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Losing Default Gateway

I just got my internet service back and since i did im having a connectivity problem. The internet will work fine for x amount of time then i will lose connection, my modem will lose all lights but the power and when i have static ip set it will erase my default gateway completely but leave the ip and subnet mask unchanged.

ive tried /release and renew and it didnt help the issue. i went and got a new modem and ethernet cable and it worked fine for about 2 hours and it started happening again. Starting to get frustrated please help!
3 answers Last reply Best Answer
More about losing default gateway
  1. Windows IP Configuration

    Host Name . . . . . . . . . . . . : Grizz-PC
    Primary Dns Suffix . . . . . . . :
    Node Type . . . . . . . . . . . . : Hybrid
    IP Routing Enabled. . . . . . . . : No
    WINS Proxy Enabled. . . . . . . . : No
    DNS Suffix Search List. . . . . . : hsd1.il.comcast.net.

    Ethernet adapter Local Area Connection:

    Connection-specific DNS Suffix . : hsd1.il.comcast.net.
    Description . . . . . . . . . . . : Atheros AR8121/AR8113/AR8114 PCI-E Ethern
    et Controller
    Physical Address. . . . . . . . . : 20-CF-30-AB-54-7A
    DHCP Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes
    IPv6 Address. . . . . . . . . . . : 2001:558:6033:10e:6968:bc6e:c080:447f(Pre
    ferred)
    Lease Obtained. . . . . . . . . . : Monday, July 08, 2013 9:25:22 PM
    Lease Expires . . . . . . . . . . : Friday, July 12, 2013 5:20:01 PM
    Link-local IPv6 Address . . . . . : fe80::a8e3:22f0:ccbd:fb62%11(Preferred)
    IPv4 Address. . . . . . . . . . . : 98.228.135.60(Preferred)
    Subnet Mask . . . . . . . . . . . : 255.255.248.0
    Lease Obtained. . . . . . . . . . : Monday, July 08, 2013 9:25:35 PM
    Lease Expires . . . . . . . . . . : Friday, July 12, 2013 6:15:26 PM
    Default Gateway . . . . . . . . . : fe80::201:5cff:fe24:bb41%11
    98.228.128.1
    DHCP Server . . . . . . . . . . . : 69.252.202.8
    DHCPv6 IAID . . . . . . . . . . . : 287362864
    DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-15-99-0E-CD-20-CF-30-AB-54-7A

    DNS Servers . . . . . . . . . . . : 2001:558:feed::1
    2001:558:feed::2
    75.75.75.75
    75.75.76.76
    NetBIOS over Tcpip. . . . . . . . : Enabled

    Wireless LAN adapter Wireless Network Connection:

    Media State . . . . . . . . . . . : Media disconnected
    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : 802.11n Wireless LAN Card
    Physical Address. . . . . . . . . : 00-25-D3-14-14-5B
    DHCP Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes

    Tunnel adapter isatap.hsd1.il.comcast.net.:

    Media State . . . . . . . . . . . : Media disconnected
    Connection-specific DNS Suffix . : hsd1.il.comcast.net.
    Description . . . . . . . . . . . : Microsoft ISATAP Adapter
    Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
    DHCP Enabled. . . . . . . . . . . : No
    Autoconfiguration Enabled . . . . : Yes

    Tunnel adapter Teredo Tunneling Pseudo-Interface:

    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
    Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
    DHCP Enabled. . . . . . . . . . . : No
    Autoconfiguration Enabled . . . . : Yes
    IPv6 Address. . . . . . . . . . . : 2001:0:9d38:953c:1c9c:3546:9d1b:78c3(Pref
    erred)
    Link-local IPv6 Address . . . . . : fe80::1c9c:3546:9d1b:78c3%12(Preferred)
    Default Gateway . . . . . . . . . :
    NetBIOS over Tcpip. . . . . . . . : Disabled

    Tunnel adapter isatap.{F878FEE4-D6EC-42D4-A75D-C8B2AD5E27F6}:

    Media State . . . . . . . . . . . : Media disconnected
    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
    Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
    DHCP Enabled. . . . . . . . . . . : No
    Autoconfiguration Enabled . . . . : Yes
  2. Best answer
    Have had a similar problem at work with this. It sounds like the default gateway or "router" is not defined within the DHCP scope. Do you have a router or only a modem? I'm not sure how comcast works but it may be something that you need them to define on their end. If you do have a router there should be DHCP options in there and you would need to put the IP address of your router as the default gateway.
  3. i only have the modem connected directly to the pc
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