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Old 10-21-2010, 07:02 PM   #16
michaelk
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With a static IP you need to manually enter the DNS information in /etc/resolv.conf before you can ping outside the LAN. You should still be able to ping any computer/device inside the LAN.
 
Old 10-21-2010, 08:20 PM   #17
paulsm4
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Clarification (which I'm sure you both already know):
Quote:
With a static IP you need to manually enter the DNS information in /etc/resolv.conf before you can ping <BY HOSTNAME> outside the LAN. You should still be able to ping any computer/device inside the LAN.
You can ping anything you want by IP address just fine without a DNS server.

As long as you have an IP address defined.

Which, unfortunately, we're still trying to achieve

michaelk - do YOU have any ideas what the problem could be? I know this stuff inside/out (and I suspect Stephanie does, too) - but I'm stumped. She's got Centos 4.8, a Realtek RTL-8029 NIC, lspci sees it (and doesn't report any errors), and her config looks OK. She just can't get an address.

Any suggestions would DEFINITELY be appreciated!

TIA!

Last edited by paulsm4; 10-21-2010 at 08:29 PM.
 
Old 10-21-2010, 10:22 PM   #18
michaelk
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Quote:
You can ping anything you want by IP address just fine without a DNS server.
True statement. So can you ping 66.102.7.104 i.e. google.com? If so then we probably can assume it is not a hardware problem. We also have no confirmation that the computer can actually ping other computers on the same LAN so there could be a hardware problem.

However, after some googling the problem is not unique and might that the ne2k-pci module is broken.

http://www.linuxquestions.org/questi...6-10-a-281131/
http://forums.gentoo.org/viewtopic-t...1-start-0.html

Just to throw out some wild ideas, is IPV6 disabled?
 
Old 10-21-2010, 10:34 PM   #19
paulsm4
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Hi, Michaelk -

Good suggestions - thank you.

Another clarification: as far as I know, chickonlinux *cannot* ping 66.102.7.104. She can't do ANYTHING on her CentOS box.

Because she can't get an IP.

For reasons still unknown.

Please double-check her previous posts, and please make any suggestions you think might help. Personally, I was unaware of any issues (past or present) with RTL-8029 support: definitely a good thought. Any OTHER suggestions are equally welcome!
 
Old 10-21-2010, 10:34 PM   #20
chickonlinux
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I have tried 3 supposed compatible NICs so far.

Selinux does not exist in this minmal install. IPTABLES is the "firewall". Is there a REQUIRED minimal set of rules that needs to be set ?

Also aside from setting a default gateway in the routing table, is there any other necessary route ?

When I ping the default gateway, 192.168.1.1, I get a host unreachable message.

CABLES are fine. ROUTER is fine. I used the same CAT 5 cable and connected it to my old COMPAQ which I configured with the same static IP that I have been trying to use on the LINUX machine. The COMPAQ has full connectivity to the router, other machines on my LAN and the internet.

<SIGH>

I not giving up until this FREAKING NIC is working

:-)


Quote:
Originally Posted by paulsm4 View Post
Hi -

1. At its simplest level (which is absolutely all you need), "tcpdump" is really, really easy:

Here's an example:
Code:
tcpdump -nS > tmp.txt
<<wait a few moments, then Ctl-C>>

less tmp.txt
10:55:10.193469 IP zz.183.40.xxx.49985 > zz.99.83.xxx.ssh: . ack 3499409730 win 32920
10:55:10.193509 IP zz.99.83.xxx.ssh > zz.183.40.xxx.49985: P  499409846:3499410146(300) ack 4003329759 win 8576
10:55:10.242646 IP zz.183.40.xxx.49985 > zz.99.83.xxx.ssh: . ack  499410146 win 32504
10:55:12.499468 IP zz.183.40.xxx.49985 > zz.99.83.xxx.ssh: P  003329759:4003329811(52) ack 3499410146 win 32504
2. Here are two tcpdump links:
http://www.tcpdump.org/
http://danielmiessler.com/study/tcpdump/

3. Any luck on the "grasping at straws" suggestions (firewall and/or SELinux)?

4. Any chance to try swapping hardware (swap cable, swap NIC, try on a side-by-side PC, etc)?

Crossing my fingers
 
Old 10-21-2010, 11:24 PM   #21
paulsm4
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Hi, Stephanie -

1. I still don't have any definite answers for you. Sorry

2. I'll keep trying. And I'm crossing my fingers that maybe michaelk might have some good ideas, too

3. I also noticed that you opened at least one parallel thread, and that you got some flak for posting a query under "networking". I don't know why anybody objected - I would think that's the IDEAL forum to post this question. Sorry about that, too

4. I have a bunch of questions (and at least a few more suggestions) - but none of them are a "sure thing" (at least not yet), so I won't bore you with them.

However, there are three questions I *would* like to ask at this point:

Q: What exactly happened when you tried a static IP?

Q: Can you briefly summarize (in one place) the key steps you've taken in our adventure so far?

Q: All things being equal, what do YOU believe might be the most promising "plan of attack" for resolving this problem?

Thanx in advance .. Paul Santa Maria
 
Old 10-22-2010, 08:44 PM   #22
chickonlinux
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Well, Paul....you can smile and start applauding me.....

It works....the NIC takes a DHCP assignment now and I can ping stuff. !!!!!!!!


Believe it or not, I went into the BIOS for the old Pent II machine I have and changed a number of things. Im not sure which settings made the difference but it works now. I changed the following:

Turned on power management
Turned off the PLUG AND PLAY AWARE OS option(I think may have done it)
Enabled a few more IRQ's, 14 & 15

Imagine that, the bios on the motherboard was the cause of this. VERY interesting.

Me a very happy NEWBIE !



Quote:
Originally Posted by paulsm4 View Post
Hi -

1. At its simplest level (which is absolutely all you need), "tcpdump" is really, really easy:

Here's an example:
Code:
tcpdump -nS > tmp.txt
<<wait a few moments, then Ctl-C>>

less tmp.txt
10:55:10.193469 IP zz.183.40.xxx.49985 > zz.99.83.xxx.ssh: . ack 3499409730 win 32920
10:55:10.193509 IP zz.99.83.xxx.ssh > zz.183.40.xxx.49985: P  499409846:3499410146(300) ack 4003329759 win 8576
10:55:10.242646 IP zz.183.40.xxx.49985 > zz.99.83.xxx.ssh: . ack  499410146 win 32504
10:55:12.499468 IP zz.183.40.xxx.49985 > zz.99.83.xxx.ssh: P  003329759:4003329811(52) ack 3499410146 win 32504
2. Here are two tcpdump links:
http://www.tcpdump.org/
http://danielmiessler.com/study/tcpdump/

3. Any luck on the "grasping at straws" suggestions (firewall and/or SELinux)?

4. Any chance to try swapping hardware (swap cable, swap NIC, try on a side-by-side PC, etc)?

Crossing my fingers
 
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