Seeking a solution to optimize my network performance

Hi, I'm looking for a solution using ipfw/socat or any other combination of firewall/socket redirection to allow certain applications to access servers without Nagle's Algorithm (or net.inet.tcp.delayed_ack=0 set for just those ports) getting in the way of performance.
The problem I'm facing is with bad TCP ACK times artificially increasing the latency between the destination servers and my terminal. Pinging the server yields 180ms, while the application measures latency to be at 300ms and above.
I've found solutions using iptables and socat to attain the same kind of results creating a loopback with iptables and then using socat to forward those packets with "nodelay" to the destination server.
I am using an Alu Imac 24" with Leopard 10.5.1 installed.
Some other information:
x11/x11 SDK installed
Xcode installed
Macports installed
socat 1.4.2 installed
Any help is appreciated and thank you for your time.

Are the disks connected like this:
Intel SATA 6G port 1 Gray -                 240GB SSD for OS & Adobe
Intel SATA 3G port 3/4 Blue -               6tb RAID 0 (2x3tb 7200rpm) for footage
Marvell SATA 6G port E1 Navy Blue - 256GB SSD Exports drive
Intel SATA 6G port 2 Gray -                128GB SSD Cache/Media Cache/Previews
Have you followed the suggestions on Tweakers Page - Tuning Guide

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Seeking solution to optimize home network performance (TCP)

Hi, I'm looking for a solution using ipfw/socat or any other combination of firewall/socket redirection to allow certain applications to access servers without Nagle's Algorithm (or net.inet.tcp.delayed_ack=0 set for just those ports) getting in the way of performance. Setting delay_ack=0 globally usually kills the performance of all the web applications I use.
The problem I'm facing is with bad TCP ACK times artificially increasing the latency between the application's destination servers and my terminal. Pinging the server yields 180ms, while the application measures latency to be at 300ms and above.
I've found solutions using iptables and socat to attain the same kind of results creating a loopback with iptables and then using socat to forward those packets with "nodelay" to the destination server.
I am using an Alu Imac 24" with Leopard 10.5.1 installed.
Some other information:
x11/x11 SDK installed
Xcode installed
Macports installed
socat 1.4.2 installed
Any help is appreciated and thank you for your time.
PS: I posted this in the Leopard 10.5 forums w/o realising this subforum was here.

In a roaming network, your "main" router is the device that would require port mapping/forwarding to be configured in order to access the IP camera from the Internet. This router is also the one that would be provide the private IP address for the camera which you will want to be a static one.
So as you described your network, the IP cameras should be getting an IP address or you assigned it a static one and this is the address that you would enter in the Private IP address (or equivalent depending on the router used) field when setting up port mapping.
If you are not able to access this camera from the local network, then this should be troubleshot first.

Welcome to Solutions and Architectures Borderless Networks Community

Welcome to the Solutions and Architectures Borderless Networks Community. We encourage everyone to share their knowledge and start conversations related to Borderless Solutions and architectures. All topics are welcome, including Switches, Routers, Security, Wireless, Cloud and System Management, WAN Optimization and solutions to solve business problems.
Remember, just like in the workplace, be courteous to your fellow forum participants. Please refrain from using disparaging or obscene language or posting advertisements.
Cheers,
Dan Bruhn

Hi,
I have a question...
I going to install two Nexus 7009 with three N7K-F248XP-25 modules on each one, I am planning to create 3 VDC, but at the initial configuration the system does not show the ethernets ports of these modules, even with the show inventory and show module I can see tah the modules are recognized and its status is OK. There is something that I have to do before start to configure these modules...? enable some feature or license in order to see the ports with show running CLI...?

Xserve G5 Network Performance Questions.

Hello,
I have the latest 2.3Ghz Xserve G5 and was wondering what the optimal configuration would be for the best network performance. The unit seems to come with a couple of GB Ethernet interfaces but would a Fibre connection improve bandwidth at all? Currently this unit has direct access to a layer3 managed switch but is GB Ethernet more limiting than a fibre connection into the same switch and is a Fibre network connection possible on this unit?

