Netgear C6250 Ac1600 Wifi Cable Modem Router User Manual

							Diagnostics and Troubleshooting 191
 AC1600 WiFi Cable Modem Router
Changes Are Not Saved
If the modem router does not save the changes that you make in the modem\
 router web 
management interface, do the following:
•
When entering configuration settings, always click the  Apply button before moving to 
another page or tab, or your changes are lost. 
• Click the  Refresh or  Reload button in the web browser
 . The changes occurred, but the 
old settings might be in the web browser’s cache.
Troubleshoot the WiFi Connectivity
If you are experiencing trouble connecting over WiFi to the modem router\
, try to isolate the 
problem:
• Make sure that the WiFi settings in your WiFi device and modem router ma\
tch exactly
 .
For a device that is connected over WiFi, the WiFi network name (SSID)\
 and WiFi 
security settings of the modem router and WiFi computer must match exact\
ly
 . The default 
SSID and password are on the product label (see  Product Label on page
  23).
• Does the WiFi device that you are using find your WiFi network?
If a WiFi LED stays off, the associated WiFi radio in the modem router is off. For 
information about turning on the WiFi radio, see  Control the WiFi Radios on page 155.
If you turn on the 2.4 GHz WiFi radio, the 2.4 GHz WiFi LED 
 lights green.
If you turn on the 5 GHz WiFi radio, the 5 GHz WiFi LED 
 lights green.
• If you disabled the modem router’
 s SSID broadcast, your WiFi network is hidden and 
does not display in your WiFi client’s scanning list. (By default, SSID broadcast is 
enabled.) For more information, see  Manage the Basic WiFi Settings and WiFi Security of 
the Main Network on page  36.
• Does your WiFi device support the security that you are using for your W\
iFi network 
(WEP

, WPA, or WPA2)? For information about changing the WiFi security, see Manage 
the Basic WiFi Settings and WiFi Security of the Main Network  on page
  36.
Tip: If you want to change the WiFi settings of the modem router’
 s main 
network, use a wired connection to avoid being disconnected when 
the new WiFi settings take effect.
If your WiFi device finds your network but the signal strength is weak, \
check these conditions:
• Is your modem router too far from your WiFi device or too close? Place y\
our WiFi device 
near the modem router but at least 6 feet (1.8 meters) away and see wh\
ether the signal 
strength improves.
• Are objects between the modem router and your WiFi device blocking the W\
iFi signal? 
						

							Diagnostics and Troubleshooting 
192 AC1600 WiFi Cable Modem Router 
TCP/IP Network Not Responding
Most TCP/IP terminal devices and routers provide a ping utility for sending an echo request 
packet to the designated device. The device responds with an echo reply to tell whether a 
TCP/IP network is responding to requests.
Test the LAN Path to Your Modem Router
You can ping the modem router from your computer to verify that the LAN path to your 
modem router is set up correctly.
To ping the modem router from a Windows computer:
1. From the Windows taskbar, click the Start button and select Run.
2. In the field provided, type ping followed by the IP address of the modem router, as in this 
example:
ping 192.168.0.1
3. Click the OK button.
A message such as the following one displays:
Pinging  with 32 bytes of data
If the path is working, you see this message:
Reply from < IP address >: bytes=32 time=NN ms TTL=xxx
If the path is not working, you see this message:
Request timed out
If the path is not functioning correctly, the network might not be configured correctly. Do 
the following:
•Verify that the Ethernet card driver software and TCP/IP software are both installed 
and configured on your computer or workstation.
•Verify that the IP address for your modem router and your computer are correct and 
that the addresses are on the same subnet.
Test the Path from Your Computer to a Remote Device
After you verify that the LAN path works correctly, test the path from your computer to a 
remote device:
1. From the Windows toolbar, click the Start button and select Run.
2. In the field provided, type
ping -n 10 IP address
where IP address is the IP address of a remote device such as your cable service 
provider’s DNS server. 
						

							Diagnostics and Troubleshooting 
193  AC1600 WiFi Cable Modem Router
If the path is functioning correctly, replies as described in Test the LAN Path to Your Modem 
Router on page 192 display. If you do not receive replies, do the following:
•Check to see that your computer uses the IP address of your modem router as the default 
modem router. If the IP configuration of your computer is assigned by DHCP, this 
information is not visible in your computer’s Network Control Panel. Verify that the IP 
address of the modem router is listed as the default router.
•Check to see that the network address of your computer (the portion of the IP address 
specified by the netmask) is different from the network address of the remote device.
•If the modem router cannot obtain an IP address from the cable service provider, the 
cable service provider might check for a host name, a domain name, or both. Assign the 
host name, domain name, or both. For more information, see 
View or Manually Set Up 
the IPv4 Internet Settings on page 30. 
						

