在防火墙配置中,undo firewall packet-filter basic-protocol enable命令的作用是取消对基本协议包过滤功能的启用。这意味着防火墙将不再对基本协议(如ICMP、TCP、UDP等)的数据包进行过滤。 命令解释: undo:表示取消之前的配置。 firewall packet-filter:指定对防火墙的包过滤功能进行操作。 basic-protocol:表示基本协议...
Whether BGP, BFD, DHCP, DHCPv6, LDP, and OSPF are controlled by security policies is determined by the basic protocol control switch (which can be configured using the firewall packet-filter basic-protocol enable command). To quickly access a network, you can run the undo firewall packet-fil...
A packet-filter firewall uses an ACL to filter IP packet. For each IP packet to be forwarded, the firewall first obtains the header information of the packet, including the number of the upper layer protocol carried by the IP layer, the source address, destination address, source port numbe...
Application layer protocol that is mapped to a port PORT Number of the port for the application layer protocol ACL Number of the ACL specifying the host range TYPE Port mapping type, system predefined or user customized firewall packet-filter ...
Modify an interzone between zone1 and zone2, filter the inbound packets by ACL 3002, apply ASPF to the RTSP protocol, and configure the security policy to security. Name of the other security zone included in the interzone zone2 Whether to enable firewall in the interzone true Packet filter...
Packet-filtering firewalls provide a way to filter IP addresses by either of two basic methods: 1. Allowing access to known IP addresses 2. Denying access to IP addresses and ports By allowing access to known IP addresses, for example, you could allow access only to recognized, established IP...
Basic firewall information Firewalls work by inspecting incoming packets, and comparing them against the following set of rules: The packet meets the standards dictated by the rules, then the firewall passes the packet to the TCP/IP protocol for more processing. The packet doesn't meet the stan...
Basic Firewall Information Firewalls work by inspecting incoming packets, and comparing them against a set of rules. If the rules allow the packet, the firewall passes the packet to the TCP/IP protocol for additional processing. If the rules do not allow the packet, the firewall discards the...
The information that the packet filter uses to make its decision includes the IP address of the source and/or destination computer(s) and the Transmission Control Protocol (TCP) or User Datagram Protocol (UDP) port number. (Yes, the port numbers are in the transport layer header, so technica...
Filter - 输入 IP 地址,以便过滤显示的结果。 Name - 指示后面的参数指定目标主机或网络的名称。 IP Address - 指示后面的参数指定目标主机或网络的接口、IP 地址和子网掩码。 Netmask - 选择应用于该 IP 地址的标准子网掩码。此参数在您选择 IP Address 选项按钮时显示。