Cisco 881V Uživatelský manuál stáhnout pdf (Strana 3)

WAN Failover: Cisco 881 and AirLink ES440

Rev 1 Sep.14 3

6. Configure the WAN interface IP.

7. Configure the NAT rules to allow access to the Internet.

Note: If desired, you can add new criteria for the access list.

8. Configure the failover mechanism.

interface

FastEthernet4

description "Primary WAN interface"

no ip address

ip dhcp client route track 22

ip address dhcp

no shutdown

The interface for the ISP

The routes implied by DHCP configuration

Enable DHCP client on this interface.

will be deactivated if track 22 fails.

interface FastEthernet4

ip nat outside

ip nat enable

interface vlan 1

ip nat inside

ip nat enable

interface vlan 2

ip nat inside

ip nat enable

ip nat inside source list 8 interface

FastEthernet4 overload

access-list 8 permit 192.168.1.0 0.0.0.255

access-list 8 permit 192.168.13.0 0.0.0.255

Traffic going out this interface goes to the Internet.

Traffic going out this interface stays in the LAN.

Enable NATing for this interface.

NAT should be applied to traffic that transits through FE4

and matches the access list below. Overload means the

same outside IP can be used several times.

Traffic from PC

Traffic from ES440

ip routing

ip route 8.8.8.8 255.255.255.255

DHCP

ip sla 33

icmp-echo 8.8.8.8 source-interface

FastEthernet4

threshold 500

timeout 500

frequency 1

ip sla schedule 33

life forever start-time now

track 22 ip sla 33

reachability

delay down 3 up 1

Enable IP routing.

Add a static route to force ping through ISP

Object that generates the ping

Ping Google DNS through FE4. (Google DNS can be

Timeout after 500 ms

Ping every 1 sec.

Start ping now until always

Object that verifies ping was successful

Wait 3 consecutive seconds of ping failures before

changing the state to down; wait 1 sec. before

changing to up. (This avoids repetitive ups and downs.)

considered a reliable Internet host.)

(gateway obtained from DHCP).

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