Are you talking gigabit ethernet over fiber vs. gigabit ethernet over copper? Or Fiber Channel?
There's no significant difference between gigabit ethernet over fiber vs. over copper. There are some minor issues (such a a lower propagation delay in fiber vs. copper) but over short distances it's not relevant.
There are Fiber Channel cards available, but they're usually used for connectivity to storage systems (arrays, backup devices, etc.), not host-to-host connectivity.
Attaching a fiber channel storage array (such as the XServe RAID woul dhave a trickle-down effect on your network (there would be less overhead reading and writing data to disk therefore data can be pushed or pulled from the network more quickly), but it's not going to be a huge difference.
For maximum impact you could consider either trunking (combining multiple ethernet ports into a larger, virtual port) or moving to 10GbE (10 gigabit ethernet), although that will require new switches as well.
You might want to check out Small Tree, they're well versed in high performance networking and sell a range of multi-port gigabit ethernet cards as well as 10GbE solutions.

DMVPN - improve network performance

Hi All,
We have a dual hub dual dmvpn cloud network running EIGRP or about 50 and 100 sites in the coming future.
I have configured it in a way for 25 spokes to designate hub1 as primary and the other 25 spokes to designate hub2 as its primary link.
To load balance.
I need some help on sugguestion or recommendations on how to improve its network performance.
This is to anticipate queries by customer running systems&apps complaining why is the link too slow after implementing dmvpn
Is there any parameters that can be fine tuned to help increase its performance?
Please advise.
Thanks

Hello, I know this thread is old but it is exactly relevant to what i have now. We have implemented the dual hub dual dmvpn solution over the last year on our remote sites. The head ends are 7200s w/C7200P-ADVSECURITYK9-M, Version 12.4(24)T3 and the remotes are 1700s (slowly being replaced with 1800s) and 1800 series routers. there are about 60 sites, most of them riding over Comcast cable (preferred) or Verizon DSL. Many of our sites have both, where comcast is primary and DSL is secondary, so on these sites there are 4 tunnels. Our connections are getting very slow. For instance, at one site they have paid for 50mb cable connection, which, when plugged directly into the cable modem, reaches those speeds. When going through the tunnel back to our core, where we have mutiple GB ISP connections out to the internet, they are getting 2mb download speeds. Actually, they don't even have to be going out to the internet, just hitting our internal servers in the core is slow for them. We started testing multiple sites and it seems all of them are getting very slow compared to the service they have. In looking at the troubleshooting options available you listed above, I am very curious about making sure none of the devices are oversubscribed. Since we have no spoke to spoke connections I am assuming that this troublshooting should be done on the 7200s. What commands would be good to run to check for oversubscription on the 7200s regarding CPU and crypto accelerator? Also, when you mention QoS, where does this get applied? I am familar with manual QoS config for voice and video, but how does it relate to VPN? Is there anything else i can look at/modify that will help alleviate the slowness of these tunnels? Any help would be greatly appreciated!!
Thank you,
Noel

PC and Network Performance

Hello:
The City of Detroit is planning to upgrade to 11.03 or 11i. We are looking for network and PC performance minimums/maximums to support as a minimum 11i and any known future upgrades coming but not released. Is there a publication/white paper that would provide information, not only on the above, but would be the expected performance benchmarks for AP, AR, PO, GL, Projects & Grant HRMS, OTA, and FA? At the moment we are on 10.7 and interface with EMPAC. Users are spread over the City in numerous locations. We must assume that the user will have other non-Oracle apps open such as Office and GroupWise.
Thanks,
J
Gerald R J Heuer
313-224-2109
Beeper: 313-275-6714
F:313-224-9342
[email protected]
1232 Coleman A Young Municipal Center
2 Woodward Ave
Detroit MI 48226

The information is available in Appsnet under the 'Technology' Tab and you would need to look at some of the White Papers - including one with the name 'Nothing but Net' and the Network Performance Presentation.
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My 3G connection is not working after updating to iOS 6.1. I have tried all possible solutions like resetting the network, restarting the iPad

My 3G connection is not working after updating to iOS 6.1. I have tried all possible solutions like resetting the network , restarting iPad , ...

