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0 00000000 00111111 01011111 01111111 10011111 10111111 11011111 11100000

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third octet (binary)

0 00000000 11111111 11111111 11111111 11111111 11111111 11111111 00000000

2 2 2 2 2 2 2 2

fourth octet (binary)

Ip access-list 1 permit 16010110 0000 Ip access-list 1 permit 16010111 0000 Notice a few things from this example First, the access list includes only two entries Since by default everything else is denied, this might have the unintended side effect that all other IP packets are blocked to servers on segment 2 The network mask of these entries is all zeroes, indicating an exact match (this is the default, so we could have avoided typing the wildcard mask in this example) Also notice how the access list is applied to the outgoing interface on Ethernet1 (E1) The access list could have been applied to interface Ethernet0 (E0) as an inbound access list, but this would have the undesired effect of blocking outbound traffic from all other hosts on segment 1; no hosts other than those specified to be permitted in the access list would be able to send packets outside of segment 1 To see why this is so, imagine how the packets arrive at the router A host on segment 1 with an IP address 16010112 sends a packet to the router interface E0 From the routers' perspective, this packet is incoming from the E0 segment, so it is "inbound" Therefore, it would apply the access list criteria to the packet that would then be denied by the implicit "deny all" Keeping these ideas in mind, let's modify this access list a bit In this modification, we assume that other network segments need access to the servers on segment 2 The modification is shown here: Interface ethernet 1 Ip access-group 1 out Ip access-list 1 permit 160101100000 Ip access-list 1 permit 160101110000 Ip access-list 1 deny 1601010000255 Ip access-list 1 permit any The small modifications change things quite a bit First, we now have an explicit deny statement for every address on network 1601010 This may seem like a contradiction Won't this have the effect of blocking the two nodes we wanted to allow access The answer is no, and the reason is due to the top-down processing of access lists Recall that earlier this was one of our configuration principles Access lists are not "compiled," like program code, and combined Each entry in the access list is read sequentially, from top to bottom for each packet that is processed on an interface Once a match is reached, the remaining access list entries are ignored This is why the order of the entries in an access list is so critical and why you should put the more specific entries first Recall our discussion of this topic earlier in this chapter Once the match is made for the node addresses 16010110 or 16010111, the search is completed and none of the remaining access list entries are examined Notice also that now we have added an explicit "permit any" to the end of this access list This permit statement negates the normal implicit "deny all" This feature should be used with great caution It assumes that explicit deny entries have been created for any packets you want to prevent from transiting a router interface Because the default "deny all" has been overridden, if a packet is not explicitly denied, it would be permitted access through the router interface.

0 00000000 11111111 11111111 11111111 11111111 11111111 11111111 00000000

12063255255 12095255255 120127255255 120159255255 120191255255 120223255255

It is quite easy for periodic SAP advertisements to completely overwhelm a WAN link for many seconds Let's perform some calculations to show how this happens A SAP packet can contain up

Finally, calculate the last valid address used by each of these six subnets by turning off the low-order host bit and leaving all other host bits enabled, as shown in the following table:

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120 120 120 120 120 120 120

second octet (binary)