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Windows 7: Swapped Modems, static WAN IP, Router couldn't connect

21 Nov 2017   #1
videobruce

Win7 x64 & XP
 
 
Swapped Modems, static WAN IP, Router couldn't connect

Win7
Spectrum ISP
Zoom 5341J Modem
TP-Link WDR-3600 Router running dd-wrt firmware

No Firewall in Router or in O/S
Static IP addresses for all my devices except for a ATA (Obi202)
Nothing special or fancy in the LAN.
All wired except for a Laptop.

Quote:
Microsoft Windows [Version 6.1.7601]
Windows IP Configuration
Host Name . . . . . . . . . . . . : VB1
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
Ethernet adapter Spectrum:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
Physical Address. . . . . . . . . : 40-8D-5C-87-04-31
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::8e3:ffa1:7e20:22de%11(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.2(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : fe80::16cc:20ff:feb5:3370%11
192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 239111516
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1E-CE-3D-EC-40-8D-5C-87-04-31
DNS Servers . . . . . . . . . . . : 192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Enabled
Long story short, I swapped identical Modems that gave a static WAN IP address (yes it was static!) Both had a RF connection, new one showed connected. I moved the Router cable to the new modem with no reboot of the Router.

No connection to the Internet. I rebooted the Router, still nothing. I then noted there was IP assigned. I did a DHCP release and renew twice. Still nothing.

I then reset the Router (which I didn't want to do), still nothing. No WAN IP assigned still.
I changed the LAN start IP adress from 100 to 2 since I use static IP address and after a minute the Router finally received a WAN IP address.

Questions;
1. Going from one identical Modem to another that passes an IDENTICAL IP address to the Router, is it still necessary to reboot the Router?
2. Even after rebooting, why wasn't there connectivity between the Modem & Router, even thou the Modem 'Link' LED showed connected and with activity?
3. After the Router reset, is spite of the LAN starting address at 100 which was outside of the static IP's of my devices, why didn't the Router get the WAN address from the Modem??


My System SpecsSystem Spec
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 Swapped Modems, static WAN IP, Router couldn't connect




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