Ubuntu Networking problem

10-18-2008, 06:16 AM

Respected Sir/Madam,

I am using HP Proliant DL 145 G2 with AMD Opteron server.
It is giving internet problem after changing the mother board.
This server is in lan. Whenever I used to connect I cannot get dirctly
I have to change the back side port. then it gets connected.
For example today I connected to port1, after restartig/starting the machine
I have to change the port then its gets connected to internet/lan.

When I check if config it is showing

************************************************** *******************
mm5@node2:~$ ifconfig
eth2***** Link encap:Ethernet* HWaddr 00:17:A4:FF:77:B5
********* inet addr:192.168.1.80* Bcast:192.168.1.255*
Mask:255.255.255.0
********* inet6 addr: fe80::217:a4ff:feff:77b5/64 Scope:Link
********* UP BROADCAST RUNNING MULTICAST* MTU:1500* Metric:1
********* RX packets:0 errors:0 dropped:0 overruns:0 frame:0
********* TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
********* collisions:0 txqueuelen:1000
********* RX bytes:0 (0.0 b)* TX bytes:492 (492.0 b)
********* Interrupt:233

eth3***** Link encap:Ethernet* HWaddr 00:17:A4:FF:77:B4
********* inet addr:192.168.1.80* Bcast:192.168.1.255*
Mask:255.255.255.0
********* inet6 addr: fe80::217:a4ff:feff:77b4/64 Scope:Link
********* UP BROADCAST MULTICAST* MTU:1500* Metric:1
********* RX packets:293 errors:0 dropped:0 overruns:0 frame:0
********* TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
********* collisions:0 txqueuelen:1000
********* RX bytes:38783 (37.8 KiB)* TX bytes:620 (620.0 b)
********* Interrupt:50

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:25 errors:0 dropped:0 overruns:0 frame:0
********* TX packets:25 errors:0 dropped:0 overruns:0 carrier:0
********* collisions:0 txqueuelen:0
********* RX bytes:2040 (1.9 KiB)* TX bytes:2040 (1.9 KiB)
************************************************** *******************

But when I see the /etc/iftab file it shows

eth0 mac 00:13:21:b5:31:6f arp 1
eth1 mac 00:13:21:b5:31:70 arp 1
************************************************** *******************

How can I solve the problem
Please kindly suggest me to solve the problem
Thanking you
Sincerely
D.
Srinivas
*Desamsetti Srinivas
Research Scholar
Department of Meteorology and Oceanography
Andhra University
Visakhapatnam - 530 003
91 9948530618 (M)
sreeds82@yahoo.com
sreeds82@rediffmail.com

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10-18-2008, 06:03 PM

For some reason your email was in google junk mail.

On Sat, Oct 18, 2008 at 8:16 AM, sreenivas desamsetti
<sreeds82@yahoo.com> wrote:
> Respected Sir/Madam,
>
> I am using HP Proliant DL 145 G2 with AMD Opteron server.
> It is giving internet problem after changing the mother board.
> This server is in lan. Whenever I used to connect I cannot get dirctly
> I have to change the back side port. then it gets connected.
> For example today I connected to port1, after restartig/starting the machine
> I have to change the port then its gets connected to internet/lan.
>
> When I check if config it is showing
>
> ************************************************** *******************
> mm5@node2:~$ ifconfig
> eth2 Link encap:Ethernet HWaddr 00:17:A4:FF:77:B5
> inet addr:192.168.1.80 Bcast:192.168.1.255 Mask:255.255.255.0
> inet6 addr: fe80::217:a4ff:feff:77b5/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:0 (0.0 b) TX bytes:492 (492.0 b)
> Interrupt:233
>
> eth3 Link encap:Ethernet HWaddr 00:17:A4:FF:77:B4
> inet addr:192.168.1.80 Bcast:192.168.1.255 Mask:255.255.255.0
> inet6 addr: fe80::217:a4ff:feff:77b4/64 Scope:Link
> UP BROADCAST MULTICAST MTU:1500 Metric:1
> RX packets:293 errors:0 dropped:0 overruns:0 frame:0
> TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:38783 (37.8 KiB) TX bytes:620 (620.0 b)
> Interrupt:50
>
> 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:25 errors:0 dropped:0 overruns:0 frame:0
> TX packets:25 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:2040 (1.9 KiB) TX bytes:2040 (1.9 KiB)
> ************************************************** *******************
>
> But when I see the /etc/iftab file it shows
>
> eth0 mac 00:13:21:b5:31:6f arp 1
> eth1 mac 00:13:21:b5:31:70 arp 1
> ************************************************** *******************
>
> How can I solve the problem
> Please kindly suggest me to solve the problem
> Thanking you
> Sincerely
> D. Srinivas
>
> Desamsetti Srinivas
> Research Scholar
> Department of Meteorology and Oceanography
> Andhra University
> Visakhapatnam - 530 003
> 91 9948530618 (M)
> sreeds82@yahoo.com
> sreeds82@rediffmail.com
--
Douglas E Knapp

http://sf-journey-creations.wikispot.org/Front_Page

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10-18-2008, 06:20 PM

sreenivas desamsetti wrote:
> I am using HP Proliant DL 145 G2 with AMD Opteron server.
> It is giving internet problem after changing the mother board.
> This server is in lan. Whenever I used to connect I cannot get dirctly
> I have to change the back side port. then it gets connected.
> For example today I connected to port1, after restartig/starting the
> machine I have to change the port then its gets connected to
> internet/lan.

