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TOPIC: IP address on router serial 0/0 overlaps Ethernet 0/0

IP address on router serial 0/0 overlaps Ethernet 0/0 7 years 3 months ago #30616

  • pruss09
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I'm new to Networking and currently in the CCNA 1 Class.
I'm creating a network in Packet tracer and having an issue assigning an IP Address to the Router Serial 0/0. I receive an error that it "overlaps ethernet 0/0". I have subnetted a network address to use 8 subnetworks. I can ping the routers from all host and servers on the different subnets. I am now trying to assign the IP addresses in the Routers.
I'm not sure why I receive the error "overlaps Ethernet 0/0" when I try to assign the IP to serial 0/0.
Ethernet 0/0 on the router is set to 100.106.160.1 and the router Serial 0/0 I'm trying to set to 100.106.162.2. Could someone explain why I would receive this error when the addresses are different subnets?

Thanks, your help would be greatly appreicated!!! :D
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Re: IP address on router serial 0/0 overlaps Ethernet 0/0 7 years 3 months ago #30618

  • ZiPPy
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You are dealing with two different interfaces(serial and ethernet) that are on two different segments. You cannot assign an IP of the same subnet to two interfaces on separate segments.

Using the OSI layer model, you have a layer 3(serial) interface and a layer 2(ethernet) interface. You cannot have these two segments on the same subnet.


Cheers mate,

ZiPPy
ZiPPy
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Overlap Serial with Ethernet 7 years 3 months ago #30619

  • pruss09
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Hello Zippy,

Thank you so much for your help. Although I'm still a little confused.

I have my 0th network assigned 100.106.160.0/19 (this was provided)

Host IP 100.106.160.2
Default Gateway- 100.106.160.1

FIRST Router Ethernet address -100.106.160.1

I subnetted the provided address and wanted to assign the FIRST router serial 0/0 port 100.106.162.2/23 this IP is on the 1st subnet between the two routers , I think this is where I'm confused?)
I have 8 subnets in my topology with a maximum host number of 280, so I made the new mask /23 (borrowed 4 host bits to give me a maximum of 16 subnets and 510 host per subnet

I just wanted to know what else needs to be assigned in the router other than the Ethernet 100.106.160.1 being the default gateway for Host IP 100.106.160.2. I wish I could send you a screen shot of my Topology from Packet Tracer.

So, I have a server connected to a router (0th subnet) I have a router connected to a router using DCE (1st subnet) this is just the start but I'm stuck here.

Thanks again for your help!!


You are dealing with two different interfaces(serial and ethernet) that are on two different segments. You cannot assign an IP of the same subnet to two interfaces on separate segments.

Using the OSI layer model, you have a layer 3(serial) interface and a layer 2(ethernet) interface. You cannot have these two segments on the same subnet.


Cheers mate,

ZiPPy
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Re: IP address on router serial 0/0 overlaps Ethernet 0/0 7 years 3 months ago #30620

  • ZiPPy
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Where are you getting 280 hosts from? That is an odd number to have for a maximum number of hosts. Because that falls in between 254 hosts or 510hosts. And what is your configuration on the 2nd router?

Send me screenshot of your network in Packet Tracer. Simply take a screenshot, and cut the network topology out and throw it in paint or something. Save the image as a .jpeg and then use imageshack (link: imageshack.us/) to upload it to the forums.


Cheers,

ZiPPy
ZiPPy
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Re: IP address on router serial 0/0 overlaps Ethernet 0/0 7 years 3 months ago #30621

  • S0lo
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I'm not sure why I receive the error "overlaps Ethernet 0/0" when I try to assign the IP to serial 0/0.
Ethernet 0/0 on the router is set to 100.106.160.1 and the router Serial 0/0 I'm trying to set to 100.106.162.2. Could someone explain why I would receive this error when the addresses are different subnets?

Strange, it shouldn't overlap with a mask of /23. Make sure you set the correct mask (255.255.254.0) on both interfaces like this:

[code:1]Router(config)# interface fa0/0
Router(config-if)# ip address 100.106.160.1 255.255.254.0
Router(config-if)# interface s0/0
Router(config-if)# ip address 100.106.162.2 255.255.254.0[/code:1]

If it doesn't solve it, a screen shot as ZiPPy suggested could help.
Studying CCNP...

Ammar Muqaddas
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Re: IP address on router serial 0/0 overlaps Ethernet 0/0 7 years 3 months ago #30624

  • pruss09
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The 280 host is the required number of host for the project.. I subnetting to have a max number of 510 (9 host bits)

I will send you a screen shot. Just didn't know where to upload it..

Thanks!

Where are you getting 280 hosts from? That is an odd number to have for a maximum number of hosts. Because that falls in between 254 hosts or 510hosts. And what is your configuration on the 2nd router?

Send me screenshot of your network in Packet Tracer. Simply take a screenshot, and cut the network topology out and throw it in paint or something. Save the image as a .jpeg and then use imageshack (link: imageshack.us/) to upload it to the forums.


Cheers,

ZiPPy
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