Skip to main content

How could I add NAT with private subnet to this Cisco 2500 config?

itemprop="text">

There's this Cisco 2500 with one V.35
port going to an HDSL DCE, and the ethernet port to a Cisco PIX; there are also other
IPs (subnet 80.something) in the configuration on the serial side that are used to route
traffic to the DSL provider.



I'm wondering if it
is possible to remove the PIX and move everything on the Cisco 2500 - I can usually
manage to do this when the public IP is on the wan-facing port and the private IP on the
lan one, but I don't know how could I add a private IP to the 2500 and use the public
one for nat when they're both on the same internal
interface.




The current config for the
2500 looks like:



ip
            subnet-zero
!
interface Ethernet0
 description connected
            to PIX
 ip address 217.x.x.1 255.255.255.248
 ip nat
            inside
 no ip directed-broadcast

 no ip
            mroute-cache
 no cdp enable
!
interface Serial0

            no ip address
 no ip directed-broadcast
 no ip
            mroute-cache
 encapsulation frame-relay
 bandwidth 1024

            no cdp enable

!
interface Serial0.1
            point-to-point
 ip address 80.x.x.x 255.255.255.252
 ip nat
            outside
 frame-relay interface-dlci xxx IETF
 bandwidth
            1024
 no ip directed-broadcast
 no cdp
            enable
!
ip classless

ip route 0.0.0.0 0.0.0.0
            Serial0.1


The PIX has
217.x.x.2 on its WAN interface and uses the 2500's 217.x.x.1 as default
gateway.



I would like to remove the PIX and
connect the LAN directly to the Cisco 2500, which would have 192.168.1.1/24 on its
Ethernet port and NAT everything out from one of the 217.x.x.X IPs. After that I will
probably want to also add other static IPs to the Cisco from the 217.x.x.X/29 subnet and
use them to portforward some services to internal servers.



Answer




There's lots of documentation on cisco.com about NAT
services.



Try starting
at:




href="http://www.cisco.com/en/US/partner/prod/collateral/iosswrel/ps6537/ps6586/ps6640/prod_qas0900aecd801ba55a.html"
rel="nofollow
noreferrer">http://www.cisco.com/en/US/partner/prod/collateral/iosswrel/ps6537/ps6586/ps6640/prod_qas0900aecd801ba55a.html



As
a general guide, you would want 'ip nat outside' on s0/0.1, 'ip nat inside' on
e0.



You would make a NAT pool using your
217.x.x.1/29 addresses, that things on the inside could use. They would not appear on an
interface anymore.


Comments

Post a Comment

Popular posts from this blog

linux - iDRAC6 Virtual Media native library cannot be loaded

When attempting to mount Virtual Media on a iDRAC6 IP KVM session I get the following error: I'm using Ubuntu 9.04 and: $ javaws -version Java(TM) Web Start 1.6.0_16 $ uname -a Linux aud22419-linux 2.6.28-15-generic #51-Ubuntu SMP Mon Aug 31 13:39:06 UTC 2009 x86_64 GNU/Linux $ firefox -version Mozilla Firefox 3.0.14, Copyright (c) 1998 - 2009 mozilla.org On Windows + IE it (unsurprisingly) works. I've just gotten off the phone with the Dell tech support and I was told it is known to work on Linux + Firefox, albeit Ubuntu is not supported (by Dell, that is). Has anyone out there managed to mount virtual media in the same scenario?
Post a Comment
Read more

hp proliant - Smart Array P822 with HBA Mode?

We get an HP DL360 G8 with an Smart Array P822 controller. On that controller will come a HP StorageWorks D2700 . Does anybody know, that it is possible to run the Smart Array P822 in HBA mode? I found only information about the P410i, who can run HBA. If this is not supported, what you think about the LSI 9207-8e controller? Will this fit good in that setup? The Hardware we get is used but all original from HP. The StorageWorks has 25 x 900 GB SAS 10K disks. Because the disks are not new I would like to use only 22 for raid6, and the rest for spare (I need to see if the disk count is optimal or not for zfs). It would be nice if I'm not stick to SAS in future. As OS I would like to install debian stretch with zfs 0.71 as file system and software raid. I have see that hp has an page for debian to. I would like to use hba mode because it is recommend, that zfs know at most as possible about the disk, and I'm independent from the raid controller. For us zfs have many benefits,
Post a Comment
Read more

apache 2.2 - Server Potentially Compromised -- c99madshell

So, low and behold, a legacy site we've been hosting for a client had a version of FCKEditor that allowed someone to upload the dreaded c99madshell exploit onto our web host. I'm not a big security buff -- frankly I'm just a dev currently responsible for S/A duties due to a loss of personnel. Accordingly, I'd love any help you server-faulters could provide in assessing the damage from the exploit. To give you a bit of information: The file was uploaded into a directory within the webroot, "/_img/fck_uploads/File/". The Apache user and group are restricted such that they can't log in and don't have permissions outside of the directory from which we serve sites. All the files had 770 permissions (user rwx, group rwx, other none) -- something I wanted to fix but was told to hold off on as it wasn't "high priority" (hopefully this changes that). So it seems the hackers could've easily executed the script. Now I wasn't able
Post a Comment
Read more