[SLE] Roadrunner, Linksys, SUSE 8.2

From: Steve Miller (doctor_clyde_at_yahoo.com)
Date: 10/20/05

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Date: Thu, 20 Oct 2005 14:09:39 -0700 (PDT)
To: suse-linux-e@suse.com

Hi,

I recently subscribed to Roadrunner internet through
my cable provider. I fed the cable modem into a
Linksys router, which I configured according to Eric
Raymond's how-to at
http://en.tldp.org/HOWTO/Linksys-Blue-Box-Router-HOWTO/.

The ethernet card, if I recall correctly, I gave a
static IP address. I cloned the cable modem's MAC
address in the router, and set eth0's default gateway
to the router's address. This worked beautifully, as
did my phone modem (which I want for backup) for a
couple of days until I made the mistake of powering
everything down for a few days while I was out of
town.

On my return, browsing would hang during host
resolution whether I used the cable modem or the phone
modem. I eventually undid everything, including my
ethernet card configuration, and got back the phone
modem.

After this, all attempts to repeat my previous cable
modem success failed. At best I get a very quick ...
not found". I clearly have some DNS issue, but do not
see what I can do about it. Oh yeah, and although I
understand that connecting with the phone modem is
supposed to override the ethernet networking shtuff, I
can't use that either.

What I have: Linux box running SUSE 8.2, cable modem
with 192.168.1.1 as address, router with same IP
address (I don't think I can change this, but it also
was not a problem before, ethernet card in PC with
192.168.1.2 address.

From a couple of related threads on SLE, I determined
that I could run some diagnostics. I reproduce these
below. I have two configurations there (static IP
address and DHCP-assigned address for router).

I have the SUSE personal firewall on the Linux box. I
am not running a server or anything else, so I block
all services.

Questions: What (if anything) seems to be wrong? What
other info could help? What else can I try?

Best, due to a tight schedule, would be a quick
cookbook procedure for just getting the stupid thing
to work until I can actually learn something about
networking later....

Thanks for your time!

Steve

I. Diagnostics w/ static IP for eth0 ----------

% ifdown eth0
% ifup eth0
[no output]

% ifconfig -a

eth0 Link encap:Ethernet HWaddr
00:0F:B5:47:BC:71
          inet addr:192.168.1.2 Bcast:192.168.1.255
Mask:255.255.255.0
          inet6 addr: fe80::20f:b5ff:fe47:bc71/64
Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500
Metric:1
          RX packets:17325 errors:0 dropped:0
overruns:0 frame:0
          TX packets:16744 errors:0 dropped:0
overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:5427875 (5.1 Mb) TX bytes:1398129
(1.3 Mb)
          Interrupt:9 Base address:0x9000

lo Link encap:Local Loopback
          inet addr:127.0.0.1 Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING MTU:16436 Metric:1
          RX packets:334 errors:0 dropped:0 overruns:0
frame:0
          TX packets:334 errors:0 dropped:0 overruns:0
carrier:0
          collisions:0 txqueuelen:0
          RX bytes:24746 (24.1 Kb) TX bytes:24746
(24.1 Kb)

sit0 Link encap:IPv6-in-IPv4
          NOARP MTU:1480 Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0
frame:0
          TX packets:0 errors:0 dropped:0 overruns:0
carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

vmnet1 Link encap:Ethernet HWaddr
00:50:56:C0:00:01
          BROADCAST MULTICAST MTU:1500 Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0
frame:0
          TX packets:46 errors:0 dropped:0 overruns:0
carrier:0
          collisions:0 txqueuelen:100
          RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

vmnet8 Link encap:Ethernet HWaddr
00:50:56:C0:00:08
          BROADCAST MULTICAST MTU:1500 Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0
frame:0
          TX packets:7 errors:0 dropped:0 overruns:0
carrier:0
          collisions:0 txqueuelen:100
          RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

% route
Kernel IP routing table
Destination Gateway Genmask Flags
Metric Ref Use
Iface
192.168.1.0 * 255.255.255.0 U
0 0 0
eth0
default 192.168.1.1 0.0.0.0 UG
0 0 0
eth0

%netstat -nr
Kernel IP routing table
Destination Gateway Genmask Flags
MSS Window irtt
Iface
192.168.1.0 0.0.0.0 255.255.255.0 U
0 0 0
eth0
0.0.0.0 192.168.1.1 0.0.0.0 UG
0 0 0
eth0

II. Diagnostics w/ DHCP assigned address for eth0
----------

% ifdown eth0
% ifup eth0
Starting DHCP Client Daemon on eth0... IP/Netmask:
192.168.1.100 / 255.255.255.0

% ifconfig -a

eth0 Link encap:Ethernet HWaddr
00:0F:B5:47:BC:71
          inet addr:192.168.1.100 Bcast:192.168.1.255

Mask:255.255.255.0
          inet6 addr: fe80::20f:b5ff:fe47:bc71/64
Scope:Link
          UP BROADCAST NOTRAILERS RUNNING MULTICAST
MTU:1500 Metric:1
          RX packets:49 errors:0 dropped:0 overruns:0
frame:0
          TX packets:98 errors:0 dropped:0 overruns:0
carrier:0
          collisions:0 txqueuelen:100
          RX bytes:6196 (6.0 Kb) TX bytes:9724 (9.4
Kb)
          Interrupt:9 Base address:0xc000

lo Link encap:Local Loopback
          inet addr:127.0.0.1 Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING MTU:16436 Metric:1
          RX packets:10 errors:0 dropped:0 overruns:0
frame:0
          TX packets:10 errors:0 dropped:0 overruns:0
carrier:0
          collisions:0 txqueuelen:0
          RX bytes:652 (652.0 b) TX bytes:652 (652.0
b)

Kernel IP routing table
Destination Gateway Genmask Flags
Metric Ref Use
Iface
192.168.1.0 * 255.255.255.0 U
0 0 0
eth0
default 192.168.1.1 0.0.0.0 UG
0 0 0
eth0

%netstat -nr

Kernel IP routing table
Destination Gateway Genmask Flags
MSS Window irtt
Iface
192.168.1.0 0.0.0.0 255.255.255.0 U
0 0 0
eth0
0.0.0.0 192.168.1.1 0.0.0.0 UG
0 0 0
eth0

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