							194
A
A.   Factory Default Settings and 
Specifications
This appendix includes the factory default settings and technical specifications for the modem 
router.
This appendix contains the following sections:
•Factory Default Settings
•Technical and Environmental Specifications 
						

							 Factory Default Settings and Specifications
195  AC1600 WiFi Cable Modem Router
Factory Default Settings
You can return the modem router to its factory default settings (see Return the Modem 
Router to Its Factory Default Settings on page 11 3). The following table shows the factory 
default settings.
Table 6.  Factory default settings 
FeatureDefault Settings
Router loginUser login URLhttp://www.routerlogin.net, http://www.routerlogin.com, 
or http://192.168.0.1
User name (case-sensitive)admin 
Login password (case-sensitive)password
Local area network 
(LAN)LAN IP address192.168.0.1
Subnet mask255.255.255.0
DHCP serverEnabled
DHCP range192.168.0.10 to 192.168.0.254
DHCP start IP address192.168.0.11
DHCP end IP address192.168.0.254
Reserved IP address for 
ReadySHARE192.168.0.10
UPnPEnabled
Wide area network 
(WAN) and securityPort scan and DoS protectionDisabled
Default DMZ serverDisabled
Respond to ping on Internet portDisabled
MTU size Uses the maximum MTU value for best throughput
SIP ALGEnabled
Remote management over WANDisabled
Inbound communication from the 
InternetDisabled, except for traffic on port 80 (the HTTP port) 
in response to requests from the LAN
Outbound communication to the 
InternetEnabled
Network address translationEnabled (nonconfigurable)
Stateful packet inspectionEnabled (nonconfigurable)
Sites blockedNone
Services blockedNone 
						

							 Factory Default Settings and Specifications
196 AC1600 WiFi Cable Modem Router 
Main WiFi networkWiFi communicationEnabled (2.4 GHz and 5 GHz bands)
SSID nameSee product label
SSID broadcastEnabled (2.4 GHz and 5 GHz bands)
SecurityWPA2-PSK (AES)
WiFi network key (passphrase)See product label
Country/regionUnited States, nonconfigurable
RF channel• 2.4 GHz band: Auto
• 5 GHz band: 153
Transmission speedAuto1
Operating mode• 2.4 GHz band: Up to 300 Mbps
• 5 GHz band: Up to 1.3 Gbps
Guest WiFi networkWiFi communicationDisabled
SSID name• 2.4 GHz band: NETGEAR-Guest
• 5 GHz band: NETGEAR-5G-Guest
SSID broadcastEnabled (2.4 GHz and 5 GHz bands)
SecurityNone (open network)
Allow guests to access main 
networkDisabled (2.4 GHz and 5 GHz bands)
General and 
advanced WiFi 
settingsRadio transmission power100%, nonconfigurable (2.4 GHz and 5 GHz bands)
Fragmentation length2346 (2.4 GHz and 5 GHz bands)
CTS/RTS threshold2347 (2.4 GHz and 5 GHz bands)
Preamble modeLong Preamble, nonconfigurable (2.4 GHz and 5 GHz 
bands)
Beamforming transmissionEnabled (5 GHz band only)
Beamforming receptionEnabled (5 GHz band only)
WMMEnabled (2.4 GHz and 5 GHz bands)
PMFDisabled (2.4 GHz and 5 GHz bands)
WMFEnabled (2.4 GHz and 5 GHz bands)
AT FDisabled (2.4 GHz and 5 GHz bands)
Table 6.  Factory default settings (continued)
FeatureDefault Settings 
						

							 Factory Default Settings and Specifications
197  AC1600 WiFi Cable Modem Router
Technical and Environmental Specifications
WPSWPS capabilityEnabled
Modem router’s PINEnabled; see the web management interface (path 
ADVANCED > Advanced Setup > Wireless 
Settings)
Keep Existing Wireless SettingsEnabled (2.4 GHz and 5 GHz bands)
1. Maximum WiFi signal rate derived from IEEE Standard 802.11 specifications. Actual throughput can vary. Network conditions 
and environmental factors, including volume of network traffic, building materials and construction, and network overhead, lower 
actual data throughput rate.
Table 7.  Modem router specifications 
FeatureDescription
Data and routing protocolsTCP/IP, DHCP server and client, DNS relay, NAT (many-to-one), TFTP client, 
VPN pass-through, DNS, UPnP
Power adapter• North America (input): 120V, 60 Hz, 1A input
• North America (output): 12 VDC @ 2.5A, 30W maximum output
Dimensions and weight• 7.68 by 7.79 by 2.52 in. (195 by 198 by 64 mm)
• 1.2 lb (0.54 kg)
WAN portOne coaxial cable connector
DOCSIS 3.0. backward compatible with DOCSIS 2.0, 1.1, and 1.0
Ethernet portsTwo 10/100/1000BASE-T, RJ-45 autosensing ports
USB portsOne USB 2.0 ports
WiFi• 2.4 GHz band: Up to 300 Mbps or 802.11b/g/n devices
• 5 GHz band: Up to 1.3 Gbps for 802.11a/n/ac devices
WiFi channels• 2.4 GHz band: Auto or a single channel from 1 through 11
• 5 GHz band: 36, 40, 44, 48, 149, 153, 157, 161 or 165
Maximum computers per WiFi 
networkLimited by the amount of WiFi network traffic generated by each node
Operating frequency ranges• 2.4 GHz band: 2.412–2.462 GHz
• 5 GHz band: 5.18–5.24 + 5.745–5.825 GHz
Table 6.  Factory default settings (continued)
FeatureDefault Settings 
						

							 Factory Default Settings and Specifications
198 AC1600 WiFi Cable Modem Router 
802.11 authorization and 
encryption• WPA2-PSK [AES]
• WPA-PSK [TKIP] + WPA2-PSK [AES]
• WPA/WPA2 Enterprise 
Legacy methods, available only in the Up to 54 Mbps mode:
• WEP
• WPA-PSK [TKIP] 
Operating temperature32° to 104°F (0° to 40°C)
Operating humidity90% maximum relative humidity, noncondensing
Electromagnetic emissionsFCC part 15B/C/E
Safety standardsUL60950-1
Table 7.  Modem router specifications (continued)
FeatureDescription