03-09-2020
Quote:
Yes, I understand.
When on a LAN segment you should also realize that every hardware interface to the LAN can have a different characteristic.
Some ethernet cards are more "chatty" and some are less "chatty" and some are "old" and others are "new" and some have drivers / firmware written by "A" and others have drivers / firmware written by "B".
You say "you don't have a lot of knowledge"... that's normal.
So, I am telling you what an experienced network engineer with a lot of knowledge would so.
If I had a busy LAN segment with a lot of devices on the same segment (subnet), as you have indicated, and I had two devices which I wanted to have the best communication speed between them, I would put them on their own LAN segment (subnet) and "be done with it" and maybe "retest" when the two devices are the only two devices (or three if you have a different gateway device) on that segment.
Quote:
Originally Posted by
RecoveryOne
This is a pretty large box, a E870 as a matter of fact. Is the network coming from a VIO? If so: Is the VIO network setup correctly? Does the VIO have the correct resource assignments to provide services to however many lpars you have running?
I ask the above because I encountered an issue where the VIO was set up by an MSP and what was happening is every so often the active network path would switch from say c1-p1-t1 to c10-p1-t1. That would cause a momentary ping delay. Much like what you are seeing. My network team was the first to report it to me, as they would see the MAC for the etherchannel device change which port it was reporting on the switch. The item they sent me was %SW_MATM-4-MACFLAP_NOTIF. It was caused by the etherchannel on the VIO having two primary adapters and no backup adapter. Taking one of the primary adapters and moving it to the backup adapter fixed the issue. Your results may vary.
If they are dedicated adapters and not coming from the VIO, again check your AIX configuration. Something to note, your tcp_recvspace and rfc1323 are not consistent with your adapters. That might be by design, but gives me pause that network wasn't set up correctly.
Now, everything else that everyone has posted here comes into play as well, and I'm not a network admin so I cannot weigh in on the other topics presented here.
Push comes to shove, start a ticket with the IBM AIX team.
We're running with full resources, no VIO.
We've asked network team to recheck the network. We are also planning to upgrade OS to 7.1 to get help from IBM.
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Solaris Server (V880) version 8
Brand new box just installed O/S, what do I need to do in order to get FTP working.
I have updated the /etc/hosts.equiv file
Problem - When trying to ftp to the server I get a login incorrect message, this is with the root user.
Are there some... (1 Reply)
Discussion started by: miredale
1 Replies
2. UNIX for Dummies Questions & Answers
I have a network connection problem in unix. I am trying to access to LAN in unix but unfortunately it doesn't work. For example, if I ping from Unix to windows it says 'the network is unreacable'. Also, I can't ping in windows to unix.
I would be glad if someone could help me.
Thanks.
... (5 Replies)
Discussion started by: fatihshen
5 Replies
3. Cybersecurity
Hi - I have a SUSE Enterprise Linux Server V9 that I have an issue with. Policy says that root connectivity via ssh needs to be disabled. So, to do that, I made the following change in the sshd_config section:
# Authentication:
#LoginGraceTime 2m
#PermitRootLogin yes
PermitRootLogin no... (3 Replies)
Discussion started by: cpolikowsky
3 Replies
4. Solaris
Hi ,
when i try to passwordless connection login in ssh through putty, i am getting the "Server unexpectedly closed network connection" error.i have already finished the public and private key settings for the particular user.
thanks
MaroV (1 Reply)
Discussion started by: vr_mari
1 Replies
5. AIX
Dear ALL.
I installed AIX OS on customer sites.
but Only one site is too slow when I connected telnet, ftp..
Ping is too fast. but telnet and FTP is not connected..
of course i check the configuration file on aix but it's normal.
Do any Idea??
thanks in advance.
- Jun - (3 Replies)
Discussion started by: Jeon Jun Seok
3 Replies
6. Solaris
Hi everyone,
I am hoping anyone of you could help me in this weird problem we have in 1 of our Solaris 10 servers. Lately, we have been having some ftp problems in this server. Though it can ping any server within the network, it seems that it can only ftp to a select few. For most servers, the... (4 Replies)
Discussion started by: labdakos
4 Replies
7. AIX
Hi,
I have a task requested by my boss to create a script to enable a server to connect to a vpn network and then to connect to another server to upload some data...