So if I understand it right, your connector for port1 is sometimes at the
interface eth2 and sometimes at eth3?

> When I check if config it is showing
>
> eth2 Link encap:Ethernet HWaddr 00:17:A4:FF:77:B5
> inet addr:192.168.1.80 Bcast:192.168.1.255
>
> eth3 Link encap:Ethernet HWaddr 00:17:A4:FF:77:B4
> inet addr:192.168.1.80 Bcast:192.168.1.255

That looks suspicious. Both interfaces have the same IP address. Do you
use a manual setup for your interfaces or do you get your configuration
via DHCP?

> But when I see the /etc/iftab file it shows
>
> eth0 mac 00:13:21:b5:31:6f arp 1
> eth1 mac 00:13:21:b5:31:70 arp 1

I don't see a contradiction here. Probably eth0 and eth1 were used for the
previous main board. As the new mac addresses are not included in this
file the association of LAN port and interface isn't fixed and may change
at each boot. You could write the mac addresses of your new main board to
this file and then the old configuration should work again even if you
have a static setup for eth0 / eth1.

OTOH, /etc/iftab isn't used by recent Ubuntu versions. Therefore please
tell us which ubuntu version you are using. Ubuntu 8.04 (and I think 7.04
and 7.10 as well) use /etc/udev/rules.d/70-persistent-net.rules for the
association of mac addresses and interface name.

Nils

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10-18-2008, 06:38 PM

Knapp wrote:
> For some reason your email was in google junk mail.

I'm glad I don't use Gmail

Nils

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10-18-2008, 11:52 PM

On 10/18/2008 11:38 AM, Nils Kassube wrote:
> Knapp wrote:
>> For some reason your email was in google junk mail.
>
> I'm glad I don't use Gmail

>
>
> Nils
>

Or top post :-)

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10-20-2008, 09:51 AM

Respected Sir/Madam,

I am using HP Proliant DL 145 G2 with AMD Opteron server.
It is giving internet problem after changing the mother board.
This server is in lan. Whenever I used to connect I cannot get dirctly
I have to change the back side port. then it gets connected.
For example today I connected to port1, after restartig/starting the machine
I have to change the port then its gets connected to internet/lan.

When I check if config it is
showing

************************************************** *******************
mm5@node2:~$ ifconfig
eth2***** Link encap:Ethernet* HWaddr 00:17:A4:FF:77:B5
********* inet addr:192.168.1.80* Bcast:192.168.1.255*
Mask:255.255.255.0
********* inet6 addr: fe80::217:a4ff:feff:77b5/64 Scope:Link
********* UP BROADCAST RUNNING MULTICAST* MTU:1500* Metric:1
********* RX packets:0 errors:0 dropped:0 overruns:0 frame:0
********* TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
********* collisions:0 txqueuelen:1000
********* RX bytes:0 (0.0 b)* TX bytes:492 (492.0 b)
********* Interrupt:233

eth3***** Link encap:Ethernet* HWaddr 00:17:A4:FF:77:B4
********* inet addr:192.168.1.80* Bcast:192.168.1.255*
Mask:255.255.255.0
********* inet6 addr: fe80::217:a4ff:feff:77b4/64 Scope:Link
********* UP BROADCAST MULTICAST* MTU:1500* Metric:1
********* RX packets:293 errors:0 dropped:0 overruns:0 frame:0
********* TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
********* collisions:0 txqueuelen:1000
********* RX bytes:38783 (37.8 KiB)* TX bytes:620 (620.0 b)
********* Interrupt:50

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:25 errors:0 dropped:0 overruns:0 frame:0
********* TX packets:25 errors:0 dropped:0 overruns:0 carrier:0
********* collisions:0 txqueuelen:0
********* RX bytes:2040 (1.9 KiB)* TX bytes:2040 (1.9 KiB)
************************************************** *******************

But when I see the /etc/iftab file it shows

eth0 mac 00:13:21:b5:31:6f arp 1
eth1 mac 00:13:21:b5:31:70 arp 1
************************************************** *******************

How can I solve the problem
Please kindly suggest me to solve the problem
Thanking you
Sincerely
D.
Srinivas*Desamsetti Srinivas
Research Scholar
Department of Meteorology and Oceanography
Andhra University
Visakhapatnam - 530 003
91 9948530618 (M)
sreeds82@yahoo.com
sreeds82@rediffmail.com

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