Problems with Cisco DPQ3212 Cable Modem and NAT

Sat Feb 28 18:20:38 MST 2015

I tried to do that a while ago and failed due to it had a voip that needed
NAT internal for the phone part I also learned that it would not reboot to
apply new settings till the battery was removed for a while. I called Cox
and they swapped it for a separate phone and separate modem. no problem:)

On Sat, Feb 28, 2015 at 5:33 PM, David Demland <demland at cox.net> wrote:

> Does anyone know much about a Cisco DPQ3212 Cable Modem? Cox put it in a
> few months ago and I did not think much about it since every was working on
> my network. However recently I had to log onto a VPN for a customer and I
> could not. I started doing some checking and here is what I have found:
>
>
>
> Doing a traceroute from my PC shows the following:
>
>   1    <1 ms    <1 ms    <1 ms  881WRouter.42.168.192.in-addr.arpa
> [192.168.42.254]
>
>   2     8 ms     8 ms     7 ms  10.32.4.1
>
>   3     7 ms     7 ms     7 ms  172.21.1.224
>
>   4    18 ms    19 ms    29 ms  70.169.74.52
>
>   5    21 ms    21 ms    22 ms  langbprj02-ae14.0.rd.la.cox.net
> [68.1.0.151]
>
>   6    20 ms    21 ms    21 ms  72.14.215.221
>
>   7    20 ms    21 ms    21 ms  209.85.248.185
>
>   8   111 ms    32 ms    22 ms  209.85.142.91
>
>   9    21 ms    21 ms    21 ms  lax02s21-in-f4.1e100.net [216.58.216.4]
>
>
>
> Trace complete.
>
>
>
> Doing a traceroute from the router show:
>
>
>
> DemlandRouter#traceroute 216.58.216.4
>
> Type escape sequence to abort.
>
> Tracing the route to 216.58.216.4
>
> VRF info: (vrf in name/id, vrf out name/id)
>
>   1 10.32.4.1 12 msec 8 msec 8 msec
>
>   2 172.21.1.224 8 msec 8 msec 8 msec
>
>   3 70.169.74.52 32 msec 24 msec 32 msec
>
>   4 68.1.1.19 20 msec
>
>     68.1.5.139 20 msec 20 msec
>
>   5 72.14.215.221 24 msec 24 msec 20 msec
>
>   6 209.85.248.185 24 msec 24 msec 24 msec
>
>   7 209.85.142.91 24 msec 20 msec 24 msec
>
>   8 216.58.216.4 24 msec 20 msec 24 msec
>
>
>
> The router’s routing table looks like:
>
>
>
> DemlandRouter#show route
>
> route-map COX_NAT, permit, sequence 10
>
>   Match clauses:
>
>     ip address (access-lists): 110
>
>     interface FastEthernet4
>
>   Set clauses:
>
>   Policy routing matches: 0 packets, 0 bytes
>
> DemlandRouter#show ip route
>
> Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
>
>        D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
>
>        N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
>
>        E1 - OSPF external type 1, E2 - OSPF external type 2
>
>        i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS
> level-2
>
>        ia - IS-IS inter area, * - candidate default, U - per-user static
> route
>
>        o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
>
>        + - replicated route, % - next hop override
>
>
>
> Gateway of last resort is 98.165.177.1 to network 0.0.0.0
>
>
>
> S*    0.0.0.0/0 [1/0] via 98.165.177.1
>
>       10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
>
> C        10.0.42.0/24 is directly connected, Vlan20
>
> L        10.0.42.254/32 is directly connected, Vlan20
>
> C        10.42.0.0/24 is directly connected, Vlan1
>
> L        10.42.0.1/32 is directly connected, Vlan1
>
>       98.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
>
> C        98.165.177.0/24 is directly connected, FastEthernet4
>
> L        98.165.177.11/32 is directly connected, FastEthernet4
>
>       172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
>
> C        172.16.42.0/24 is directly connected, Vlan30
>
> L        172.16.42.254/32 is directly connected, Vlan30
>
>       172.19.0.0/32 is subnetted, 1 subnets
>
> S        172.19.73.61 [254/0] via 98.165.177.1, FastEthernet4
>
>       192.168.42.0/24 is variably subnetted, 2 subnets, 2 masks
>
> C        192.168.42.0/24 is directly connected, Vlan10
>
> L        192.168.42.254/32 is directly connected, Vlan10
>
>
>
> The modem’s IP is 192.168.100.1, seems rather standard, and I can http to
> the modem but all I get a status screen when I login. There is no username
> and password to get to the status screen; but the I cannot find an
> administrator login for the modem.
>
>
>
> Looking at all the output it seems clear that the modem is doing a NAT,
>  of private IP space 10.32.4.1, which would be a problem. I need to turn
> off the NAT so that everything works. That is the issue, I can find nothing
> on line about this and I have talk to Cox level two support and they have
> no idea.
>
>
>
> The think that confuses me most is that I am getting a valid public IP on
> my Router (I can even VPN in into my home network), but the traceroute
> never shows my packets going through the public IP. Does any know how to
> login into this modem and turn off NAT?
>
>
>
> Thank You,
>
>
>
> David
>
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-- 
Todd Cole
Ubuntu Arizona Team
4605 S PRIEST DR LOT 3
TEMPE AZ  85282-6507
toddc at azloco.com
602-677-9402
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