topic Re: Two exchanges in Network Security

Two exchanges

Ahmed Yassin — Mon, 11 Mar 2019 16:42:28 GMT

Dear all,

I have two inside exhanges each with different domain, with two IPs in same VLAN and i have one internet line with real IPs pool in same subnet.

I publish each exchange with a real IP,also, i publish two inside DOMAIN & DNS servers with 2 differnet real IPs(each for each domain).

Problems comes up when one user from one of the two exchanges send a mail to the other user in the other exchange and the other user recieve it, but when the other user send a mail to the first user, the first user don't recieve it.

if there is any suggestions.

Re: Two exchanges

Kureli Sankar — Tue, 24 Nov 2009 22:41:31 GMT

Would you mind clarifying the following:

1. What is Exchange? Microsoft Exchange mail servers?

2. Where is the firewall in the flow?

3. Is the problem not being able to resolve FQDN?

4. a simple topology with IP addresses involved would be good.

Re: Two exchanges

Ahmed Yassin — Wed, 25 Nov 2009 08:58:22 GMT

Here you are the missing info:

1. Both exchanges are Microsoft Exchange mail servers.

2. Firewall position will be shown in the attached daigram.

3. ASA configuraion is attached

Re: Two exchanges

Kureli Sankar — Wed, 25 Nov 2009 13:48:01 GMT

I am still having trouble understanding what the problem is.

Two exchange servers are unable to send e-mails to the other - only one way.

Why do you think this is the firewall problem?

Doesn't this flow happen completely on the inside? The firewall should not come into the picture at all.

Re: Two exchanges

Ahmed Yassin — Wed, 25 Nov 2009 14:37:43 GMT

Every exchange send and recieve to any wher

e outside normally, but, the problem is one of them send and recieve to

the other also normally, but, visa verse no