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How to pass through the firewall the remote control OptiView? - Firewall, remote control, OptiView-communications industry
Background:
When an internal network access to the Internet when possible with 50000 unknown networks and user generated physical connection, to open these connections can use a variety of applications and sharing of information, although certainly not in the majority of the content shared outside the Internet for the hacker theft of information and destruction of a vast network of space, so as to connect into the Internet security concerns.
Why use a firewall
Outside the firewall is to restrict user access to their networks through the Internet, a security mechanism is a set of rules for packet filtering, allowing the desired data through, preventing unwanted traffic. Most of the firewall configuration by appropriate, based on access control list (ACL) and pipeline (Conduit) check the relevant information packet and then forwarding the packet.
(Translator Note: The pipeline is a virtual circuit through the firewall, which allows external machines to start a connection inside the machine. Each pipeline is a potential threat, therefore, must be under the requirements of security policy and operational restrictions on its use. If possible, you can use the remote source address, destination address and the agreement of local restrictions. ACL is a network device (such as routers or switches) through a series of PERMIT, DENY statement to filter data packets method. In order to reduce the necessary access, should be carefully configured access list. If possible, should use the remote source address, destination address and the local agreement to impose more restrictions on access list.)
If you do not match the access control list (ACL) and pipeline (Conduit) request, the firewall will discard the packet. Access Control List (ACL) and pipeline (Conduit) to meet the requirements defined frame, these frames must meet the network can accept the rules. General setting that can meet the requirements, you can also set specific. For example, the firewall in the pipeline in general it allows the network to all the traffic through, do not limit any source host and destination host. In particular settings, it allows the IP address pipeline only to 45.30.155.30 host through UDP protocol 161 (SNMP) port and IP address of 10.17.2.30 for the internal network host communication. Result, only between the two host SNMP traffic can pass through the firewall.
How to configure the firewall to remote access
Remote access through the firewall OptiView Protocol Analyzer to note a few things. Administrator wants to add 12 in the firewall configuration statements, unless the firewall is open to all applications.
First, OptiView Protocol Analyzer requires a public IP address. When using private addresses in the internal network, many network administrators will use Network Address Translation (NAT) method to deal with, so can thousands of individual and private use of the address of the network into one or a few public address network. Network Address Translation (NAT) is the role of the internal interface of the host address translation associated with the external interface, the "global address", so to prevent the host address exposure to other network interfaces. If you choose to use NAT to protect internal host addresses, should first establish a set for the conversion of the address above.
(Translator's Note: For internal systems, NAT can change out transmission of the packet's source IP address. It supports both static and dynamic conversion conversion. NAT allows the internal system for the distribution of private addresses, or to retain existing invalid address . NAT can also improve security, because it hides the external network to the real network identity of internal systems.)
Time when using NAT, OptiView Protocol Analyzer requires a static NAT table. If, NAT to dynamically use the actual address from the address of a designated section, such internal hosts will not always get the same external address. OptiView Protocol Analyzer from the address mapping table to get a fixed address, this fixed address, allowing outside access to its host. If you do not use NAT, then the OptiView Protocol Analyzer to work with the current address. Once the OptiView Protocol Analyzer by the static NAT table to determine the address of the firewall requires some configuration, if the OptiView Protocol Analyzer allows remote users to access WEB form, it allows the HTTP service must.
Figure 1: OptiView Protocol Analyzer in the Internet address is 45.30.1.1
HTTP traffic to TCP-based connections, the default service port for the TCP80 port, so be open OPTIVIEW 80 port protocol analyzer, for example, all hosts can access through port 80 OptiView Protocol Analyzer can also only allow one host access through port 80 OptiView Protocol Analyzer.
In Figure 2, the host 200.200.200.1 trying to remote access OptiView Protocol Analyzer, firewall will check the information of the matching, if adopted, will be converted by an internal NAT OptiView Protocol Analyzer addresses and communication.
Remote users need to download the remote user interface program, and then installed in the current host, the program can use E-mail or other file transfer mode operation OptiView Protocol Analyzer. Users must download remote control software, remote control interface uses TCP, port 1695, so the firewall must open the ports.
Example, in Figure 3 is the local firewall configuration. Many administrators prefer to control traffic entering and leaving, so that the local firewall, remote user interface is likely to be blocked.
Firewall is Network Security Important way, because the presence of many security vulnerabilities, hackers into your network will have many paths, from the outside to the information must be strictly controlled. This agreement on the OptiView Analyzer Remote Operation must be very careful strict, if the remote host's address is known, then the administrator must be specified in the configuration. When set to change, we must carefully verify, or simply sloppy configuration will be attracted by hackers. [Key words]: Firewall Remote Control OptiView Comment Large In Small
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