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AIX server problem - network connection is unstable !


 
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Operating Systems AIX AIX server problem - network connection is unstable !
# 8  
Old 02-28-2020
Might want to look into getting your partition running in Power8 mode instead of Power7 compatibility mode. Also should think about getting off of AIX 6.1.

Have you check to see if there are any hardware problems or errors on the network interface?
# 9  
Old 03-02-2020
Quote:
Regarding your arp it looks fairly clear to me that you have a lot of devices on this ethernet segment.

When you have many devices on the same segment, sometimes packets will be delayed. That is now networking works.
On this ethernet segment we have many servers, but only these two servers got error, so I don't think this's the point.

Quote:
Might want to look into getting your partition running in Power8 mode instead of Power7 compatibility mode. Also should think about getting off of AIX 6.1.

Have you check to see if there are any hardware problems or errors on the network interface?
This could be a point - we installed AIX 6.1 on an IBM p8 server but we're not sure. Do you have any suggesions? The network and hardware devices is OK
# 10  
Old 03-02-2020
Quote:
Originally Posted by bobochacha29
On this ethernet segment we have many servers, but only these two servers got error, so I don't think this's the point.
A slight delay in a packet on a busy Ethernet segment is not "an error". That is how Ethernet works.

What you are "showing us' (an occasional 44 ms delay) is typical of all busy Ethernet segments with many devices.

44 ms is 44 one thousandths of a second. 44/1000 seconds.

The way in which you answer my questions shows you do not understand LAN networking and Ethernet (or networking in general).

Delays on an Ethernet segment are not "errors" and nor is it a sign of "instability". This his how the Ethernet (and indeed most networking protocols work) protocols works (queues, delays, priorities).

If you want guaranteed fast delivery between two hosts, you need to move them to their own Ethernet segment with only two devices on that network.

This is the only approach any experienced network engineer would take or advise.

Think about how Ethernet works. Every device wants to talk at the same time on the same wire. They cannot talk at the same time. The more devices, the more this happens. Each device will wait a random number of milliseconds to transmit when the network is busy. This is now LANs work. The more devices, the more a chance of a delay. So..... a 44ms delay (44/1000 of a second) occasionally on a busy LAN segment is normal.

As I mentioned to you, but you do not seem to want to understand, you want guaranteed fast delivery between two hosts on a LAN segment, you need to move them to their own Ethernet segment with only two devices on that physical networking segment.
# 11  
Old 03-02-2020
Reference:

Network delay - Wikipedia

Quote:
Network delay is an important design and performance characteristic of a computer network or telecommunications network. The delay of a network specifies how long it takes for a bit of data to travel across the network from one communication endpoint to another. It is typically measured in multiples or fractions of seconds. Delay may differ slightly, depending on the location of the specific pair of communicating endpoints. Engineers usually report both the maximum and average delay, and they divide the delay into several parts:

Processing delay - time it takes router to process the packet header
Queuing delay - time the packet spends in routing queues
Transmission delay - time it takes to push the packet's bits onto the link
Propagation delay - time for a signal to reach its destination
There is a certain minimum level of delay that will be experienced due to the time it takes to transmit a packet serially through a link. Onto this is added a more variable level of delay due to network congestion. IP network delays can range from just a few milliseconds to several hundred milliseconds.
Your occasional delay of 44ms is small and normal for Ethernets. In addition, each h/w device (LAN card for example) can have a different characteristic. The more devices on the LAN segment, the more of a chance for crosstalk, etc.

If you need better performance, all network engineers, not only me, will advise you to put the two devices on their own (dedicated) LAN segment. This is the only way to insure the LAN segment delay is minimal.

If you don't want to believe a network systems engineer with over 30 years IP and Internet-based networking experience (33+ to be more exact), maybe you will believe the myriad references on the Internet:

Networking 101: Primer on Latency and Bandwidth - High Performance
Browser Networking (O'Reilly)


(just one of hundreds / thousands of examples on the net which discuss this topic.)

In addition, ping does not measure latency nor does it measure round-trip time. It measures ICMP echo request response time. ICMP messages run with low priority and take longer than other traffic. This means that if any single host on your network is "talking" at the same time (cross talk), your ping packet will be delayed.

