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Multiple IP addresses on the external interface on a Cisco 851

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kornakmf

Technical User
Aug 21, 2007
19
I need to set multiple IP addresses to the external interface (WAN) on a Cisco 851 router.

Any idea how to do this?

!
interface FastEthernet4
description $FW_OUTSIDE$$ETH-WAN$$ES_WAN$
ip address 66.148.16.244 255.255.252.0
no ip redirects
no ip unreachables
no ip proxy-arp
ip nat outside
ip virtual-reassembly
ip route-cache flow
duplex auto
speed auto
!

I need to add....
66.148.16.245
66.148.16.247
66.148.16.248
66.148.16.249

Thanks
 
Why do you think you need to do that?

Do you need to translate those addresses to internal hosts?


ip nat inside source static inside_address outside_address
 
I have an issue with my ISP were they require my static IP to reside on a device. If they cannot query the device, they time out the IP address after 4 hours.

NAT translation works fine if I cycle the static IP addresses from the router to get the cable modem to provision them, but after 4 hours they are released.

Thanks,
Mark
 
I don't quite understand why they would do that if you are paying for the IP addresses. You can put an addition address on the interface as follows.


interface FastEthernet4
description $FW_OUTSIDE$$ETH-WAN$$ES_WAN$
ip address 66.148.16.244 255.255.252.0
ip address x.x.x.x x.x.x.x secondary
 
You rock. This should solve my problem.
I owe you a beer or 12.

Thanks,
Mark
 
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