Error when pinging from one PC to another

Yozhz · ‎12-09-2025

I have this assignment where I need to make this work. I am new, and I've spent 5 days without understanding what I'm doing wrong and why it doesn't work. The topology must not be altered. I must use OSPF and change the addresses shown in the picture for the following:

Area 2 (Left)

Internal LAN: 192.168.100.0/24

Wireless Router WRT0 (LAN: 192.168.100.1 / WAN: 10.60.1.2)

Router R1 (Fa0/0: 10.60.1.1) → towards Area 0

Loopback R1: 10.10.10.1/30

Area 0 (Backbone)

Serial link R1-R0: 10.60.3.0/30

R1: 10.60.3.1

R0: 10.60.3.2

Area 1 (Right)

Internal LAN: 192.168.200.0/24

Wireless Router WRT1 (LAN: 192.168.200.1 / WAN: 10.60.2.2)

Router R0 (Fa0/0: 10.60.2.1)

Loopback R0: 10.10.10.2/30

I don't know what else it could be. My professor says it's the configuration, but I'm completely stuck.

Routing method used: OSPF All networks must be known and reachable via ICMP (Ping)

These are the default IPs that need to be changed

Additional Required Configurations

Interface loopback 0 - RouterID: 10.10.10.0/30

Wireless Router 0

LAN: 192.168.100.1/24

Internet (WAN): 167.78.80.5/25

Wireless Router 1

LAN: 192.168.100.1/24

Internet (WAN): 200.20.40.5/25

And I can only use the 192.168.x.x network for the LAN network specified in the file.

I am new and would like to understand better without overwhelming myself.

I can ping from right to left, but when it reaches WRT0 to enter, it doesn't pass, and viceversa

im new i this page sorry

Yozhz · ‎12-09-2025

this is the file

DRC · ‎12-09-2025

When you say ping from right to left can you provide your source ping IP address and destination IP address? How did you realize it doesn't pass? Did a traceroute inform you. Have ran the command "show ip route" t on WRTO?

for WRT0 there is a 0/1 and 0/2 interface what is configured on each interface, as you have mentioned a single network of 192.168.100.0/24?

Yozhz · ‎12-09-2025

Thank you for replying and taking the time to help me. I really appreciate it.

Here is the information requested about the ping tests, the source/destination IPs, and the configuration of the WRT300N routers in Packet Tracer.

IP addresses used in the ping tests

Left side (Area 2 – behind WRT0):

Laptop0 → 192.168.100.100 /24, gateway 192.168.100.1

Laptop1 → 192.168.100.101 /24, gateway 192.168.100.1

Right side (Area 1 – behind WRT1):

PC1 → 192.168.200.100 /24, gateway 192.168.200.1

Laptop2 → 192.168.200.102 /24, gateway 192.168.200.1

PC0 → 192.168.200.101 /24, gateway 192.168.200.1

Ping behavior

From the PCs behind the WRT routers (LAN networks 192.168.100.x and 192.168.200.x),
I can ping the Cisco routers R1 and R0 with no issues.

However, when traffic must return through the WRT back toward the LAN, the packets are blocked.

Specifically:

From Laptop0 (192.168.100.100) I can ping:

10.60.1.1 (R1 Fa0/0)

10.60.2.1 (R0 Fa0/0)

10.60.3.x (serial network)

These pings work correctly, and OSPF routing between R1 and R0 is also working.

What does NOT work:

I cannot ping any host in the 192.168.200.0/24 network
(right side LAN behind WRT1), even though R0 and R1 can reach each other perfectly.

In the Packet Tracer simulation, the ICMP packet reaches WRT1,
but the router does NOT forward it into the LAN.

Cristian Matei · ‎12-09-2025

Hi,

Did you check on "show ip route ospf", across all your routers, if you have all prefixes learned via OSPF and installed in RIB? If not, check if all OSPF adjacencies are formed, via "show ip ospf neighbor" and see if interfaces are OSPF enabled and in which area via "show ip ospf interface brief".