As I mentioned, 44 ms is not much delay. It is 44/1000 of second.

If you need faster times between two devices on the same LAN segment, the #1 solution is to move the devices to their own LAN segment.
# 12  
Old 03-02-2020
Also, this reference might be useful:

AIX server problem - network connection is unstable !-clsrvtrfjpg


REF:

https://www.lantronix.com/resources/...hing-tutorial/

You can easily see in the diagram that the way the LAN is configured is the key to client/server response time on a LAN segment.

Hence, when you showed us your arp configuration, it was easy to see you have many clients / hosts on a single LAN segment.
# 13  
Old 03-03-2020
Quote:
A slight delay in a packet on a busy Ethernet segment is not "an error". That is how Ethernet works.

What you are "showing us' (an occasional 44 ms delay) is typical of all busy Ethernet segments with many devices.

44 ms is 44 one thousandths of a second. 44/1000 seconds.

The way in which you answer my questions shows you do not understand LAN networking and Ethernet (or networking in general).

Delays on an Ethernet segment are not "errors" and nor is it a sign of "instability". This his how the Ethernet (and indeed most networking protocols work) protocols works (queues, delays, priorities).

If you want guaranteed fast delivery between two hosts, you need to move them to their own Ethernet segment with only two devices on that network.

This is the only approach any experienced network engineer would take or advise.

Think about how Ethernet works. Every device wants to talk at the same time on the same wire. They cannot talk at the same time. The more devices, the more this happens. Each device will wait a random number of milliseconds to transmit when the network is busy. This is now LANs work. The more devices, the more a chance of a delay. So..... a 44ms delay (44/1000 of a second) occasionally on a busy LAN segment is normal.

As I mentioned to you, but you do not seem to want to understand, you want guaranteed fast delivery between two hosts on a LAN segment, you need to move them to their own Ethernet segment with only two devices on that physical networking segment..
You're right. I hardly know about the networking, but some guys in network team told me that there's nothing wrong with the network devices, network configuration or something like that. They told me to focus on the server and OS. I have to agree with them because there're some servers which almost have the same network configuration with the two new servers, but have no problem like them

Code:
sysopr1@oltpn4c:/home/sysopr1>arp -a
  ? (10.0.91.1) at 0:1c:7f:64:16:f [ethernet] stored in bucket 1

