Cisco ASA denying traffic on inside interface from inside systems.

Posted on 2014-04-05
Last Modified: 2014-07-19
I have a very strange situation,
ASA5505 in a small office running 8.4(3)
Server (VMware ESXi 5.5.0) with Windows 2008R2 running as a VM. is plugged into the ASA
The ASA is denying icmp and dns packets between the VMware and the Windows server.
they both use the same NIC but obviously have different mac addresses.
If I ssh into the ESXi and try to ping the windows server 1 packet makes it and then the rest are blocked
Source                  Dest                         Message
LNSP-DC1   Deny inbound icmp src inside:LNSP-DC1 dst inside: (type 0, code 0)

here are my access lists:
access-list acl_out extended permit icmp any any
access-list acl_out extended permit tcp object-group MailServers any object-group MailService
access-list acl_out extended deny tcp any any eq smtp
access-list acl_out extended permit ip any any
access-list acl_inbound extended permit icmp any any echo-reply
access-list acl_inbound extended permit icmp any any unreachable
access-list acl_inbound extended permit icmp any any time-exceeded
access-list acl_inbound extended permit icmp any any
access-list acl_inbound extended permit udp any any eq isakmp
access-list acl_inbound extended permit tcp object-group MailFilters object-group MailServers
access-list acl_inbound extended permit tcp any object-group WebServers object-group WebPorts
access-list acl_inbound extended permit tcp any object-group TerminalServers object-group RDCPorts
access-list acl_inbound extended permit tcp any object-group TerminalWorkstation object-group RDCPorts

It is impacting other types of traffic also, ssh, vcenter, etc
It just makes no sense at all....
Any help is greatly appreciated.
Question by:brian_appliedcpu
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1 Comment
LVL 57

Accepted Solution

Pete Long earned 500 total points
ID: 39981117
Is this your problem? Ignore the conflict problems look at the proxy arp bit

IP Address Conflicts with VMware ESX and Cisco ASA
Disable proxy-arp


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