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1 to 1 NAT problems

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stevet
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1 to 1 NAT problems

I have just moved our comcast service to a new location.  The old and new each had 5 static IP addresses that I had working at our old location with cascaded NAT settings.

 

Connected to the comcast CG3000DCR gateway is my Netgear FVS338 VPN router.

 

On my old comcast box I had 1-1 NAT set up for

aa.bb.cc.73 -> 192.168.1.99   (This is the Netgear FVS338 and used for VPN)

aa.bb.cc.74 -> 192.168.1.101

aa.bb.cc.75 -> 192.168.1.102

 

aa.bb.cc.76 -> 192.168.1.103

aa.bb.cc.77 -> 192.168.1.100

 

My Netgear FVS338 has similar 1-1 NAT set to direct those 5 addresses to computers on the LAN side in the 192.168.10 subnet and all was working just fine.

 

When we moved to a new location I had temporarily set up another VPN between our old and new locations with a TPLink router at the new location behind the CG3000DCR to handle the VPN

 

When we got to the point of moving our servers to the new building, I switched my 2 routers so that the FVS338 was at the new location.  Since that CG3000DCR had the lan side set with the 10.1.10 subnet, I had to modify the 1-1 NAT on the FVS338 accordingly to match the 1-1 NAT that I set on the CG3000DCR:

 

dd.ee.ff.73 -> 10.1.10.5 (new address for the FVS338)

dd.ee.ff.74 -> 10.1.10.6

dd.ee.ff.75 -> 10.1.10.7

dd.ee.ff.76 -> 10.1.10.8

 

dd.ee.ff.77 -> 10.1.10.9

 

I had experienced a lot of problems getting my VPNs to connect reliably to the FVS338 for the 1st week, but now they seem to be connecting OK  I have 1 location with a static IP and 2 others with dynamic IPs that are connected so my .34 public address does seem to be working.

 

I cannot seem to connect (from an outside IP address) to any of the other 4.  As far as I can tell I have the same settings on the Comcast router as I had at my old location other than the different addresses.  The strange thing is that a week ago for a period of about a half hour I was able to access all 5 of the public addresses (by using VNC to connect over my VPN to a remote PC and then trying to access via the public static IPs) and then without making any changes to either router it suddenly stopped working and has not worked since.

 

The comcast router shows that it has the /29 for 5 static addresses.

 

If I connect a computer directly to the comcast cable modem outside of my FVS338 so it is in the 10.1.10 subnet it can see all of the 1-1 NAT computers that I configured on the FVS338 so I know those are getting outside of that router.

 

I don't know what to try next.  Could there be something on COmcast's end that is only giving me the 1 static IP address instead of the 5 even though my router is configured for 5?  That woudl seem odd since the router's address is .78 and if only 1 was assigned I would have expected it to be .74

 

both the Disable Firewall and Disable Smart Packet Detection are checked.

 

Thanks for any help,

Steve Tyrakowski

 

 

Accepted Solution

Re: 1 to 1 NAT problems

Hi stevet.  The config info provided appears correct for 1 to 1 NAT.  If you will send me a private message (PM ) with account info for the new location, I will have our support team investigate this issue.

 

Thank You

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Accepted Solution

Re: 1 to 1 NAT problems

I replied to you with a private message and gave you a phone number that you requested more than a week ago, but it says you have not read that message yet.

 

I still cannot get any of my static IPs to work with 1-1 NAT except for my Netgear VPN router

 

Is there some place online to start a support request?  The telephone menus, muzak and wait times are extremely annoying and I never got to talk with anyone after 10 minutes

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stevet
Visitor

Re: 1 to 1 NAT problems


stevet wrote:

 

On my old comcast box I had 1-1 NAT set up for

aa.bb.cc.73 -> 192.168.1.99   (This is the Netgear FVS338 and used for VPN)

aa.bb.cc.74 -> 192.168.1.101

aa.bb.cc.75 -> 192.168.1.102

aa.bb.cc.76 -> 192.168.1.103

aa.bb.cc.77 -> 192.168.1.100

 

Those are actually cc.61 thru cc.57 not that it matters for illustration purposes

 

 so my .34 public address does seem to be working.

 

And that should have said .73 seems to be working 

 

And I called our old location and the old comcast router was an SMC8014 and my new one is a CG3000DCR so perhaps that is part of the problem.  STill don't know what to try next.

 

Community Manager
Community Manager

Re: 1 to 1 NAT problems

Hi stevet.  The config info provided appears correct for 1 to 1 NAT.  If you will send me a private message (PM ) with account info for the new location, I will have our support team investigate this issue.

 

Thank You

stevet
Visitor

Re: 1 to 1 NAT problems

I replied to you with a private message and gave you a phone number that you requested more than a week ago, but it says you have not read that message yet.

 

I still cannot get any of my static IPs to work with 1-1 NAT except for my Netgear VPN router

 

Is there some place online to start a support request?  The telephone menus, muzak and wait times are extremely annoying and I never got to talk with anyone after 10 minutes

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