The same story. No 3G after updating to 6.1. Told my daughter temporarily not to do an update on her iPad with 6.01. We've exchanged SIMs. I inserted her SIM in my iPad - 3G appeared immediately. And my SIM in her iPad with ios 6.01 also WORKS FINE. We use the same provider - Megafon Moscow. After attempting to revert SIMs to original configuration, 3G disappeared on my iPad again. Don't know what's going on with SIM during the update to 6.1

Solaris 9, V210, bge0 network performance issue

Setup: Solaris 9, V210, single network (bge0).
ndd shows: 100FD
LAN Switch set to 100FD
Network performance bad, in fact very bad. System shows upwards of 19% collisions with netstat -- odd since FD should have no collisions. Network folks have checked switch settings and they are 100FD. I have checked more than once that ndd returns 100FD.
I am not sure what to check next. Thanks for any help you can provide in what to check next or pointing me to something I have missed.
Thanks - Wes

Means your system and the switch aren't playing nicely.
Anytime a Sun internal is showing collisions (don't care what ndd says), it means the interface is probably flip flopping between FD and HD (causing your collisions). The flip flops are causing performance to be MUCH worse then just the collisions ever would.
You might try a new factory made CAT5 network cable.
Then if that doesn't work, you should try using ndd to force the bge interface to 100FD and forcing the switch to 100FD.

Regarding Coherence Network Performance test?

Hi,
We have performed the datagram tests for two servers that we have using the coherence datagram test scripts.
We have shared the results that we got after a run of 60 – 65 seconds each for the unidirectional and bidirectional tests.
Please refer to
https://docs.google.com/spreadsheet/ccc?key=0Atn1ma-myp6ndEc0THBKRTFDSnBaN0NqV1o1Ym1jRnc#gid=0
for the results.But we want to understand from these results if this performance is under the agreeable range, for which we don’t have any absolute references with us.
Can someone suggest if this network performance is good enough or if there are any problems based on these statistics?
Quick help much appreciated. Thanks in advance.
Edited by: saiyansharwan on Jan 11, 2012 5:40 AM

Appreciate your response much. For your reference I am putitng the details on the excel sheet right on the reply.
For unidirectional test
=============
Test Parameters -
1     Buffersize     89 (Changed as exception occurred due to OS buffer size limitations)
2     Packet size     1468 (default size adopted)
3     Command on Server A     sh datagram-test.sh serverb
4     Command on Server B     sh datagram-test.sh -rxBufferSize 89 ( to limit the receive buffer size assumed by coherence to match with the actual value in the OS.)
Results:
Server A as publisher and Server B as listener
Publisher Details     Byte transfer rate for Server A     111 MB/sec
     Packet transfer rate for Server A     79550 packets/sec
Listener Details
Sl.No     Parameter     Server B values
1     elapsed     61547ms
2     packet size     1468 packets
3     throughput     111 MB/sec
          79614 packets/sec
4     received     4900000 of 4902366
5     missing     2366 packets
6     success rate     0.9995174
7     out of order     0
8     avg offset     0
9     gaps     802
10     avg gap size     2
11     avg gap time     0ms
12     avg ack time     -1.0E-6ms; acks 0
For Bidirectional test
============
Test Parameters -
Sl.No     Parameters     Values     Remarks
1     Buffersize     89     Changed as exception occurred due to OS buffer size limitations
2     Packet size     1468     default size adopted
3     Command on Server A     sh datagram-test.sh -polite serverb -rxBufferSize 89     started on polite mode to wait till it receives data
4     Command on Server B     sh datagram-test.sh servera -rxBufferSize 89
Results:
Publisher Details
     Byte transfer rate for Server A     114 MB/sec
     Packet transfer rate for Server A     81367 packets/sec
     Byte transfer rate for Server B     84 MB/sec
     Packet transfer rate for Server B     59768 packets/sec
Listener Details
Sl.No     Parameter          Server A               Server B
1     elapsed          65037ms               64932ms
2     packet size          1468 packets          1468 packets
3     throughput          107 MB/sec               65 MB/sec
               76618 packets/sec          46202 packets/sec
4     received          4982987 of 5050738          3000000 of 3001389
5     missing          67751 packets          1389 packets
6     success rate          0.9865859               0.9995372
7     out of order          0               0
8     avg offset          0               0
9     gaps          20097               119
10     avg gap size          3               11
11     avg gap time     0ms               0ms
12     avg ack time          1.149157ms; acks 309602     1.169717ms; acks 1017381
As you may observe, unlike the test you performed, bidirectional tests are showing much better success rate in this case.
But what I was looking for was some standards to compare against to decide if these statistics indicate good network performance.
Any suggestions?
Best Regards.

