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Forums » US Telco Support » AT&T » AT&T Midwest » Modem GUI w/ Router - ISO Definitive Answer
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Modem setup with Sonicwall TZ170 »
« 5100b setup  

BadtzMaru

join:2001-12-06
Cleveland, OH

Re: Modem GUI w/ Router - ISO Definitive Answer

said by RadioDoc See Profile:

No I think I got it right the the first time. The issue is mostly one of what IP address the modem is handing out to the router's WAN port, and how your router handles having the same address segment(s) on each interface.
But by default, the modem gives anything behind it a public IP address -- and this is a good thing since it avoids having to deal with double-NAT.

root@smoothwall~# ifconfig
eth0      Link encap:Ethernet  HWaddr 0?:?0:2?:16:?B:?9
          inet addr:192.168.1.1  Bcast:192.168.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:108914 errors:0 dropped:0 overruns:0 frame:0
          TX packets:80639 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:86616849 (82.6 Mb)  TX bytes:27983129 (26.6 Mb)
          Interrupt:9 Base address:0x8000

eth1      Link encap:Ethernet  HWaddr 00:A0:CC:28:C5:09
          inet addr:68.255.???.???  Bcast:68.255.???.???  Mask:255.255.255.0
          UP BROADCAST NOTRAILERS RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:74586 errors:2 dropped:0 overruns:0 frame:0
          TX packets:106498 errors:1 dropped:0 overruns:0 carrier:1
          collisions:0 txqueuelen:1000
          RX bytes:19365573 (18.4 Mb)  TX bytes:86529362 (82.5 Mb)
          Interrupt:11 Base address:0xd800

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:127 errors:0 dropped:0 overruns:0 frame:0
          TX packets:127 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:13051 (12.7 Kb)  TX bytes:13051 (12.7 Kb)
permalink · 2005-04-07 21:54:06 · Print · Reply to this
RadioDoc
58ef2c0
Premium,ExMod 2000-03
join:2000-05-11
·AT&T Midwest

Re: Modem GUI w/ Router - ISO Definitive Answer

Yep. That's true. But it will still cause trouble if you try to overlap it's 192.168.0.x subnet regardless of what your router gets on it's WAN interface. That's how you get to the admin interface, and if your router thinks it's a LAN address it won't pass it to the modem.

Double-NAT isn't much of a problem on this modem since it passes everything through, sort of like a DMZ situation.

In any event, glad to hear you figured it out.
permalink · 2005-04-07 23:23:49 · Reply to this
Forums » US Telco Support » AT&T » AT&T MidwestModem setup with Sonicwall TZ170 »
« 5100b setup  

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