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Packet Tracer: WRT300N ICMP issue?

Stork66722
Level 1
Level 1

Hi All! 

I have created a simple network:

Screen Shot 2022-11-21 at 8.57.40 PM.png

 

I can ping from the laptop to the PC and 2811 router, but I cannot ping from the PC to the laptop or wireless router. 

I have seen in several other posts that mention a limitation or bug in Packet tracer that does not allow for ICMP (ping) messages to travel to across/through the wireless router(WRT300N) to the wirelessly connected laptop. 

Is this true? When I review a simulation, the layer 3 message states:

1. The receiving port has an inbound traffic access-list with an ID of 100. The device checks the packet against the access-list.

2. The packet matches the criteria of the following statement: deny icmp any any. The packet is denied and dropped

Accessing the Wireless Router GUI does not provide an option to allow access to be enabled for ip addresses outside of the LAN i.e. PC ip 192.168.1.3. 

Banging my head against the wall here and can only assume it is a limitation. Any advice would help....

 

4 Accepted Solutions

Accepted Solutions

Martin L
VIP
VIP

Yes, I think we had same issue mentioned here before; Ping works only if started from inside LAN to outside but not outside to inside.  Same thing in real Linksys/Cisco Wireless Router GUI but you could enable DMZ and remote management in real world. So, I guess you can call that a limitation of PT.

Regards, ML
**Please Rate All Helpful Responses **

View solution in original post

Hello,

this has come up quite a lot in the past. I can confirm what the other users say: it is a limitation of the WRT300N in Packet Tracer. ICMP/Ping from the inside to the outside works, ICMP/Ping from the outside to the WRT300N itself, and anything on the inside of the WRT300N, does not work.

View solution in original post

NetworkDave
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@Stork66722,

I modified your configuration to provide the following requirements:
- Two separate networks
- One of the two networks provides wireless capabilities and DHCP services using a WRT300N.
- Hosts can communicate with each other locally and with other hosts on remote networks.
Laptop0 on one network can successful ping PC0 on the other network and vice versa.

The IP addressing scheme was changed. If your project requires a specific one, then you can make changes as needed.

The 2811 router will allow these two network to connect to your project's other networks.

Attached: Modified file

HTH
----------------------------------------------------------------------------------------------------
Remember to mark helpful posts and mark the correct answer as a solution; It helps other users with similar questions.

View solution in original post

NetworkDave
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@Stork66722,

You are correct. Since the WRT300N internet connection is not being used, its settings are blank intentionally. I am using PTv8.2.

When I reopened the file to recheck the results, here's what I found:

Open file CC - Packet Tracer WRT300N ICMP issue_HR - Pings Successful.pkt
Ping from Laptop0 (192.168.10.100) to PC0 (192.168.30.10) = Fail
Ping from PC0 (192.168.30.10) to Laptop0 (192.168.10.100) = Fail

But if...

Open file CC - Packet Tracer WRT300N ICMP issue_HR - Pings Successful.pkt
Ping from PC0 (192.168.30.10) to Laptop0 (192.168.10.100) = Successful
Ping from Laptop0 (192.168.10.100) to PC0 (192.168.30.10) = Successful

So when you first open the file and ping from PC0 to Laptop0, everything is good.

Give it a try and update us accordingly.

[Note: As packet tracer only has one other wireless router (Home) and it functions the same as the WRT300N ... another option would be to use an access point (for wireless connectivity) and the router or a server (for DHCP) services.

HTH
----------------------------------------------------------------------------------------------------
Remember to mark helpful posts and mark the correct answer as a solution; It helps other users with similar questions.

View solution in original post

14 Replies 14

Martin L
VIP
VIP

Yes, I think we had same issue mentioned here before; Ping works only if started from inside LAN to outside but not outside to inside.  Same thing in real Linksys/Cisco Wireless Router GUI but you could enable DMZ and remote management in real world. So, I guess you can call that a limitation of PT.

Regards, ML
**Please Rate All Helpful Responses **

NetworkDave
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@Stork66722,

Which course and packet tracer is this?

Please provide the zipped packet tracer file and instructions.

For academic integrity purposes I cannot provide that information. I can tell, you that it is for a wireless networking course and I created a basic network, which is part of a larger network that includes ip phones, server, gateway router and work stations using vlans. I just wanted to confirm the WRT300N limitation within packet tracer... 

Hello,

this has come up quite a lot in the past. I can confirm what the other users say: it is a limitation of the WRT300N in Packet Tracer. ICMP/Ping from the inside to the outside works, ICMP/Ping from the outside to the WRT300N itself, and anything on the inside of the WRT300N, does not work.

NetworkDave
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@Stork66722,

Two top members ( @Georg Pauwen / @Martin L ) of the community have confirmed the limitations of the WRT300N.