Sap solution manager optimizer configuration error

Dear Receipient
I have installed solution manager 4.0, patch is updated upto the level of optimizer configuration. I have configured sap router on the same solution manager machine.
now i am in solution manager optimizer configuration in that i am doing it with an user of having sap_all rights
in t code sm59 -> sap-oss connection test is good
now through t code solution_manager i have created an new active solution of sandbox land scape and through t code smsy i have created an logical component of sap ecc and i have added the user basis which iam using for soman optimizer configuration thru t code aisuser
but now if i go to t code solution_manager if i click on sandbox landscape -> change management -> support packs -> then click on maintenance optimizer it shows as no system
and also in product version also no available its showing
i dont know where i went wrong in my solman optimizer configuration
pls help me
regards
senthil

Hi,
Please follow the SAP Tutor to setup maintenance optimizer:
http://service.sap.com/solman-mopz
-> "SAP Tutor on Maintenance Optimizer " under the section
"Additional information on Maintenance Optimizer"
Best regards,
Warren

Network Performance Troubleshooting?

Greetings all,
I have a new Sun X4240 server installed as an enterprise backup media server and it's suffering terrible network performance to our new Exagrid disk storage backup appliance. The shares on the Exagrid are mounted as NFS3 shares on the server. If I cable the server directly to the Exagrid appliance, I get a reasonable 450-500 Mb/s on a simple copy from local disk to the NFS share. When I connect them back into our Cisco switch, the performance on the same copy drops to well under 20 Mb/s. A Windows server on the same switch sending traffic to CIFS shares on the Exagrid is performing quite well.
Does anyone have any ideas how to start troubleshooting this problem? Any other recommendations? Anything will be very welcome!
Sun X4240, Solaris 10 05/09 X64
Cisco Catalyst 4506, Supervisor II+ version 12.2(46), (cat4500-ipbasek9-mz.122-46.SG.bin)
WS-X4548-GB-RJ45 (48 port 10/100/1000BaseT module)
Many thanks,
Tim

I tried forcing the port settings but that still didn't work. In the end it turned out to be a problem with the code on the Cisco router. We tried a different, much cheaper Cisco router and it worked great.

X6450 network performance issue

We are seeing a network performance issue using the Blade 6000 chassis with two (10x 1 Gbps Ethernet) NEM modules. The x6450 blades in the chassis have Solaris 10 u7 installed. In our tests, we used two blades in the following manner: each blade had only one network interface connected (and plumbed in the OS level) and each blade was connected to a different NEM. Both blades were connected to the same gigabit switch. There were two other test systems (x2270-s) also connected to the same switch. We ran the following tests:
both the application client and server are on the same blade (i.e. application is using the loopback network interface): n operations/second (the number here is irrelevant, only the relation to other test numbers are relevant)
application client on first blade, server on second blade: 0.77 x n operations / second (i.e. 23% degradation)
application client on blade, server on x2270: 0.77 x n operations /second (i.e. 23% degradation)
application client on x2270, server on blade: 0.75 x n operations /second (i.e. 25% degradation)
We ran similar tests with the x2270. We did not see any difference between running the test on the loopback interface vs. running the test between two x2270-s.
Is there a known issue with these network modules or their drivers?
Edited by: kbertold on Jul 14, 2009 11:54 AM

Just use a high interval and you see how much throughput you have in that time
example: dlstat vnet1 120
Best regards,
Marcel

Windows 7 file copy and overall network performance

I have noticed some major problems with network performance when trying to access files stored on our NSS based file servers when using Windows 7 Pro.
Our file servers are OES2 SP1 and SLES 10 SP3. I did not have this type of problem when I was on Windows XP. I am currently using the Novell Client 2 SP1 on Windows 7. I did have the BSOD referring to the nccache.sys file. I read a TID that said to turn off file caching, but since doing that it is painfully slow.
Any help in advance will be greatly appreciated. If I should post this elsewhere please let me know as well. Thanks again.

