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smokeydog

@e-xpedient.com

[HSI] Modem ip address?

I just started Charter internet and have a charter supplied Motorola SB85101 cable modem connected to my Cisco router, and they are working fine. The router is at 192.168.1.1 with subnet mask 255.255.255.0. I would like to view the modem's status pages & logs, but it doesn't respond to 192.168.100.1. Does anyone know what the address might be?
The router won't let me change the subnet mask to anything other than 255.255.255.xxx.



88615298
Premium
join:2004-07-28
West Tenness

said by smokeydog :

I just started Charter internet and have a charter supplied Motorola SB85101 cable modem connected to my Cisco router, and they are working fine. The router is at 192.168.1.1 with subnet mask 255.255.255.0. I would like to view the modem's status pages & logs, but it doesn't respond to 192.168.100.1. Does anyone know what the address might be?
The router won't let me change the subnet mask to anything other than 255.255.255.xxx.

SB85101? Are you sure that's right? I've heard of SB5101


DrDrew
That others may surf
Premium
join:2009-01-28
SoCal
kudos:15
reply to smokeydog

What model Cisco router?



smokeydog

@e-xpedient.com

The modem is an SB5101 not 85101 as in my post and the router is a Cisco/Linksys E1200.


bdnhsv

join:2012-01-20
Huntsville, AL

try pinging 192.168.100.1 and see if it responds.



88615298
Premium
join:2004-07-28
West Tenness
reply to smokeydog

Is it the SB5101 or SB5101E. Also is the computer you're using wired or wireless when trying to view the modem status page.



smokeydog

@e-xpedient.com

192.168.100.1 doesn't respond to pings and I've pinged all between 192.168.1.2 and 255 without finding the modem.

The computer(s) are wireless connected to the router.



Dogg
Premium
join:2003-06-11
Belleville, IL
reply to smokeydog

You can't ping the modem from behind the router/switch.
--
Google is your Friend



DrDrew
That others may surf
Premium
join:2009-01-28
SoCal
kudos:15
reply to smokeydog

Connect the modem direct to your computer, without your router and try »192.168.100.1



CptGemini
Inside your computer
Premium
join:2004-11-29
Corpus Christi, TX
kudos:6
reply to smokeydog

Change the 3rd set of numbers on your router to something like 160 for example. Your modems IP address is most likely that of what your routers default IP is.



The_ANoN

@charter.com

I could be wrong, but directly connect the modem to your PC and try 192.168.0.1. Its gotta be either that or 192.168.1.100


Nspradley
Premium
join:2011-03-17
Northport, AL

The modem will be 192.168.100.1



mmainprize

join:2001-12-06
Houghton Lake, MI
Reviews:
·Charter
reply to smokeydog

A few things to look at as i have seen this before also.

First if you spoof the Router MAC and put the MAC of the PC into the router then you might see problem like this.

Also if the PC is using a fixed IP it may not find the modem, but from a PC using DHCP it will.



DrDrew
That others may surf
Premium
join:2009-01-28
SoCal
kudos:15

1 edit
reply to Dogg

said by Dogg:

You can't ping the modem from behind the router/switch.

Since when? Most home routers allow it, since they don't block RFC1918 addresses from crossing the WAN link:

$ ping 192.168.100.1
PING 192.168.100.1 (192.168.100.1): 56 data bytes
64 bytes from 192.168.100.1: icmp_seq=0 ttl=63 time=2.903 ms
64 bytes from 192.168.100.1: icmp_seq=1 ttl=63 time=2.480 ms
64 bytes from 192.168.100.1: icmp_seq=2 ttl=63 time=2.472 ms
64 bytes from 192.168.100.1: icmp_seq=3 ttl=63 time=2.482 ms
64 bytes from 192.168.100.1: icmp_seq=4 ttl=63 time=2.510 ms
^C
--- 192.168.100.1 ping statistics ---
5 packets transmitted, 5 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 2.472/2.569/2.903/0.167 ms

$ traceroute 192.168.100.1
traceroute to 192.168.100.1 (192.168.100.1), 64 hops max, 52 byte packets
1 home-router (192.168.1.1) 0.975 ms 0.676 ms 0.604 ms
2 192.168.100.1 (192.168.100.1) 2.476 ms 2.496 ms 2.416 ms
$





--
If it's important, back it up... twice. Even 99.999% availability isn't enough sometimes.


smokeydog

@charter.com

Thanks to all for your advice. At motorola I found that the modem's ip is in fact 192.168.100.1, but my router at 192.168.1.1 and subnet 255.255.255.0 won't allow a connection to anything but a 192.168.1.x address. The router won't let me change the subnet to anything other than 255.255.255.x.

I can probably get around this by setting the router ip to 192.168.100.2, but does anyone know if this will mess anything up?

A direct ethernet from modem to PC will probably work, but I can't use that on a regular basis.


bdnhsv

join:2012-01-20
Huntsville, AL
reply to DrDrew

What's the IP address currently in use on your computer? 192.168.1.X ?



smokeydog

@charter.com

I found the solution manually adding a route using route add at the command prompt.
"route add 192.168.100.0 mask 255.255.255.0 192.168.1.109"
where 192.168.1.109 is my pc acting as gateway.