The ISSO/NSO will ensure premise router interfaces that connect to an AG (i.e., ISP) are configured with an ingress ACL that only permits packets with destination addresses within the sites address space.

Any enclave with one or more AG connections will have to take additional steps to ensure that neither their network nor the NIPRNet is compromised. Without verifying the destination address of traffic coming from the site’s AG, the premise router could be routing transit data from the Internet into the NIPRNet. This could also make the premise router vulnerable to a DoS attack as well as provide a backdoor into the NIPRNet. The DOD enclave must ensure that the premise router’s ingress packet filter for any interface connected to an AG is configured to only permit packets with a destination address belonging to the DOD enclave’s address block.