  ? (10.0.10.26) at 88:94:71:c4:4a:49 [ethernet] stored in bucket 1

  ? (10.0.91.2) at 0:1c:7f:64:16:f [ethernet] stored in bucket 2

  ? (10.0.91.3) at 0:1c:7f:68:41:c3 [ethernet] stored in bucket 3

  ? (10.0.10.29) at 0:14:5e:b8:8a:6e [ethernet] stored in bucket 4

  ? (10.0.22.236) at 0:11:25:7b:17:e [ethernet] stored in bucket 5

  oltpn5h (10.0.91.162) at e4:1f:13:50:35:85 [ethernet] stored in bucket 13

  o6_mgt (10.0.10.38) at 0:1a:64:91:5:ff [ethernet] stored in bucket 13

  misn2h (10.0.91.164) at 0:1a:64:a7:37:68 [ethernet] stored in bucket 15

  ? (10.0.10.42) at 0:14:5e:b8:8a:79 [ethernet] stored in bucket 17

  oltpn10c-priv (10.0.21.66) at 6c:ae:8b:45:c4:90 [ethernet] stored in bucket 26

  ? (10.0.10.201) at 0:10:e0:3b:6b:4c [ethernet] stored in bucket 27

  m2def (10.0.19.135) at 0:1a:64:91:42:6e [ethernet] stored in bucket 30

  ihapp8 (10.0.91.180) at 0:1a:64:1e:ea:d8 [ethernet] stored in bucket 31

  ? (10.0.10.205) at 0:10:e0:35:dc:12 [ethernet] stored in bucket 31

  ? (10.0.10.206) at 0:10:e0:39:ef:c6 [ethernet] stored in bucket 32

  ihapp1 (10.0.91.181) at 0:14:5e:b8:88:cc [ethernet] stored in bucket 32

  ihapp2 (10.0.91.182) at 0:21:5e:8a:d2:f8 [ethernet] stored in bucket 33

  ? (10.0.10.207) at 0:10:e0:3a:35:14 [ethernet] stored in bucket 33

  ihapp3 (10.0.91.183) at 0:21:5e:8a:d5:18 [ethernet] stored in bucket 34

  ? (10.0.10.208) at 0:10:e0:39:ef:e4 [ethernet] stored in bucket 34

  ihapp4 (10.0.91.184) at 0:21:5e:8a:d3:6e [ethernet] stored in bucket 35

  ? (10.0.10.209) at 0:10:e0:3a:2e:b4 [ethernet] stored in bucket 35

  ihapp5 (10.0.91.185) at 0:14:5e:b8:88:dc [ethernet] stored in bucket 36

  ? (10.0.10.61) at 0:14:5e:b8:63:f8 [ethernet] stored in bucket 36

  ? (10.0.10.210) at 0:10:e0:39:ef:90 [ethernet] stored in bucket 36

  ihapp6 (10.0.91.186) at 0:14:5e:b8:87:e0 [ethernet] stored in bucket 37

  ? (10.0.10.211) at 0:10:e0:3a:2c:14 [ethernet] stored in bucket 37

  ih_ei (10.0.91.187) at 0:1a:64:1e:d0:f1 [ethernet] stored in bucket 38

  ic_tsm (10.0.10.63) at 0:1a:64:ad:4f:2a [ethernet] stored in bucket 38

  ? (10.0.91.188) at 0:14:5e:b8:87:6f [ethernet] stored in bucket 39

  ? (10.0.91.189) at 0:1a:64:1e:d0:f0 [ethernet] stored in bucket 40

  ? (10.0.10.70) at 8:9e:1:59:ff:3 [ethernet] stored in bucket 45

  ic_smgrr (10.0.91.50) at 0:1a:64:ad:50:a3 [ethernet] stored in bucket 50

  ? (10.0.10.75) at 70:20:84:fd:7e:8b [ethernet] stored in bucket 50

  ic_da (10.0.91.51) at 0:1a:64:ad:50:87 [ethernet] stored in bucket 51

  ? (10.0.91.202) at 0:21:5e:8a:d0:ae [ethernet] stored in bucket 53

  ? (10.0.91.203) at 0:21:5e:8a:d1:4a [ethernet] stored in bucket 54

  ? (10.0.10.229) at 0:10:e0:31:9b:44 [ethernet] stored in bucket 55

  ? (10.0.10.230) at 0:10:e0:2e:2a:70 [ethernet] stored in bucket 56

  ? (10.0.10.231) at 0:10:e0:31:ee:2c [ethernet] stored in bucket 57

  ? (10.0.10.232) at 0:10:e0:31:48:a6 [ethernet] stored in bucket 58

  oltpn10c (10.0.91.66) at 98:be:94:0:67:30 [ethernet] stored in bucket 66

  ? (10.0.10.92) at f0:de:f1:22:a4:13 [ethernet] stored in bucket 67

  o10gpfs (10.0.20.66) at 98:be:94:0:67:32 [ethernet] stored in bucket 68

  ? (10.0.10.253) at 0:1a:64:78:4a:9e [ethernet] stored in bucket 79

  ? (10.0.10.254) at 0:1a:64:95:5c:c2 [ethernet] stored in bucket 80

  icapp1 (10.0.91.81) at 0:1a:64:1e:a3:63 [ethernet] stored in bucket 81

  icapp2 (10.0.91.82) at 0:21:5e:8a:9c:a [ethernet] stored in bucket 82

  icapp3 (10.0.91.83) at 0:1a:64:91:40:f5 [ethernet] stored in bucket 83

  icapp4 (10.0.91.84) at 0:1a:64:91:38:3f [ethernet] stored in bucket 84

  icapp5 (10.0.91.85) at 0:14:5e:b8:89:53 [ethernet] stored in bucket 85

  icapp6 (10.0.91.86) at 0:14:5e:b8:8a:70 [ethernet] stored in bucket 86

  ic_ei (10.0.91.87) at 0:1a:64:1e:d0:21 [ethernet] stored in bucket 87

  ? (10.0.10.113) at 0:21:5e:8a:d0:20 [ethernet] stored in bucket 88

  ? (10.0.10.115) at 0:21:5e:8a:d2:8c [ethernet] stored in bucket 90

  ? (10.0.91.91) at 0:10:e0:3b:6b:4d [ethernet] stored in bucket 91

  ? (10.0.10.117) at 0:21:5e:8a:d0:16 [ethernet] stored in bucket 92

  ? (10.0.91.92) at 0:10:e0:3b:64:27 [ethernet] stored in bucket 92

  ? (10.0.91.93) at 0:10:e0:39:f6:3f [ethernet] stored in bucket 93

  ? (10.0.10.119) at 0:14:5e:b8:88:d1 [ethernet] stored in bucket 94

  ? (10.0.91.94) at 0:10:e0:3b:6f:85 [ethernet] stored in bucket 94

  oltpn5h-priv (10.0.21.137) at 0:14:5e:99:13:61 [ethernet] stored in bucket 97

  o6dg (10.0.22.38) at 0:11:25:7b:26:7e [ethernet] stored in bucket 105

  ? (10.0.10.135) at 0:1a:64:91:3c:c4 [ethernet] stored in bucket 110

  o5_mgt (10.0.10.137) at e4:1f:13:50:36:56 [ethernet] stored in bucket 112

  ? (10.0.10.2) at 0:1c:7f:64:16:f [ethernet] stored in bucket 126

