I have a subnet (192.168.12.0) that for some reason the workstations cannot access the mail server (located on the dmz) to retrieve or send mail. The workstations can get internet and any other services but not mail. I have checked the firewall but no changes have been made on the access list. I have 50 subnets or VLANs, and all are working fine expect for this one. I have used extend ping, but get no results. I have used traceroute, packets drop at VLAN interface(all vlan interface are on a core switch). I used wireshark to analyze further and I get resets from mail server. What else can I used to get a understanding of why the mail packets are dropping all of a sudden
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