Outlook not working after EOIP

Hi,

I stumbled upon a problem, I wonder if anyone can help me out.

I have Mikrotik router RB750GL which has Mipbsee 6.33.3 and I have set up the wan and lan on dhcp and it worked all fine.

After I went on creating EOIP with another router of mine by creating a tunnel with the LAN mac address and have created bridge and then created a dhcp on the bridge itself so that ip address is given by my main router dynamically. It all worked and both site are connected and no problem.

Now I have realised that my outlook which uses port 110 to receive email is somehow blocked and I am not receiving any email, however the email are being sent using port 25 and no problem with sending it.

I had firewall, before I created the EOIP and the email were working but to check I disabled all the firewall and still the email are not coming through.

Please ask for more detail, if I haven’t specified to diagnose the problem.

Many Thanks

Might be an MTU problem.

Is Outlook trying to connect to the POP3 server using the server’s public IP address or private IP Address?
On your computer, open a cmd prompt and ping the hostname of the POP3 server to see what IP it tries to ping.
My guess is that you’re at site B, the POP3 server is at site A, and now the PPPoE makes you join the network at site A while being located at site B, but that your DNS is still being served from site B, which doesn’t know to give you the private IP of the POP3 server now…

You do have some options -

  1. make DNS give the internal IP
  2. enable hairpin NAT on the site A router for port 110 (and probably port 25 if you’re using the same server for SMTP)

basically, in the NAT table of site A, create a srcnat rule which matches packets whose SRC address is in the LAN IP range, but out-interface = LAN, and make action=masquerade. This will fix the hairpin nat.

Hi,

I think I have not asked the question very clearly. I am at site A
and at current I have disconnected site B. I was using the same Mikrotik router before I have set up tunnel and bridge, the email was working fine. Then I have created a tunnel for EOIP with the mac address of ether 5 (which is our Lan) then created bridge and then created DHCP on the bridge itself. After that setup, I have managed to connect the site A with site B after doing the configuration (both site A and B came in one network) and everything is working fine. But the problem is that email which comes through using port 110 is not coming through or imap which is 143. the firewall setting is still the same as before I set up the eoip. I also disabled the firewall to check but still did not work. However the email is sending through port 25.

It sounds like you have some form of internal DNS which gives the inside IP address of the mail server. That’s fine (and probably better) - Let’s put some real numbers on this.

Give me the IP address of the computer with Outlook on it, and the IP address of the POP3 server that comes back when you try to ping it.