RE: Network connectivity problem on Netview Server

[z_esm_karekars <z_esm_karekars@bharatpetroleum.com>]

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Hi Lesli, Ray

        1. This is RS600 Server H270
        2. It is having two N/W interfaces but working only on one i.e.
"en1"       which is set for Twisted Pair
        3. No. of objects having problem of N/W connectivity is not fixed as
well the nodes are not specific.
        4. After resetting the receive buffer stats it does not increment
        5. What shall I check specific for subnet masks.
        6. WHat value should I set for "no -o route_expire= ?" command is it
"o" or "1"
        7. I checked the port stats are normal and swapped the ports and
the network points wall outlets also to isolate the port or cabling
related issue.
        8. "errpt" does not give any errors related to ethernet adapter

Lesli >> Can U pls send me the procedure for increasing arp cache size

Regads,
Santosh
> ----------
> From:         Leslie Clark[SMTP:lclark@US.IBM.COM]
> Reply To:     IBM NetView Discussion
> Sent:         Tuesday, March 20, 2001 6:02 PM
> To:   IBM NetView Discussion
> Subject:      Re: [NV-L] Network connectivity problem on Netview Server
> 
> And if it is AIX 4.3.3, and you are using ATM, know that the default size
> of
> the arp cache may be too small, and things may be aged out. I'll post
> the full explanation in a separate note, since I just tried to check the
> archives
> and they don't seem to be there at the moment!
> 
> Cordially,
> 
> Leslie A. Clark
> IBM Global Services - Systems Mgmt & Networking
> Detroit
> 
> 
> "Ray" <westphal@accessus.net>@tkg.com on 03/19/2001 07:26:36 PM
> 
> Please respond to IBM NetView Discussion <nv-l@tkg.com>
> 
> Sent by:  owner-nv-l@tkg.com
> 
> 
> To:   "IBM NetView Discussion" <nv-l@tkg.com>
> cc:
> Subject:  Re: [NV-L] Network connectivity problem on Netview Server
> 
> 
> 
> 
> Hi Santosh!
> 
> I think we need more information. 1st question  - what type of server?
> However, here is a few things to check:
> 
>     Since the loss of connectivity  is to devices on the same network
> (correct?), check your network adapter(s) on  the NetView server.
> 
>     1) Is it 100MB Full Duplex?
>     2) Does it match the switch  settings? I avoid using auto negotiate on
> the switch or server  adapter.
>     3) How many adapters on your  server? How many objects on the network
> you are having problems  with?
>     4) Have you checked receive  buffer stats on the NetView servers
> ethernet adapter? i.e entstat -d en0.
>         Check  the No Receive Buffer counter. entstat -r en0 will reset
> it.
> It is incrementing  at all?
>     5) Check your network masks  on the objects.
>     6) Since these objects are on  the same network - you should not be
> losing routes correct?
>         If you  want routes to remain, check the "no" command route_expire
> option.
>     7) Check your switch statistics  for errors on the port.
>     8) Check your errpt command. Any  ethernet adapter errors? Any
> ethernet
> adapter recovery events?
>     9) Have you checked your  cabling?
> 
> 
> 
> HTH.
> Ray Westphal.
> 
> 
> ----- Original Message -----
> From:  z_esm_karekars
> To: 'nv-l@tkg.com'
> Sent: Monday, March 19, 2001 1:01  AM
> Subject: [NV-L] Network connectivity  problem on Netview Server
> 
> Hi,
> 
> I had AIX Ver. 4.3 with FrameWork 3.7 & NetView  Ver. 6.0.
> 
> Facing problem of Network connetcivity loss to some  random nodes on same
> N/W, this gets restored some times after reboot of AIX  server once, and
> sometimes it needs reboot more than once. Is it bug ? I had  applied the
> patch for Framework available on NetView 6.0 CD.
> 
> I had reloaded AIX, Framework, NetView on the same  Server to isolate the
> problem may be of earlier configuration.
> 
> Please reply.
> 
> Regards,
> Santosh  Karekar
> 
> 
> 
> _________________________________________________________________________
> NV-L List information and Archives: http://www.tkg.com/nv-l
>

Hi Lesli, Ray

        1. This is RS600 Server H270
        2. It is having two N/W interfaces but working only on one i.e. "en1"       which is set for Twisted Pair
        3. No. of objects having problem of N/W connectivity is not fixed as        well the nodes are not specific.
        4. After resetting the receive buffer stats it does not increment
        5. What shall I check specific for subnet masks.
        6. WHat value should I set for "no -o route_expire= ?" command is it        "o" or "1"
        7. I checked the port stats are normal and swapped the ports and                    the network points wall outlets also to isolate the port or cabling             related issue.

        8. "errpt" does not give any errors related to ethernet adapter

Lesli >> Can U pls send me the procedure for increasing arp cache size

Regads,
Santosh

----------
From:   Leslie Clark[SMTP:lclark@US.IBM.COM]
Reply To:       IBM NetView Discussion
Sent:   Tuesday, March 20, 2001 6:02 PM
To:     IBM NetView Discussion
Subject:        Re: [NV-L] Network connectivity problem on Netview Server

And if it is AIX 4.3.3, and you are using ATM, know that the default size
of
the arp cache may be too small, and things may be aged out. I'll post
the full explanation in a separate note, since I just tried to check the
archives
and they don't seem to be there at the moment!

Cordially,

Leslie A. Clark
IBM Global Services - Systems Mgmt & Networking
Detroit




"Ray" <westphal@accessus.net>@tkg.com on 03/19/2001 07:26:36 PM

Please respond to IBM NetView Discussion <nv-l@tkg.com>

Sent by:  owner-nv-l@tkg.com




To:   "IBM NetView Discussion" <nv-l@tkg.com>
cc:
Subject:  Re: [NV-L] Network connectivity problem on Netview Server






Hi Santosh!

I think we need more information. 1st question  - what type of server?
However, here is a few things to check:

    Since the loss of connectivity  is to devices on the same network
(correct?), check your network adapter(s) on  the NetView server.

    1) Is it 100MB Full Duplex?
    2) Does it match the switch  settings? I avoid using auto negotiate on
the switch or server  adapter.
    3) How many adapters on your  server? How many objects on the network
you are having problems  with?
    4) Have you checked receive  buffer stats on the NetView servers
ethernet adapter? i.e entstat -d en0.
        Check  the No Receive Buffer counter. entstat -r en0 will reset it.
It is incrementing  at all?
    5) Check your network masks  on the objects.
    6) Since these objects are on  the same network - you should not be
losing routes correct?
        If you  want routes to remain, check the "no" command route_expire
option.
    7) Check your switch statistics  for errors on the port.
    8) Check your errpt command. Any  ethernet adapter errors? Any ethernet
adapter recovery events?
    9) Have you checked your  cabling?





HTH.
Ray Westphal.




----- Original Message -----
From:  z_esm_karekars
To: 'nv-l@tkg.com'
Sent: Monday, March 19, 2001 1:01  AM
Subject: [NV-L] Network connectivity  problem on Netview Server

Hi,

I had AIX Ver. 4.3 with FrameWork 3.7 & NetView  Ver. 6.0.

Facing problem of Network connetcivity loss to some  random nodes on same
N/W, this gets restored some times after reboot of AIX  server once, and
sometimes it needs reboot more than once. Is it bug ? I had  applied the
patch for Framework available on NetView 6.0 CD.

I had reloaded AIX, Framework, NetView on the same  Server to isolate the
problem may be of earlier configuration.

Please reply.

Regards,
Santosh  Karekar





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