  ? (10.0.10.170) at 8:9e:1:61:e9:5b [ethernet] stored in bucket 145

  oltpn6c-priv (10.0.21.38) at 0:11:25:7b:22:a3 [ethernet] stored in bucket 147

bucket:    0     contains:    0 entries
bucket:    1     contains:    2 entries
bucket:    2     contains:    1 entries
bucket:    3     contains:    1 entries
bucket:    4     contains:    1 entries
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bucket:   36     contains:    3 entries
bucket:   37     contains:    2 entries
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bucket:   39     contains:    1 entries
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bucket:   68     contains:    1 entries
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bucket:   85     contains:    1 entries
bucket:   86     contains:    1 entries
bucket:   87     contains:    1 entries
bucket:   88     contains:    1 entries
bucket:   89     contains:    0 entries
bucket:   90     contains:    1 entries
bucket:   91     contains:    1 entries
bucket:   92     contains:    2 entries
bucket:   93     contains:    1 entries
bucket:   94     contains:    2 entries
bucket:   95     contains:    0 entries
bucket:   96     contains:    0 entries
bucket:   97     contains:    1 entries
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bucket:  146     contains:    0 entries
bucket:  147     contains:    1 entries
bucket:  148     contains:    0 entries

There are 69 entries in the arp table.[/QUOTE]

[QUOTE]PING oltpn4c: (10.0.91.62): 56 data bytes
64 bytes from 10.0.91.62: icmp_seq=0 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=1 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=2 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=3 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=4 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=5 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=6 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=7 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=8 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=9 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=10 ttl=255 time=1 ms
64 bytes from 10.0.91.62: icmp_seq=11 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=12 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=13 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=14 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=15 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=16 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=17 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=18 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=19 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=20 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=21 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=22 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=23 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=24 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=25 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=26 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=27 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=28 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=29 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=30 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=31 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=32 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=33 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=34 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=35 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=36 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=37 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=38 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=39 ttl=255 time=0 ms
64 bytes from 10.0.91.62: icmp_seq=40 ttl=255 time=0 ms

And it's a misunderstanding that I don't belive you. It's just a complicated case, and I don't have enough knowledge to solve it .
# 14  
Old 03-04-2020
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.
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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

7. Solaris

Server unexpectedly closed network connection error in passwordless in ssh through

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

8. Cybersecurity

Enable SSH for root over certain network connection of a server...is it possible?

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

9. UNIX for Dummies Questions & Answers

Network connection problem in unix

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

10. UNIX for Dummies Questions & Answers

FTP connection problem on new server

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

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