inside the host does not ping external host in transparent mode

Hi all I need urgent help on this pls I have host on ip add 1.1.1.2/24 connected inside interface of the pix with ios 7.0 in transparent mode. and the external interface of the pix connected to a router IP 1.1.1.1/24.i enabled icmp inspection.i can see the router arp entry into the host and the host arp entry in the mac address router.both are well learned by the pix. no traffic flow form the host to the router. There is no access on the pix of pix.the list does not create an arp entry in the stange very pix. I tried to manuaaly add the entry:

ARP in 1.1.1.2 0011.d80d.f6ac it gives an error <1.1.1.2>not allowed. network address I do not get it .my question is why the pix don't is not create entry arp. what could be the problem. could someone pls help me with this thanks pls.

Assane

Lol this is not as you mentioned. I'll explain the communication all in detail. I hope this helps.

Assumptions:

PIX configured to L2, with outside as 0 and inside as 100. insidehost on inside the network and external network configured outsidehost.

scenario 1

==========

If pix is not configured with the IP address, all IP packets are dropped and syslog Id 322004: no management IP address configured for transparent

Firewall is saved. So lets see how communication works on L2

outsidehost tries to communicate with insidehost. ARP request is from outsidehost and is sent through dissemination and it is received by PIX and sent to the inside network, without change.

Return of InsideHost and the response is sent through to the outsidehost. When you see the arp on the outsidehost and the insidehost entries you will find the corresponding arp entries.

PIX will forward arp request/reply.

You can give the command "local host" and you won't see any entries created on the box.

2nd scenario

==========

An ip address is configured on pix and insidehost starts communication with the outsidehost. Communication is from top to bottom and will allow pix.

No change in the behavior of the ARP. Exactly as mentioned in scenario 1.

Given that the IP address is provided to the box, entered the local host is created and formed connection for traffic from insidehost to outsidehost.

Connection between outsidehost and insidehost is denied because there is no access list to allow traffic from low to high.

You can give the command "local host" and you will see the entrance to insidehost, outsidehost.

3rd scenario

=============

An ip address is configured, created in order to allow the circulation of outsidehost insidehost and applied to the external interface of access list access list.

No change in the behavior of the ARP. Exactly as mentioned in scenario 1.

Given that the IP address is provided to the box, entered the local host is created and formed connection for traffic from outsidehost to insidehost.

Access list being present to allow the traffic, the connection is allowed and entry is created in the box.

Hope that the foregoing erases the entire communication L2 and the communication of different security levels.

I hope this helps.

Tags: Cisco Security

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