IT Baseline Protection Manual - The Information Warfare Site

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Safeguard Catalogue - Communications Remarks ____________________________________________________________________ ......................................... If, contrary to the example, the value ah was set for the parameter auth, IP packets with protocol number 51 must be allowed through. Any other communication with the gateway or the local network must be prevented by the relevant firewall system. As the firewall system and the gateway are implemented so that they are separate from each other, the parameters leftfirewall and rightfirewall, plus leftupdown and rightupdown are not used. Where Network Address Translation (NAT) is used, it should be noted that address translation must be performed either on a component between the gateway and the local network or on the gateway itself. Generally the addresses cannot be translated within the firewall system. The reason for this is that parts of the IP packets are modified when NAT is used, so that IPSEC integrity checking generally will not work. NAT may therefore only be performed "behind" the IPSEC gateway. If address translation is to be performed on the same IT system on which FreeS/WAN is also operated, it should be noted that this will make processing of the IP packets on that IT system very complex. Information on this point will be found in the FreeS/WAN documentation. It is therefore simpler and administration is also easier if NAT is carried out on a separate component between the gateway and the local network. VPN functional test Before the VPN is used in actual operations, it is necessary to check that it is functioning as desired. During the test phase, instead of the two local networks only test computers should be connected to the gateways. Otherwise the possibility that "real" data will be sent unprotected over the Internet if the VPN does not function correctly straightaway cannot be excluded. It is necessary to check that the packets are really encrypted. As described in the documentation, the simplest way of doing this is using the tools ping and tcpdump. The ping tool enables IP packets which are easy to detect to be generated, while tcpdump can be used to monitor the network traffic generated by FreeS/WAN. It should be noted that the ping command must be run on the test computer and not on the gateway. In the present configuration example, the VPN only protects the traffic between the local networks (which are replaced during the test phase by one or more test computers) and not the traffic from or to the gateways. (See also "Remote administration of a gateway" above on this point.) The command tcpdump for monitoring the network traffic generated can be run on any IT system between the two gateways. If the VPN is not functioning as desired, for example no communication is possible or the network traffic is not encrypted, FreeS/WAN provides a number of diagnostic tools. For example, information on the status of the software program can be obtained from examining the contents of the pseudofile /proc/net/ipsec_tncfg and by running the command ipsec look. Further information on this subject is contained in the FreeS/WAN documentation. ____________________________________________________________________ ......................................... IT-Baseline Protection Manual: Oktober 2000
Safeguard Catalogue - Communications Remarks ____________________________________________________________________ ......................................... Additional controls: - Is FreeS/WAN run on stand-alone IT systems on which the minimum Linux operating system functionality has been installed? - Have steps being taken to ensure that private RSA keys never leave the gateways? - Has the VPN been tested for correct operation prior to operation for real? ____________________________________________________________________ ......................................... IT-Baseline Protection Manual: Oktober 2000
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