XX.XXX 8080 extendable
ip route 0.0.0.0 0.0.0.0 31.210.XX.XX
I hope the above makes sense, and I look forward to hearing back from you in the near future.
All the best,
Matthew
02-19-2013 06:43 AM
Hi,
On cPanel server exchange server configured with IP address private or public? I think there should be public IP address 31.210.
Is Default route on the router pointing to ISPs side?
I hope IP addresses are not overlapping on internet facing link and cPanel server.
Check firewalls on both servers.
Sent from Cisco Technical Support Android App
02-19-2013 07:04 AM
Hi there,
The Exchange Server has a private IP Address as it is also a File Server (Small Business Server 2008) and this receives email fine from the outside world.
The cPanel Web Server is on a pulic IP Adreess and again is serving content to the outside world, but emails it sends to the Exchnage Server aren't being received.
We have checked that no Firewalls are interfering.
Matthew
02-19-2013 07:14 AM
Not that's not what I meant.
I mean mails from cpanel are sent to exchange to it's public or private IP address?
If it's public that should be ok.
Sent from Cisco Technical Support Android App
02-19-2013 07:20 AM
Hi there,
I am not sure how you can "tell" a cPanel Web Server to send emails out using a particular IP Address.
Naturally it uses the MX Records, which are actually running on an external DNS Service, to determine where to send emails to.
For the record, the cPanel Web Server sends email fine to the outside world, it is just the emails destined for email accounts held on the Exchange Server aren't being received.
Matthew
02-19-2013 08:52 AM
Hi Matthew,
Have you wiresharked a mail being sent from your cPanel server?? What is the MX record result the server receives?? If you verify the external DNS is giving the right information to the cPanel server, we can cross that off the list and go further, but knowing the actual destination the cPanel server is getting is a good first step.
Kindest Regards,
ALAN
02-19-2013 08:59 AM
Ok, let's do this try to put nat staement under cpanel facing interface
Int g0/2.100
...
Ip nat outside
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