Cisco 7609-S Configuration Guide - Page 510
SMTP and Extended SMTP Inspection
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SMTP and Extended SMTP Inspection Chapter 22 Applying Application Layer Protocol Inspection hostname(config)# access-group voice in interface outside hostname(config)# access-group voice in interface inside Configure SCCP (Skinny) inspection: hostname(config)# policy-map global_policy hostname(config-pmap)# class inspection_default hostname(config-pmap-c)# inspect skinny Output of show skinny when Skinny phone call through the firewall module is active: hostname(config)# show skinny LOCAL FOREIGN STATE 1 10.0.0.2/49723 209.165.201.210/2000 1 AUDIO 209.165.201.2/24002 209.165.201.211/19212 2 209.165.201.210/2000 209.165.201.211/49692 1 AUDIO 10.0.0.2/24002 209.165.201.211/19212 Output of show conn when there is one active phone call between Skinny phones, each reachable through inside and outside interfaces. Skinny connections are marked by a k flag. hostname(config)# show conn 3 in use, 26 most used Network Processor 1 connections TCP out 209.165.201.210:2000 in 10.0.0.2:49723 idle 0:00:07 Bytes 10232 FLAGS - UOI Network Processor 2 connections TCP out 209.165.201.211:49692 in 209.165.201.210:49723 idle 0:00:27 Bytes 12394 FLAGS UBOI UDP out 209.165.201.211:19212 in 10.0.0.2:24002 idle 0:00:00 Bytes 3575654 FLAGS - K Multicast sessions: Network Processor 1 connections Network Processor 2 connections IPV6 connections: SMTP and Extended SMTP Inspection This section describes how to enable SMTP and ESMTP application inspection and change the default port configuration. This section includes the following topics: • SMTP and Extended SMTP Inspection Overview, page 22-94 • Configuring and Enabling SMTP and Extended SMTP Application Inspection, page 22-96 SMTP and Extended SMTP Inspection Overview The FWSM supports application inspection for SMTP and ESMTP. Application inspection for these protocols protects against attacks by restricting the types of SMTP or ESMTP commands that can pass through the FWSM and by adding monitoring capabilities. ESMTP is an enhancement to the SMTP protocol and is similar to SMTP. For convenience, the term SMTP is used in this document to refer to both SMTP and ESMTP. The application inspection process for ESMTP includes support for SMTP sessions. Most commands used in an ESMTP session are the same as those used in an SMTP session but an ESMTP session is considerably faster and offers more options related to reliability and security, such as delivery status notification. 22-94 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM OL-20748-01
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