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Setup multiple IP addresses on PIX

Posted on 2004-10-13
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Last Modified: 2013-11-16
Need to setup multiple "external" IP address on my PIX515.  How do I set this up?  
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Question by:MCHDMISDEPT
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7 Comments
 
LVL 79

Expert Comment

by:lrmoore
ID: 12304941
Can you be more specific in your requirements? You cannot add secondary addresses to a PIX like you can a router.
You can NAT multiple external addresses to multiple internal addresses though, if that's what you need to do..
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Expert Comment

by:JEEGO
ID: 12309124
Only one IP address can be assigned to the external NIC on your PIX 515
But you can assign mulitple addresses to your NAT "pool".
Ex:  ISP has given you the ff: useable IP addresses.
      1.2.3.4 -- 1.2.3.20
 In this case you can assign as ff:
      1.2.3.4                  --> External NIC
      1.2.3.5 - 1.2.3.10   --> Assigned to NAT pool so that internal hosts can browse external resources
      1.2.3.6                  --> Assigned to PAT Backup in case your NAT pool is exhausted
      1.2.3.7 - 1.2.3.15   --> Use for STATIC NAT or STATIC PAT to publish internal resources or create ACL
      1.2.3.16 -1.2.3.20  --> Extra IP's just in case

I hope this answers your question. Assign points to lrmoore. I am just elaborating on his answer.
Search the CISCO website for "pix configurations", and you will find numerous examples.

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Author Comment

by:MCHDMISDEPT
ID: 12311658
Yes.  I am trying to NAT multiple external addresses to multiple internal addresses...please advise
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Author Comment

by:MCHDMISDEPT
ID: 12311698
JEEGO-

Thanks for the input...I am browsing PIX configs right now...
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LVL 79

Expert Comment

by:lrmoore
ID: 12311762
You can create multiple statics:

   static (inside,outside) <public IP1> <private IP1> netmask 255.255.255.255
   static (inside,outside) <public IP2> <private IP2> netmask 255.255.255.255
   static (inside,outside) <public IP3> <private IP3> netmask 255.255.255.255

Example:
    static (inside,outside) 13.45.67.8 192.168.100.100 netmask 255.255.255.255
    static (inside,outside) 13.45.67.9 192.168.100.101 netmask 255.255.255.255
    static (inside,outside) 13.45.67.10 192.168.100.102 netmask 255.255.255.255
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Author Comment

by:MCHDMISDEPT
ID: 12311969
the inside, outside is perfect...now these outside addressess are going to be used for VPN...meaning, a user at home will vpn to 13.45.67.8...the PIX will nat this to a 1710 router thats WAN int is set to a private address on my network, the 1710 supports VPN connectivity.  I belive I need to setup the PIX with sysopt...please advise.
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LVL 79

Accepted Solution

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lrmoore earned 250 total points
ID: 12312121
You need access-lists and sysopt:
Depending on what type VPN's and their requirements:
 IPSEC:
  access-list outside_in permit tcp any host 13.45.67.8 eq 50
  access-list outside_in permit udp any host 13.45.67.8 eq 500
 PPTP:
  access-list outside_in permit gre any host 13.45.67.8
  access-list outside_in permit tcp any host 13.45.67.8 eq 1723
 UNK:
   access-list outside_in permit ip any host 13.45.67.8

Plus the sysopt:
   sysopt ipsec pl-compatible

Question: Why not just terminate the VPN's on the PIX itself? saves the expense of having yet another router on the inside, and takes all the guesswork out of what you need in the acls...
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