Did you create the lab randomly or using instructions from your course? In your topology, what is the purpose of the WRT300N? Is it being used mainly to provide wireless connectivity and DHCP servives only? What is the criteria being used?

Either way, with or without the WRT300N, there are several ways to accomplish what you want this local LAN segment to do.

Let us know if you want more assistance.

HTH
----------------------------------------------------------------------------------------------------
Remember to mark helpful posts and mark the correct answer as a solution; It helps other users with similar questions.

Hi @NetworkDave!

I created the network shown above based on a project. Connecting 3 networks via gateway routers. You are correct about the wireless router in that it is a segmented section of one larger network. Providing a handful of deceives the ability to connect outside of its DHCP network. The main goal is to have the devices (laptops connected to the wireless router) communicate with other devices outside of its WLAN. I am able to accomplish this and ping the gateway router through the wireless router via a switch. In theory I can ping through this gateway router to other LAN’s with gateway routers. The wireless router is required and am not sure if there is another wireless router within Packet Tracer that will forward these packets. I tried toying around with a 2811 router and adding a HWIC-AP-G-B card to set up a radio access point but with limited time and testing I decided to move away from that. Either way I appreciate the help!

NetworkDave
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@Stork66722,

I modified your configuration to provide the following requirements:
- Two separate networks
- One of the two networks provides wireless capabilities and DHCP services using a WRT300N.
- Hosts can communicate with each other locally and with other hosts on remote networks.
Laptop0 on one network can successful ping PC0 on the other network and vice versa.

The IP addressing scheme was changed. If your project requires a specific one, then you can make changes as needed.

The 2811 router will allow these two network to connect to your project's other networks.

Attached: Modified file

HTH
----------------------------------------------------------------------------------------------------
Remember to mark helpful posts and mark the correct answer as a solution; It helps other users with similar questions.

Hi @NetworkDave

Just took a look at this and I am not able to ping from the Laptop or the PC. I can ping the GW router. 

Not sure if this this right, but the file your provided shows that the Wireless router has no static IP address to the Internet port. Not sure if that was intentional, as I thought that might be the trick. 

The set up is basically identically to what I have, 2 vlans using the 2811 router as a 'communication' device. 

When I try to ping from the laptop I get the "Reply from 192.168.10.1: Destination host unreachable."

 

Screen Shot 2022-11-26 at 2.28.55 PM.pngScreen Shot 2022-11-26 at 2.28.17 PM.png

 

Screen Shot 2022-11-26 at 3.25.59 PM.png

 

I am using Packet Tracer 8.2, assuming you are too....not sure why I am not seeing this as a success....

NetworkDave
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@Stork66722,

You are correct. Since the WRT300N internet connection is not being used, its settings are blank intentionally. I am using PTv8.2.

When I reopened the file to recheck the results, here's what I found:

Open file CC - Packet Tracer WRT300N ICMP issue_HR - Pings Successful.pkt
Ping from Laptop0 (192.168.10.100) to PC0 (192.168.30.10) = Fail
Ping from PC0 (192.168.30.10) to Laptop0 (192.168.10.100) = Fail

But if...

Open file CC - Packet Tracer WRT300N ICMP issue_HR - Pings Successful.pkt
Ping from PC0 (192.168.30.10) to Laptop0 (192.168.10.100) = Successful
Ping from Laptop0 (192.168.10.100) to PC0 (192.168.30.10) = Successful

So when you first open the file and ping from PC0 to Laptop0, everything is good.

Give it a try and update us accordingly.

[Note: As packet tracer only has one other wireless router (Home) and it functions the same as the WRT300N ... another option would be to use an access point (for wireless connectivity) and the router or a server (for DHCP) services.

HTH
----------------------------------------------------------------------------------------------------
Remember to mark helpful posts and mark the correct answer as a solution; It helps other users with similar questions.

Hi @NetworkDave,

Absolute clutch!!! 2 things to note:

  1. Pinging from the PC0 to the Laptop worked
  2. I also noticed that you used an ethernet port vs. the Internet port. I think that is the trick.... 

I added it to my topology and all of my devices can now ping each other !

Thank you again!! @NetworkDave 

hi @Stork66722 ,

the first point worked for me too but can you explain the second point? what is meant by using an ethernet port vs the internet port?

Hi @2020ucs0095,

There are 5 ports on the WRT300N. 1 Internet port and 4 Ethernet ports. When I initially set this up, I was connecting my switch to the internet port. This was not correct and would typically be connected to your ISP (in the real world). By connecting to any one of the Ethernet ports, it resolved my issue. Hopefully that makes sense. 

Thanks for the explanation @Stork66722 , it worked and it makes sense too. Just one more thing, even after connecting to the ethernet port pinging from laptop to pc0 doesn't work if we do it first. Is there a reason for this too or is it a bug?

NetworkDave
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@Stork66722,

Glad everything is working. Thanks for the updates, helpful votes, and markings as a solution.

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