3Com OfficeConnect 3C100XF Cli User's Manual

Also see for OfficeConnect 3C100XF: Quick start guide

Contents

3Com OfficeConnect 3C100XF Cli User's Manual Manual pdf 211 page image

27 PACKET FILTERSIntroduction This chapter describes procedures for setting up packet filters for theOfficeConnect Gateway. The following topics are described: Filtering Overview Filter Types Creating Filters Configuring Filters Managing Filters Filter Examples KeywordsFiltering Overview Packet Filters are primarily used in networks that cross organizational or corporateboundaries. They control inter-network data transmission by accepting or rejectingpassage of specific packets through network interfaces based on packet headerinformation.When data packets are received by a network interface, the packet filter analyzesthe packet header information against its set of rules. Based on these rules thatyou define, the filter permits the packet to pass through or discards it.Filtering Capabilities The OfficeConnect Gateway supports the following filtering capabilities: Input and output filtering; packet filters can be created to control inbound oroutbound data packets Source and destination address filtering; a packet filter can accept or denyaccess to a host or user based on the address of the source and / or destination Protocol Filtering; inbound or outbound network traffic can be evaluated basedon the protocol Source and destination port filtering; a packet filter can control what serviceslocal or remote users can access Filtering can be used to control the content of IP Routing Information Packets(RIP) sent / received on specific ports Established session filtering; a packet filter can permit users to connect with aremote network without letting remote users have access to the local network(or vice versa)Filter Types Filters can be classified by the following types: