V-216668

Discussion

If the static routes to the alternate gateway are being redistributed into an Exterior Gateway Protocol or Interior Gateway Protocol to a NIPRNet gateway, this could make traffic on NIPRNet flow to that particular router and not to the Internet Access Point routers. This could not only wreak havoc with traffic flows on NIPRNet, but it could overwhelm the connection from the router to the NIPRNet gateway(s) and also cause traffic destined for outside of NIPRNet to bypass the defenses of the Internet Access Points.

Check Content

This requirement is not applicable for the DODIN Backbone.

Step 1: Review the IGP and BGP configurations. If there are redistribute static statements configured as shown in examples below, proceed to step 2.

OSPF Example:

router ospf 1
 log-adjacency-changes
 redistribute static subnets
 network 0.0.0.0 255.255.255.255 area 0

EIGRP example:

router eigrp 1
 network 10.1.15.0 0.0.0.255
 redistribute static

RIP example:

router rip
 version 2
 redistribute static
 network 10.0.0.0

BGP example:

router bgp nn
 no synchronization
 bgp log-neighbor-changes
 redistribute static
 neighbor x.11.1.7 remote-as nn
 neighbor x.11.1.7 password xxxxxxx
 no auto-summary

Step 2: Review the static routes that have been configured to determine if any contain the next hop address of the alternate gateway.

If the static routes to the alternate gateway are being redistributed into BGP or any IGP peering to a NIPRNet gateway or any other autonomous system, this is a finding.