TW-H6W1IR ISDN Remote Router
Configuration and Management 71
2. drop – this drops (doesn’t allow routing for) a specific packet
that has met the criteria of the corresponding filter.
3. disable – this does not apply the IP filter.
?? Interface – this applies the filter to a specific interface, LAN or
one of the ISDN interfaces.
?? Protocol Type – this is a protocol identifier, as assigned by the
Internet Assigned Numbers Authority (IANA). The values of this
identifier are described in RFC-1700. This router supports the
following:
4. protocol type = 1, this is Internet Control Message (ICMP),
defined in RFC 792.
5. protocol type = 6, this is Transmission Control (TCP), defined
in RFC 793.
6. protocol type = 17, this is User Datagram (UDP), defined in
RFC 798.
?? Src IP – this is the source address in the IP header of this packet.
?? Src Netmask – this mask is bit-wise AND’d with the source IP
address and bit-wise AND’d with the IP address of the incoming
interface. The two results are then compared.
?? Dst IP – this is the destination address in the IP header of the
packet.
?? Dst Netmask – this mask is bit-wise AND’d with the destination
IP address and bit-wise AND’d with the IP address of the
incoming interface. The two results are then compared.
?? Dst Port – this is the destination port, in the TCP or UDP header,
of the packet.
