10-09-2005 09:37 PM - edited 03-03-2019 10:41 AM
I trying to configure Cisco's 1841 router acting as gateway with NAT.
I have two ISPs and each of them gives me one IP.
Now I need to configure inside web and DNS servers to be accessible from outside via both ISPs addresses.
I think it is possible to realise by using route-maps with static translations.
Can someone suggest me rigth direction on how exactly it can be done, or some document where I can find additional info?
Here is first string from "show version" command:
"Cisco IOS Software, 1841 Software (C1841-ADVSECURITYK9-M), Version 12.3(8)T7, RE"
10-09-2005 11:02 PM
Hello,
you are right about the route-maps and static translations, have a look at the document below for a sample configuration:
NAT - Ability to Use Route Maps with Static Translations
http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a0080087bac.html
Regarding the DNS, this document might be useful:
White Paper
Enabling Enterprise Multihoming
with Cisco IOS Network Address Translation (NAT)
http://www.cisco.com/warp/customer/cc/pd/iosw/ioft/ionetn/tech/emios_wp.htm
HTH,
GP
10-09-2005 11:19 PM
do you regard own multiple ip block without own your AS and BGPsetting?
10-10-2005 02:34 AM
I don't sure that I understand you rigth
Yes, I didn't own any AS and have only two IP addresses - one from ISP1 and one from ISP2
And because of this I didn't run any routing protocol
10-10-2005 10:42 PM
i guess outgoing traffic from your inside PC, would be probably right action with upper configuration in URL
but, incoming packet to your WEB server(f.e) would choose one direction and 1 IP address from ISP#1 or #2
because you'd get IP1 from ISP#1 is belong to ISP#1s AS, and theother too.
I have no idea 'bout multiple dns records and multiple web servers' diffrent network.
I heard some other vendor's machine works pretty good with like yours.
05-05-2006 03:42 AM
Hello
if u could post ur router configuration so we start a work around based on it , thanx
07-02-2006 04:54 PM
I would really like to take part in this as I have a similar situ. One 1841, two ISPs, AND two /27s. Plan is to program the outside interface on our PIX [which is pointing "out" to the 1841] with IPs from ISP A [a T1]. The primary default gateway on the 1841 points to ISP A. Now, if the T1 goes down, the "plan" is to xlate the STATIC PIX IP to an IP on the address block from ISP2, which is a DSL connection. Since the source address is on the ISP2 network, packets from the PIX going out that way should be OK for inside users ... Yes?
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