02-23-2024 09:08 AM - edited 02-23-2024 10:06 AM
I'm configuring OSPF authentication in a lab on Packet Tracer. I have two PCs, two Catalyst 2960 switches, and three 4331 routers. I have configured PC-A and R1 and I tried pinging them, but I noticed something while I was pinging them.
Here is my setup so far:
When I try to ping both port IP addresses on R1 from PC-A, I don't get a response and it times out. However, when I switch the cables and connect from Fa0/5 to G0/0/1 on R1 and G0/0/0 on R1 to G0/0/0 on R2, the ping works. Why does it work when I put the cables in different ports?
02-23-2024 09:28 AM
attach your PT file but it must be in a zip format
Regards, ML
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02-23-2024 09:31 AM
Oh okay, my apologies.
02-23-2024 09:47 AM - edited 02-23-2024 09:53 AM
PT odes not show Port IDs; u can change that in PT options;
for a router to communicate to directly connected router (or any device) and exchange routes with L3 device (via same protocol like ospf) that link must be on the same network, aka subnet; I.e. R1 to R2 is on 10.1.1.x/30; R2 to R3 is on 10.1.2.x/30 while Router LAN to PCs is on 192.168.1.x /24 subnet
Often we can make simple mistake by connecting cables in wrong ports.
Regards, ML
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02-23-2024 10:26 AM - edited 02-23-2024 10:28 AM
Thank you for the explanation. I apologize if this sounds dumb, but I'm still not quite understanding. I have switched the cables to their proper ports, and I now have PC-A on 192.168.1.3/24 (Fa0), R1 on 10.1.1.1/30 (G0/0/0) and 192.168.1.1/24 (G0/0/1) and I am able to ping both R1 ports from PC-A now.
How is PC-A able to ping G0/0/0 on R1 if the two devices are on two different networks?
02-23-2024 11:16 AM
no, it should not be able to reach each others; notice that in file u shared PC A is on left connecting Router 0 not R1, some links are down; missing IPs.
In order for PCA to reach R1 ((on right) and PC-C via R0 and R2, all routers must exchange routes; have IPs and interfaces in UP UP state.
i will attach my solution later ...
Regards, ML
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02-23-2024 02:53 PM
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