Research by ASA & ISP address space

Hi all

Maybe a stupid question. One of my clients planning on creating RDP access to some servers sitting on 'Inside' of ASA5510. Customer asked pulic ISP 24 address space and had a 1.1.1.0/24 (ips changed). In addition, ISP customer provided with ASA ouside I / f IP: 2.2.2.2/30 and default gateway for ASA (modem Internet service providers) such as 2.2.2.1/30.

So what is the best way to use the ISP assigned public IPs to provide RDP access to servers on the inside... ? Can I assign 1.1.1.1/24 to ASA inside and can create a "No. NAT' to access internet and RDP.

Or I thought initially to have NAT with ip pvt in-house system (wasn't aware of public ip address space required). So is it possible using the same ip address space pvt and assigned/24 ip addresses to create Internet/RDP access?

Help for config links is appreciated.

Thank you inadvance

MS

"I thought initially to have NAT with ip pvt in-house system (wasn't aware of public ip address space request)." Is it so possible using the same pvt ip address space and assigned/24 ip addresses to create Internet/RDP

access? "

Upsolutely possible and the best to do as you have thought about it.

If I understand correctly: Please correct me otherwise!

1. you have ASA5510, outside of the interface with the IP public 2.2.2.2/30

2 - ISP router with IP 2.2.2.1/30

Gives 3 - Customer ISP 254 public IP addresses using client on another beach 1.1.1.0/24

Well, you can do the following if you do not have inside the configured IP interface.

1 - ASA5510 inside can be any subnet ip to any of the reserved private beaches. For your inside interface you can use one of the below private beaches.

i 10.0.0.0 through 10.255.255.255

II - 172.16.0.0 to 172.31.255.255

III - 192.168.0.0 to 192.168.255.255

Assume that you have inside the 172.16.1.1/24 interface

If you have:

ASA5510 outside interface IP: 2.2.2.2/30

ASA5510 inside the interface IP: 172.16.1.1/24

for your ISP services new public IP range just create your one-to-one NAT in ASA5510

translations by using the new IP address of the ISP. Note that the ISP should route the new public IP address space to your ASA5510 outside interface, Im sure they know that.

As said, just create your static nat using the new public IP address, you can also create

If necessary global nat pools.

for example RDP access from outside with the public IP 1.1.1.100 coordinated to 172.16.1.50 PC inside the host

static (inside, outside) 1.1.1.100 172.16.1.50 netmask 255.255.255.0 0 0

outside_access_in list access permit tcp any host 1.1.1.100 eq 3389

Access-group outside_access_in in interface outside

for example, creating additional pools of global variables using the new IP PAT range.

Global 1.1.1.50 - 1.1.1.74 2 (outdoor)

Global (outside) 2 1.1.1.75

Rgds

Jorge

Tags: Cisco Security

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