quick question please

[timezone12]

I have my cable modem ip address as 192.168.100.1 and my router ip as 192.168.0.1, dose this in anyway degrade the performance of either device or speed? it has been working ok for some time by my friend who is going through mcse classes says its a bad idea and i'm loosing speed is this true thanks

 

[CaptainSTX]

It should not have any impact if your modem is just a modem and isn't assigning DHCP.

The only possible downside to your setup is that you probably can't connect from your LAN to your modem to check settings. If your modem and router were in the same subnet it would make connecting to your modem easier. Even then you might have change a setting to allow a connection from your LAN.

I assume now you have to connect a computer directly to your modem if you want to check settings.

 

[timezone12]

Nope I can just type the modem ip and I can see the modem with no problem thanks

Sent from my SPH-L900 using Tapatalk

 

[stevech]

I have my cable modem ip address as 192.168.100.1 and my router ip as 192.168.0.1, dose this in anyway degrade the performance of either device or speed? it has been working ok for some time by my friend who is going through mcse classes says its a bad idea and i'm loosing speed is this true thanks

All Motorola and Arris cable modems I've seen use 192.168.100.1 for the admin web interface. The cable modem is a layer 2 device, meaining it passes all data packets irrespective of protocol and IP address of IP packets. The 100.1 address is just for admin - not used in traffic passing. The 100.1 address is fixed; cannot be altered by customer. Your friend is incorrect.

So your choice of LAN IP addresses is an independent issue, and 192.168.x.x is fine, but avoid using 192.168.100.x for simplicity.

 

[Cloud200]

Your friend is talking about the issue of double NATing.

The easiest way to see if this is true is to look at the WAN ip address of your router.
If this address is a 192.168.100.x address, then yes; you are double NATing.

TBH though, if you can set the router to static IP address and then add it as the DMZ on the modem you ought to be fine. If you want to do it "by the book" just call up your service provider and tell them you want to put your modem into Bridge mode.

 

[jlake]

Your friend is talking about the issue of double NATing.

The easiest way to see if this is true is to look at the WAN ip address of your router.
If this address is a 192.168.100.x address, then yes; you are double NATing.

TBH though, if you can set the router to static IP address and then add it as the DMZ on the modem you ought to be fine. If you want to do it "by the book" just call up your service provider and tell them you want to put your modem into Bridge mode.

He's not double natting. The modem is bridged.

But even if his modem/connection wasn't in bridge mode, the extra NAT slowdown would typically be minimal/unnoticeable for ISP speeds less than 100 Mbps. Unless the router/firmware was a POS.

I run a client behind a triple NAT sometimes, and the latency slowdown due to the extra NATs is only around 0.5 ms to a maximum of 1 ms.

More than likely his friend is talking about gigabit speeds double natted.