Originally Posted by mrosen
On 27.01.2011 20:06, dshofkom33 wrote:
>
> Our file servers are OES2 SP1 and SLES 10 SP3.
I sure hope that's incorrect, as OES2SP1 runs on SLES10 SP2, not 3.
Also, you should really be running OES2 SP2 at aleast (SP3 just having
been released).
> I did not have this type
> of problem when I was on Windows XP. I am currently using the Novell
> Client 2 SP1
No IR5?
> on Windows 7. I did have the BSOD referring to the
> nccache.sys file. I read a TID that said to turn off file caching, but
> since doing that it is painfully slow.
Caching doesn't have any noticeable or even measurable performance
impact on more copying of files, as caching doesn't come into play here.
It can only have an effect on repeated activity on the same file, which
fily copying by design isn't.
> Any help in advance will be greatly appreciated. If I should post this
> elsewhere please let me know as well. Thanks again.
This would probably be better suited for the client forums, but you need
to post more information. Being "Painfully slow" isn't a technically
precise nor helpful description.
CU,
Massimo Rosen
Novell Product Support Forum Sysop
No emails please!
Untitled Document
You are correct with our Server installations. Sorry for the mistype.
As far as my client goes. I will try the IR5 client version to see if that is any better.
As far as being "Painfully slow" i mean it was taking hours to install a product from a .ISO hosted on one of our NSS mapped drives. It would take 15 minutes to copy a 3MB file wile the .ISO was installing. It took even longer to try to copy the file down. I had no problems with any of the forementioned when running on Windows XP SP3 with client 4.91 SP5. What other details do you need?

Full mesh VPN solution for on MPLS network with PE and CPEs

Hi,
We are trying to evaluate some best solution for Hub-Spoke mesh vpn solution in a MPLS network. The VPN hub router will be in PE router and all the VPN spoke will be in CPE.
Can someone please let us know what will be the best vpn solution, we understands that there will be some technical limitations going with GETVPN but still we did counld find any documenation for possiblity of using DMVPN.
How about the recent flexvpn, can fex-vpn work on this requirement, where can i get a design/configuration document.?
thanks in advance.

Hello,
GetVPN is intended for (ANY-to-ANY) type of VPN communication, over an MPLS network with Hub and Spoke Topology, your best Option is to look for Cisco (DMVPN) implementation where this type of VPN is primarily designed for Hub & Spoke.
Regards,
Mohamed

Hard drive and network performance

Can someone give me the intuitive, if not mathematic, side to where a hard drives performance becomes a bottleneck in network performance?
For example, say a given internal hard drive in a computer has a read/write of 40MB/s = 320Mbps. This is 1/3 the bandwidth of a gigabit ethernet cable, assuming everything works like it should.
So when you are downloading from your big RAID 5 file store on the gigabit network, to your local desktop (the hard drive that read/writes at 320Mbps), how do you ever utilize the full gigabit ethernet connection?
Just seems to me like the drive cache would be constantly full if you are downloading a large video file or such.
So what obvious thing am I missing?
Thanks

The simple answer is that you don't. At least not in this scenario.
As you've correctly surmised, the slower components are going to limit your throughput, but the disk speed is only one of several factors. Network latency, TCP/IP packet overhead and more will all contribute.
So you'll rarely get true gigabit throughput on file transfers. 300-400 mpbs on a gigabit ethernet connection is typical.
Where you can and do get more is on memory-based transfers - data in one systems's RAM (or cache) being copied to another system's RAM (or cache). That's why switches and routers can handle line-speed throughput - they get a packet on one interface and send it out another, never having to think about it again (oversimplified, of course).

Seeking a solution to optimize my network performance

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