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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