How can I connect to a vpn network from AIX server? via telnet? ssh?
I have tried to google but mostly the answers are... (1 Reply)
Discussion started by: mushr00m
1 Replies
8. UNIX for Advanced & Expert Users
Solaris 10 Server refuse to connect :wall:
fork: Resource temporarily unavailable , server unexpectedly unavailable network connection , refuse error, disconnect message, fatal error type2, (protocol error type2)
Issue has been resolved after taken few steps :b:
First of all need to check... (1 Reply)
Discussion started by: taherahmed
1 Replies
9. Ubuntu
Hi
I hope someone can spot what is wrong with this ssh connection as it has me baffled.
I am trying to set up a remote ssh connection (passwordless) to a remote 'server', (Ubuntu laptop at home).
I have tried these steps with rsa and dsa key types, (currently dsa) -
1) ssh-keygen... (4 Replies)
Discussion started by: steadyonabix
4 Replies
10. AIX
HI ,
I'm facing the FTP connection refused from text editor while accessing AIX server .It showing the messege "can't create ftp connection connectin refused".Though it is accessible from putty .
i'm using aix version 6 .
Can any one let me know the seetings needs to be made so that i... (2 Replies)
Discussion started by: rmkganesh
2 Replies
LEARN ABOUT CENTOS
ipa-replica-conncheck
ipa-replica-conncheck(1) IPA Manual Pages ipa-replica-conncheck(1)
NAME
ipa-replica-conncheck - Check a replica-master network connection before installation
SYNOPSIS
ipa-replica-conncheck [OPTION]...
DESCRIPTION
When an IPA replica is being installed a network connection between a replica machine and a replicated IPA master machine has to be pre-
pared for master-replica communication. In case of a flawed connection the installation may fail with inconvenient error messages. A common
connection problem is a misconfigured firewall with closed required port on a replica or master machine.
The connection is checked by running a set of tests from both master and replica machines. The program is incorporated to
ipa-replica-install(1) but can be also run separately.
OPTIONS
REPLICA MACHINE OPTIONS
This set of options is used when the connection check is run on a prepared IPA replica machine.
-m MASTER, --master=MASTER
Remote master machine address
-a, --auto-master-check
Automatically log in to master machine and execute the master machine part of the connection check. The following options for
replica part are only evaluated when this option is set
-r REALM, --realm=REALM
The Kerberos realm name for the IPA server
-k KDC, --kdc=KDC
KDC server address. Defaults t MASTER
-p PRINCIPAL, --principal=PRINCIPAL
Authorized Kerberos principal to use to log in to master machine. Defaults to admin
-w PASSWORD, --password=PASSWORD
Password for given principal. The password will be prompted interactively when this option is missing
MASTER MACHINE OPTIONS
This set of options is used when the connection check is run on a master machine against a running ipa-replica-conncheck(1) on a replica
machine.
-R REPLICA, --replica=REPLICA
Remote replica machine address
COMMON OPTIONS
-c, --check-ca
Include in a check also a set of dogtag connection requirements. Only needed when the master was installed with Dogtag 9 or lower.
-h HOSTNAME, --hostname=HOSTNAME
The hostname of this server (FQDN). By default a nodename from uname(2) is used
-d, --debug
Print debugging information
-q, --quiet
Output only errors
EXAMPLES
ipa-replica-conncheck -m master.example.com
Run a replica machine connection check against a remote master master.example.com. If the connection to the remote master machine is
successful the program will switch to listening mode and prompt for running the master machine part. The second part check the con-
nection from master to replica.
ipa-replica-conncheck -R replica.example.com
Run a master machine connection check part. This is either run automatically by replica part of the connection check program (when
-a option is set) or manually by the user. A running ipa-replica-conncheck(1) in a listening mode must be already running on a
replica machine.
ipa-replica-conncheck -m master.example.com -a -r EXAMPLE.COM -w password
Run a replica-master connection check. In case of a success switch to listening mode, automatically log to master.example.com in a
realm EXAMPLE.COM with a password password and run the second part of the connection check.
EXIT STATUS
0 if the connection check was successful
1 if an error occurred
SEE ALSO
ipa-replica-install(1)
IPA
Jun 2 2011 ipa-replica-conncheck(1)