Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




82 posts

Master Geek

Trusted

Topic # 151242 18-Aug-2014 22:09
Send private message

Hello, I have a client PC in the 192.168.3.0/24 network behind a Fortigate firewall which performs NAT.
This firewall is likewise connected on the 192.168.4.0/24 network to my ADSL router which also performs NAT.
So I have double NAT going on from my client PC, out to the internet.

My client PC can ping it's default gateway on the 192.168.3.0 network (Fortigate firewall interface 192.168.3.254). My client can also ping to the internal interface of the ADSL router (192.168.4.254). But my client cannot ping out to the internet.

It would seem that double NAT is causing this. My question is how does double NAT prevent the pings from the client to the internet working ?

Thank you for any help in me understanding this.

Create new topic
392 posts

Ultimate Geek
+1 received by user: 205

Subscriber

  Reply # 1110895 18-Aug-2014 22:44
One person supports this post
Send private message

Switch the ADSL router to bridge mode? Double NAT is a nightmare.

423 posts

Ultimate Geek
+1 received by user: 79


  Reply # 1111043 19-Aug-2014 08:46
Send private message

Double NAT isn't recommended but should work okay, certainly for ping anyway!

I would do a traceroute from your client PC and see where the traffic is stopping. On your Fortigate I assume you have the routing set such that it knows to send everything to the upstream router?

Matt

 
 
 
 


Try Wrike: fast, easy, and efficient project collaboration software
2503 posts

Uber Geek
+1 received by user: 928

Subscriber

  Reply # 1111045 19-Aug-2014 08:48
Send private message

Is it just ping that doesn't work, or all traffic? If it's just ping, I would suggest one (or both) of the devices have rules around ICMP traffic (or lack of relevant rules).




Windows 7 x64 // i5-3570K // 16GB DDR3-1600 // GTX660Ti 2GB // Samsung 830 120GB SSD // OCZ Agility4 120GB SSD // Samsung U28D590D @ 3840x2160 & Asus PB278Q @ 2560x1440
Samsung Galaxy S5 SM-G900I w/Spark

2375 posts

Uber Geek
+1 received by user: 690

Trusted
Subscriber

  Reply # 1111073 19-Aug-2014 09:23
Send private message

+1 for one of the routers blocking the PING.  Having several layers of NAT is not fantastic but it should not cause significant issues either as best I am aware.




"4 wheels move the body.  2 wheels move the soul."

“Don't believe anything you read on the net. Except this. Well, including this, I suppose.” Douglas Adams

Create new topic



Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Exhibition to showcase digital artwork from across the globe
Posted 23-May-2018 16:44


Auckland tops list of most vulnerable cities in a zombie apocalypse
Posted 23-May-2018 12:52


ASB first bank in New Zealand to step out with Garmin Pay
Posted 23-May-2018 00:10


Umbrellar becomes Microsoft Cloud Solution Provider
Posted 22-May-2018 15:43


Three New Zealand projects shortlisted in IDC Asia Pacific Smart Cities Awards
Posted 22-May-2018 15:14


UpStarters - the New Zealand tech and innovation story
Posted 21-May-2018 09:55


Lightbox updates platform with new streaming options
Posted 17-May-2018 13:09


Norton Core router launches with high-performance, IoT security in New Zealand
Posted 16-May-2018 02:00


D-Link ANZ launches new 4G LTE Dual SIM M2M VPN Router
Posted 15-May-2018 19:30


New Panasonic LUMIX FT7 ideal for outdoor: waterproof, dustproof
Posted 15-May-2018 19:17


Ryanair Goes All-In on AWS
Posted 15-May-2018 19:14


Te Papa and EQC Minecraft Mod shakes up earthquake education
Posted 15-May-2018 19:12


Framing Facebook: It’s not about technology
Posted 14-May-2018 16:02


Vocus works with NZ Police and telcos to stop scam calls
Posted 12-May-2018 11:12


Vista Group signs Aeon Entertainment, largest cinema chain in Japan
Posted 11-May-2018 21:41



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.