Based on the presented topology, which PING works (give an example with source/destination) and which ping does not work (give an example with source/destination).

Thanks,

Cristian.

Yozhz · ‎12-09-2025

Hi everyone, thank you for helping.
Here are the tests I ran and the results.

Pings that DO work (router to router)

From R1 → R0

ping 10.60.3.2 (R0 Serial)

ping 10.60.2.1 (R0 Fa0/0)

ping 10.10.10.2 (R0 Loopback)

From R0 → R1

ping 10.60.3.1 (R1 Serial)

ping 10.60.1.1 (R1 Fa0/0)

ping 10.10.10.1 (R1 Loopback)

So routing between the Cisco routers works perfectly.

Also, PCs on both sides can reach their local router, and they can also reach the opposite router (R0 or R1).
The problem only happens when the traffic needs to cross the WRT300N devices.

In the simulation (realtime or step-by-step), the ICMP packet stops at the WRT devices and never passes through.

Pings that do NOT work (LAN to LAN)

Example:

Left Laptop (192.168.100.102) → Right PC (192.168.200.100) FAIL

Right PC (192.168.200.110) → Left Laptop (192.168.100.102) FAIL

Any ping from the left LAN to the right LAN or vice-versa fails.
None of these packets pass through the WRT300N routers.

OSPF Routing Tables

R1 — show ip route ospf

10.0.0.0/8 is variably subnetted, 5 subnets

O 10.10.10.2 [110/65] via 10.60.3.2, Serial2/0

O IA 10.60.2.0 [110/65] via 10.60.3.2, Serial2/0

R0 — show ip route

10.0.0.0/8 is variably subnetted, 5 subnets

C 10.10.10.0/30 is directly connected, Loopback0

O 10.10.10.1/32 [110/65] via 10.60.3.1, Serial2/0

O IA 10.60.1.0/24 [110/65] via 10.60.3.1, Serial2/0

C 10.60.2.0/24 is directly connected, Fa0/0

C 10.60.3.0/30 is directly connected, Serial2/0

This shows that OSPF routes are being learned correctly and installed in the RIB.

I am still learning Packet Tracer and network configuration, so please let me know if you need additional outputs or details from the project.

Thanks again for your patience.

DRC · ‎12-10-2025

Is there a default route configured on R1 and R0? The show ip route for R1 and R0 don't show any network information about the 192.168.X.0/24 networks on either left or right side.

Do you have ip ospf area 1 on interface 0/0 on WRT right side and the same for area 2 with "ip ospf area 2" on WRT300?

Can you confirm how you have WRT300 interfaces 0/1 and 0/2 for the 192.168.100.0/24 network?

Yozhz · ‎12-10-2025

Thank you for the follow-up questions. I will clarify each point.

Default route on R1 and R0

No, there is no default route configured on either R1 or R0.

Here are the outputs:

R0: show ip route

(only 10.x.x.x networks appear, no 192.168.x.x networks)

R0#show ip route

Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP

i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area

* - candidate default, U - per-user static route, o - ODR

P - periodic downloaded static route

Gateway of last resort is not set

10.0.0.0/8 is variably subnetted, 5 subnets, 3 masks

C 10.10.10.0/30 is directly connected, Loopback0

O 10.10.10.1/32 [110/65] via 10.60.3.1, 00:10:20, Serial2/0

O IA 10.60.1.0/24 [110/65] via 10.60.3.1, 00:10:20, Serial2/0

C 10.60.2.0/24 is directly connected, FastEthernet0/0

C 10.60.3.0/30 is directly connected, Serial2/0

R0#

R1: show ip route

R1#

R1#show ip route

Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP

i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area

* - candidate default, U - per-user static route, o - ODR

P - periodic downloaded static route

Gateway of last resort is not set

10.0.0.0/8 is variably subnetted, 5 subnets, 3 masks

C 10.10.10.0/30 is directly connected, Loopback0

O 10.10.10.2/32 [110/65] via 10.60.3.2, 00:11:45, Serial2/0

C 10.60.1.0/24 is directly connected, FastEthernet0/0

O IA 10.60.2.0/24 [110/65] via 10.60.3.2, 00:11:45, Serial2/0

C 10.60.3.0/30 is directly connected, Serial2/0

R1#

Both routers only run OSPF for the backbone networks (10.60.x.x and 10.10.10.x).

