ARP/RARP questions

[jancrow23]

I would like to know what ip addresses I should see in this  table. Shouldn't my default gateway IP have the same mac address as my  computer or router? There are 2 different ip address/mac addresses from  different a ISP than mine. I have a cisco DPC3825

I suspect a someone is spoofing my DNS.

Any help would be much appreciated

[tobyarnett]

That really depends on your network set up. You could have quite a bit in your ARP table, but simply put you should see each of your up/up interfaces as well as neighbor/next-hop devices. Can you provide output to help clarify your question?

Toby


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[jancrow23]

I am pretty new to this so bear with me. I have the wireless feature disabled because I have 1 hard wired computer. I can see my router and computer and their ip/mac addreses.

Also when ever I click on the DHCP client table it restarts my modem.

What ever you need me to provide I can, just with a little explination.

Thanks

[jancrow23]

Bump

[tobyarnett]

Ok so I had to look up the manaul on your router just to see what you may be looking at. I am guessing that your viewing your table through a web GUI? If so can you please list which screen you are looking at? My original post was around the "show arp" command that is typically done at a console/vty access port. In your case you may get different results based on the screen your looking at. If you could do a screen shot that would be really helpful, but if not can you please list the screen your looking at.

In most cases though I would think that you would have 2 or 3 IP/MAC addresses listed. One would be your ISP with its IP and MAC (your internet gateway), one or two would be your router (one for the public interface (coaxial cable) and the other for your private interface. The last IP would be your local machine that your using to access the GUI or terminal prompt.

Let me know if any questions. If your stuck try posting a screen shot and will go from there.

-Toby

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