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New Member

How works the ICMP in 6500 CSM module?

It may dummy question but want to understand how the ICMP works in 6500 CSM module. what configuration required to be able to ping to the real server from client?

-client=1.1.1.0, has MSFC interface

-server=2.2.2.0, no MFSC interface

-6513 routing table=ip route 2.2.2.0 255.255.255.0 1.1.1.1

-->looks need the vserver with "any"(correct me if I'm worng) for the request traffic but how return the ICMP packet from the server.

!

vserver test

virtual 1.1.1.100 any

Thanks in advance,

1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: How works the ICMP in 6500 CSM module?

in routing mode, the CSM will block traffic going directly to the servers.

To allow this traffic you need to create a serverfarm to ROUTE the traffic and associated this server farm to a catch-all vserver.

ie:

serverfarm ROUTE

predictor forward

no nat server

!

vserver catch-servers

virtual 1.1.1.0 /24 any

serverfarm route

inservice

!

The vserver should catch a subnet, not real host ip address.

The response from the server will be forwarded to the client because the ping request from the client will create/open the connection both ways.

Gilles.

3 REPLIES
Cisco Employee

Re: How works the ICMP in 6500 CSM module?

in routing mode, the CSM will block traffic going directly to the servers.

To allow this traffic you need to create a serverfarm to ROUTE the traffic and associated this server farm to a catch-all vserver.

ie:

serverfarm ROUTE

predictor forward

no nat server

!

vserver catch-servers

virtual 1.1.1.0 /24 any

serverfarm route

inservice

!

The vserver should catch a subnet, not real host ip address.

The response from the server will be forwarded to the client because the ping request from the client will create/open the connection both ways.

Gilles.

New Member

Re: How works the ICMP in 6500 CSM module?

Hello,

What's the answer for bridge mode? What's needed to ping directly from client to realserver and vice versa?

Your input is really appreciated.

/David

Cisco Employee

Re: How works the ICMP in 6500 CSM module?

David,

in bridge mode, if the client and server are in the same subnet, the client will send traffic directly to the server destination mac address and the CSM will bridge/forward the traffic.

Gilles.

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