The 192.168.100.0/24 and 192.168.200.0/24 LANs are behind the WRT300N routers, which are NOT Cisco routers and DO NOT support CLI or OSPF, so they cannot participate in the OSPF process.

configuration on the WRT routers

The WRT300N devices in Packet Tracer have:

No CLI

No support for routing protocols (OSPF, RIP, etc.)

WAN interface with static IP

LAN interface with DHCP and NAT

WRT300N interfaces for the LAN networks

Images of both GUI screens are attached showing the exact configuration.

If you need additional outputs (show ip ospf interface, show run, etc.), let me know and I will provide them.

DRC · ‎12-10-2025

Thanks for the information. Based on this printout your LAN traffic should not be getting forwarded past the Router1 or Router0.

You sent screenshots but mentioned a NAT and DHCP, can you share NAT settings. Especially, is you have a /24 on the 10.60.X.X networks but only two links are you translating the 192.168.X.X networks?

Yozhz · ‎12-10-2025

My instructor told me twice to “review my configuration,” but he never said the issue was the WRT300N.

At the same time, I have been researching and found that the WRT300N in Packet Tracer uses automatic NAT and has an inbound filtering behavior that might block traffic coming from the WAN back into the LAN.

I am not claiming this is the root cause, I am only mentioning it as a possible factor, since other Packet Tracer users have reported similar limitations when trying to send traffic from one LAN to another through WRT300N devices.

Still, I am open to reviewing my OSPF configuration or static routes, since my instructor suggested the issue is most likely on my configuration side.

Concerning your question about whether I am “translating only two links” rather than the entire /24 networks:

– The 192.168.100.0/24 and 192.168.200.0/24 networks are connected to the LAN ports of the WRT.
– The 10.60.X.X networks are the WAN side, connected toward the Cisco routers.

The WRT only allows configuring WAN IP, LAN IP, DHCP, and gateway. There is no NAT configuration section available, so I cannot confirm specific translation rules beyond what the GUI shows.

If you need screenshots of the WRT GUI tabs to see exactly what Packet Tracer provides, I can attach them

Joseph W. Doherty · ‎12-10-2025

Forums earlier reported issues with file downloads, which I don't see now. However, I'm unable to download your PT file(s). Could you try making a new reply with a current copy of your PT file?

Yozhz · ‎12-10-2025

https://mega.nz/file/NREBCSpR#7PdnK-4Lx5PaHcFHsKi3W7_gA0VsUfZ-0LRW9jZg06o
Yes, I realized that it didn’t let me upload the .pkt file because that format isn’t supported, so I thought about putting it inside a .zip. I’ll try again, and if it still doesn’t work, I can upload it to a file-sharing service—although I’m not sure if the website will allow that.

Here is another link via Google Drive, because the forum does not allow me to upload the .pkt file directly.
I also tried uploading it as a .zip file, but it still didn’t work.
I’m not sure why, since the file is clean and my intention is not to cause any inconvenience.

https://drive.google.com/file/d/14bOzIPiHiPGRteoJjNfUK3lx4511zHja/view?usp=sharing

DRC · ‎12-10-2025

Looks like the the latest link works, but my computer blocks the site. Thank you.

Yozhz · ‎12-10-2025

Hi again,

you mentioned issues downloading my original file, so I’m providing an alternative link via Google Drive.
This is the most recent and complete version of my Packet Tracer project:

Google Drive (.pkt file):
https://drive.google.com/file/d/14bOzIPiHiPGRteoJjNfUK3lx4511zHja/view?usp=sharing

Please let me know if this link works for you.

Joseph W. Doherty · ‎12-10-2025

Got it, but I see it's version 9, so I've updated my version and can open your lab.

I'll get back to you after I've examined the lab. Possibly sometime tomorrow.