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Ubuntu 10.04 network - no direct access

Posted on 2011-04-19
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Last Modified: 2012-05-11
Here is one that has me stumped.

I have a Realtek network card:
01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 03)

I have the default gateway set correctly and no outbound filtering on the border firewall (Netgear FVS338).

I can access anything on the local network directly.
I can access external sites through a proxy on the network.
I can't access external sites directly.

I have a laptop next to me that works fine.

I've rebooted the firewall, but it doesn't help.
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Question by:mccracky
10 Comments
 
LVL 8

Expert Comment

by:pilson66
ID: 35427139
Check the DNS record in yur notebook, and set up this DNS in you computer in tenwork preferences.
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Author Comment

by:mccracky
ID: 35427194
the two /etc/resolv.conf files are the same (and the problem also applies when I ping an external IP address).
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Expert Comment

by:pilson66
ID: 35427216
Your computer are resolve DNS names ?
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LVL 31

Expert Comment

by:farzanj
ID: 35427247
Check routes of both

route -n
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Author Comment

by:mccracky
ID: 35427266
routes fine. (default gateway set)

dns resolution fine.

can ping gateway, but not beyond gateway.
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LVL 8

Expert Comment

by:myramu
ID: 35427449
Hello Mccraky,

Your issue states clearly there is a problem in the default routing (0.0.0.0/0.0.0.0). Please verify the kernel route entries.
May be by mistake the destination n/w is wrongly added towards the router IP address.

Refer the following link for route addition on ubuntu,
http://www.ubuntugeek.com/howto-add-permanent-static-routes-in-ubuntu.html

Good Luck!
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LVL 12

Author Comment

by:mccracky
ID: 35427603
# netstat -rn
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
10.18.0.0      0.0.0.0         255.255.0.0     U         0 0          0 eth0
0.0.0.0         10.18.0.1      0.0.0.0         UG        0 0          0 eth0


ifconfig:
# ifconfig eth0
eth0      Link encap:Ethernet  HWaddr 00:25:xx:xx:xx:xx  
          inet addr:10.18.0.14  Bcast:10.18.255.255  Mask:255.255.0.0


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Expert Comment

by:crazedsanity
ID: 35433071
Try running a traceroute on the server and compare it to the same command on the laptop.  Posting those results might be helpful.
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Accepted Solution

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mccracky earned 0 total points
ID: 35491910
I'm still not sure what is going on.  It might be a problem with the Realtek card or driver, but it is VERY strange.  For now, I put in an Intel PCI network adapter and disabled the onboard LAN and things are working.
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LVL 12

Author Closing Comment

by:mccracky
ID: 35687910
No full solution to the actual problem was found.  Substituting another card did get around the problem though it is using the only PCI slot in the machine, which I might need for a better sound card later.
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