Q: Mavericks network issue

etresoft wrote:

 

Magnetics wrote:

 

@etresoft - How can you say it has nothing to do with Mavericks (or either of the Lions) since a number of us did not have network issues prior to upgrading from Snow Leopard?

Because this is a yearly ritual now that Apple is going to yearly OS releases. ISPs hand out cheap routers that are tested only with Windows and whatever OS Apple was using 3 years ago. Ergo, if you use that router with a 3 year-old OS, you will get good results.

Well, All I can say is that I'm experiencing this issue when I am connected by ethernet to our LAN server box (Windows) or through the wireless router. All software/firmware is up to date for all devices and yet the problem persists. And since the the networking utilities in Mavericks are supposedly the same as the 2+ year old Lion OS, I would have to believe that the updates would have addressed this issue already.

For me at least, this is not just an internet or wifi issue. All network activity slows (Local or otherwise), hangs and then disconnects. Your advice to check out hardware/software outside of our computers is good advice. However, it is something I have done and do regularly and nothing has solved the issue.

Then you need to start your own thread and describe your problem and setup. Invariably, people who respond with "me too" and "I have the exact same problem" have a completely different situation. The last place you want your problem addressed is in someone else's rant thread. The more specifics you can provide, the better. That will also keep your thread from devolving into a rant thread and taken over by others with different problems.

etresoft wrote:

 

Then you need to start your own thread and describe your problem and setup. Invariably, people who respond with "me too" and "I have the exact same problem" have a completely different situation. The last place you want your problem addressed is in someone else's rant thread. The more specifics you can provide, the better. That will also keep your thread from devolving into a rant thread and taken over by others with different problems.

I thought about it, but I honestly don't think there is a solution for me outside of an OSX network utility update/patch since all devices outside of my computer are up to date and appear to be working properly. I have read through a number of Network Issue discussions (almost all with no solution) and I chose to post in this thread because it was close to the basic issues I was experienceing (10.6 to 10.9 upgrade, unreachable network/disconnects). The only change for me was the OS upgrade. Prior to that everything worked. My goal in posting here was just to add a little credence to the idea that there is possibly a Networking issue in Mavericks.

A colleague recommended the instructions on this page: http://blogs.citrix.com/2013/10/31/citrix-on-osx-10-9-mavericks/

Even though my issue has nothing to do with Citrix, I tried this and my VPN connection using Juniper Network Connect has been stable now for almost 4 hours, and that hasn't happened since I upgraded to Mavericks. If you don't want to go to that page, the instructions are:

  sudo su
touch /etc/sysctl.conf
echo net.link.ether.inet.arp_unicast_lim=0 >> /etc/sysctl.conf
chown root:wheel /etc/sysctl.conf
chmod 0644 /etc/sysctl.conf

and then reboot.

Unfortunately, I have to reply with a "me too".  I have been diagnosing this problem for weeks.  I have a feeling that this is a Maverick issue. 

I have a web application that sends a POST request to a backend every second.  It recently starts to fail because occasionally some of the POST request would fail.  I have made the following observations:

1. It is reproducible on OSX 10.9 and OSX 10.9.1 on all browsers
2. It is not reproduciable on OSX 10.8, Windows, and Linux running on the same network, wired and wireless.
3. The failure happens on the client side.  The XDR request simply cannot reach the host in one second, and in the following second, it is fine again.
4. Problem does not happen on localhost -- only to external host (in my case EC2).  Again, Windows, Linux, and OSX 10.8 have no problem.
5. I am able to reproduce this using direct IP address (to verify it is not DNS issue), and with/without IPv6

I am not sure how this is would be a router issue when it appears that this problem does not happen on other platforms, and other versions of OSX.

Unfortunately, this change to the ARP unicast setting did NOT fix the problem. After a few days, the symptoms returned.

rickfromlos altos wrote:

 

Unfortunately, I have to reply with a "me too".  I have been diagnosing this problem for weeks. 

Indeed it is unforunate. You have been having a problem for weeks and you report it in one of the few places on Apple Support Communities where you are guaranteed to have it ignored for weeks again.

Who do you want to read your post? Other people with networking problems who have decided to blame it on Mavericks? Or people who know networking?

I have a web application that sends a POST request to a backend every sec

I've read enough. Fix your web application. It is hopelessly broken. Different machines, browsers, OS versions, networks, all have different interactions with all of the different parts of the internet. I would expect such a web application to fail on a regular basis. What you call a Mavericks bug sounds to me like Mountain Lion bugs that have been fixed.

The internet is not reliable enough for HTTP requests once per second. Various OS vendors, especially Windows and Linux, try hard to hide such errors from the user. They are probably using more aggressive caching mechanisms to fake out your application. Windows, for example, requires a special, dummy parameter on each request to make it unique. Otherwise, it won't even bother sending it. Linux is always a different story because each Linux machine is unique.

Thanks a lot for sharing.  This solves my problem.

I have this exact problem. Since a few weeks back (which makes me doubt it was in 1.9.0, but maybe I was lucky) my mid 2009 Macbook Pro suddenly and regularly has its networking slow to a crawl, including completely stopping. It can either be waited out, or "fixed" temporarily by switching networking off/on or restarting.

It happens to the IP or TCP layer (haven't checked UDP) and it also happens to existing network connections. I always have a VNC session to another Mac on my local network active and thus I can be perfectly sure the symptom has nothing to do with routing (Airport Extreme), DNS lookups, general Internet connectivity or a specific protocol.

The problem can appear several times in a few hours, or more seldom. The low networking speed, before timing out completely, can be verified in the activity monitor.

/Troed

had this issue where my macbook pro and imac were able to connect to the internet but couldnt see each other on the wireless network.

In order to solve this i logged into my wireless router went to "LAN Administration" and added a static route to both my macbook and imac..

lets say u have 2 computers and these are their ip addresses: ( you can get these stats from system preferences 'network' - wifi - advanced - tcpip)

apple1 - 192.168.1.5 

subnet mask - 255.255.255.0

gateway - 192.168.1.1

apple2 - 192.168.1.6

subnet mask - 255.255.255.0

gateway - 192.168.1.1

so in my router i would add the static route like so:

IP=192.168.1.5     Mask=255.255.255.0   Gateway=192.168.1.1  metric=1  interfacetype = LAN

IP=192.168.1.6     Mask=255.255.255.0   Gateway=192.168.1.1  metric=1  interfacetype = LAN

now both my computers can see each other and share files.

That did it for me as well. I'm relieved there is finally a fix for this. More background info on this bug can be found on these pages:

• Different thread describing the problem and the solution:Mavericks and Failed ARP causing network drops!
• Detailed description of the underlying problem and fix: http://www.macstadium.com/blog/osx-10-9-mavericks-bugs/
• Related question on StackExchange with some diagnostics and my answer directing to the two links above: http://apple.stackexchange.com/a/160020/99523