Unable to iosolate HP server from existing network

[Jason Chia]

Hi,

We would like to isolate a HP-UX server(A) from existing network to a hub connected with another server(B) in another isolated network.

When we unplug the network cable from the HP-UX server(A) and connect it to a hub. We are unable to ping from server(B) to the HP-UX server(A).

Syslog in Server(A) shown network errors as follow:
Nov 28 19:32:03 uxipos03 vmunix: btlan3: NOTE: MII Link Status Not OK - Switch C
onnection to AUI at 0/0/0/0....
Nov 28 19:44:36 uxipos03 vmunix: btlan3: NOTE: MII Link Status Not OK - Switch C
onnection to AUI at 0/0/0/0....
Nov 28 19:51:44 uxipos03 above message repeats 30 times
Nov 28 19:44:45 uxipos03 vmunix: btlan3: timeout: DMA timeout occurred at 0/0/0/
0
Nov 28 19:51:44 uxipos03 above message repeats 31 times
Nov 28 19:44:45 uxipos03 vmunix: btlan3: reset state is 550 at 0/0/0/0....
Nov 28 19:51:44 uxipos03 above message repeats 31 times
Nov 28 19:44:45 uxipos03 vmunix: btlan3: WARNING: AUI Loopback Failed at 0/0/0/0
Nov 28 19:51:44 uxipos03 above message repeats 31 times

Any configuration we need to perform in server A first before unplug the network cable ? Appreciate anyone can advises. Thanks.

Regards,
Jason Chia

[Ravi_8]

Hi,

log says that MII Link is not OK..

check the network port to which you are connecting now.

[Jason Chia]

Hi Ravi,

I had checked the connection to hub,it is ok. However the hub LED blinking like mad for Server(A). Do I need to change any configuration in server (A) before unplug the network cable and plugin to the hub ?

[Ravi_8]

Hi, Jason

pls let's know whether you are moving server(A) to different network/subnet or in the existing network you are moving server(A) to a different port in the hub

[T G Manikandan · Accepted solution]

The problem should definitely be

1.check your duplex and speed settings on both ends.

Make sure that both the ends match with duplex and speed settings.

2.Try changing the cable.


Thanks

[sven verhaegen]

Hi

Some remarks , this card is using BTLAN3 as driver , this tells me this is a 100MB lancard , you are trying to plug it into a HUB , unfortunately the only thing a hub supports is 10MB , you cannot hang 100mb on it , furhter the lancard is normally made to do speed sensing and duplex negotiation , either your lancard cannot set the duplex and speed setting projecting to the hub and therefore it just goes to this error message stream or you have not installed the necessary patching for the lancard causing it to break down on not being able to negotiate , normally you shouldn't connect a 10/100mb card on anythingh else then a switch

[sven verhaegen]

additionally I would suggest you force the lancard to a steady speed and duplex being 10 Half-Duplex as that is the only supported option .. doing this requires you to adapt the /etc/rc.config.d/hp...conf file specific for your lancard type , filling out the landrivername of the card togetehtr with the speed option 10HD , at bootup it will no longer negotiate , if you still have sensing problems make sure you use category 5 cabling

(always make sure you have the latest ARPA transport , LAN cummulative and the card specific patch for your lancard installed)

[Jason Chia]

Hi all,

Thanks for your prompt replies.

Yes, the problem might be caused by the server(A) LAncard set to 100Mbps Duplex. The hub only support 10Mbps. We had one switch but it only can detect 10Mbps (Don't know why).

I will try it again with a 100Mbps switches this weekend. Cheers.

Regards,
Jason