Various Network Questions

Hey all,
If anyone saw my last post, and is curious what's happening with me, my school's IT department essentially told me to "proove it" (which is how support personnal should work, right?), which is what I'm now trying to do.
Regardless, I have a few questions/issues for anyone:
1) I can't seem to ping ANYTHING (except myself and my school's domain) without receiving a 100% packet loss. Is this because I'm behind the network? That's just a guess on my part, I could always ping outside domains back on my home network, but here I can't ping anything. It boggles my mind! Any other possible causes? I'm still connected to the internet, no doubt.
2) Is it possible to see a netstat that shows the port connections? I'm using the Network Util. right now, for simplicity, but the terminal isn't a problem for me.
3) Is it possible to do a traceroute from behind a big network, such as my college campus's? So far, I have failed. Perhaps this is related to #1....
Thanks in advance!

>1) I can't seem to ping ANYTHING (except myself and my school's domain) without receiving a 100% packet loss. Is this because I'm behind the network? That's just a guess on my part, I could always ping outside domains back on my home network, but here I can't ping anything. It boggles my mind! Any other possible causes? I'm still connected to the internet, no doubt.
There is a multitude of reasons why you can't ping. If you're on a private network you don't have a direct connection to the internet, and whatever you talk through might not pass ping packets. This could be a proxy, a router, a firewall or any number of other devices.
In short, a lack of ping response does not necessarily indicate a lack of connectivity.
>2) Is it possible to see a netstat that shows the port connections? I'm using the Network Util. right now, for simplicity, but the terminal isn't a problem for me.
netstat -a will show a list of all active connections on your machine.
3) Is it possible to do a traceroute from behind a big network, such as my college campus's? So far, I have failed. Perhaps this is related to #1....
This is almost certainly related to #1. If you can't ping through your network edge it's likely you can't traceroute, either.

Similar Messages

Testing of Java applications over various networks?

Hi,
If we write an application in java and lets say it works on a device running on GPRS network. How would we know if it would run fine over CDMA, CDG, WCDMA or other networks?
Regards,
Mansoor Chatha
SQA assosiate,
Research In Motion
[email protected]

There are emulators that allow you to test your J2ME application on various devices, however the emulators do not emulate the network topology of those device, bur rather simply redirect the network calls to the pc's local tcpip stack.
In order to effectively test your applications on various network enviroments you would physically have to load and run your app on a device connected to such an enviroment.
Hope this helps.

I bought the iPad 4 of America through the Apple Store of almost a month, and I am now in Egypt, and went to Tradeline company in Egypt, and said in an error made, and they do not do anything, what can I do. (Find Permanent telephone network) QUESTION:

I bought the iPad 4 of America through the Apple Store of almost a month, and I am now in Egypt, and went to Tradeline company in Egypt, and said in an error made, and they do not do anything, what can I do.
(Find Permanent telephone network)
QUESTION: -
1 / What to do
2 / Can you switch the iPad in Egypt (Tradeline)
3 / Can you switch the iPad in the Apple Store is located in the countries of the world, and what these countries.
* I do not speak English

Switching an iTunes Store account to a different country
http://www.ilounge.com/index.php/articles/comments/switching-an-itunes-store-acc ount-to-a-different-country/
iOS: How to change the language when it’s set to one you don’t understand
http://support.apple.com/kb/HT2371
iTunes: Changing the display language
http://support.apple.com/kb/ht2242
iOS: Using international keyboards
http://support.apple.com/kb/HT4509
 Cheers, Tom

Hey Everyone... I have a networking Question...

Ok well its more then just one networking question...
I'm working on a game engine (2d) and for the time being it just has two blocks in a 600 by 480 area, both controled by user input on a single comp. I would like to change this so that i can have the blocks be controled by sepeart computers. I know this is possible I just dont know how, any help would be great.
My experience with Java is some what limited i've only been programing for the past 6 months and i've never messed with any network code before.
Any and all help would be great
Thanks
Mike

Boy, that other poster was really helpful, yes? :-P
What you probably want to do is open a "socket" between one computer and the other. (TCP is probably the easiest/best for your application, as opposed to UDP). This is actually pretty simple, and basically consists of:
(this client/server arrangement is the easiest. Peer-to-peer would work too, but is generally more complex.)
1. Computer A decides to become the server and opens a java.net.ServerSocket on port 1234.
2. Computer B opens a java.net.Socket to computer A's port 1234.
3. Computer A accepts the connection and gets a java.net.Socket from the ServerSocket.
4. Now anything computer A writes to the Socket is recieved by computer B, and vice-versa. This is a TCP connection and is stream-based, so it should be familiar if you've done any Java I/O before; in face, you can use java.io.Reader's and Writers, and so on with your Socket.
See http://java.sun.com/docs/books/tutorial/networking/sockets/ for a good introduction to sockets.

How do I cut and paste sets of lines for use in various Math questions?

How do I cut and paste sets of lines for use in various Math questions?

Thank you for your reply. My problem is much simpler than you are thinking. As a teacher I prepare sheets with random number generators.
EG. 256 + 389= ______    or         467
                                             - 384
       469 + 753= ______
or 5)750
On a PC I was able to start a page of A4 with one set and then drag and drop down and across the page.
On my Macbook I can get the numbers in but the lines do not copy. I asked at one of my One to One sessions and it had my 'trainer' stumped. He said he would make enquiries but so far no news. I am using Numbers.
I hope I have explained my 'problem' satisfactorily.

Share files in ibook - networking question

Hello, I have a networking question.
I have a brand spakin' new 13' MacBook Pro and an older 14' iBook G4 (with a broken airport wireless card).
My internet is set up so that I have the modem connected to a "wired" ethernet hub, then to an airport express. This way I have wireless for my new MacBook Pro, and I can connect my old iBook to the internet with a ethernet cable.
Herein lies my question: I want to access all my files on my ibook from my MacBook Pro. I've tried the file sharing and etc on system preferences, but for some reason it still doesn't work. I believe its because they are on different networks? (one wireless, one wired?)
Any ideas to make my ibook a simple file server.

Try repairing disk permissions.
*"The external HD has two partitions, one is a backup of the ibook, and the other has mixed media. When I access my ibook over the network, Only the backup partition appears, and not the mixed media partition. "* Try repairing permissions but not sure if that's going to work. Can't hurt to try.
Launch Disk Utility. Select MacintoshHD in the panel on the left, select the FirstAid tab. Click: Repair Disk Permissions. When it's finished from the Menu Bar, Quit Disk Utility and restart your Mac.
Also, your profile indicates you are running 10.4.3. If that is the case, you might want to run Software Updates (from the Apple Menu , then click Software Updates.
Message was edited by: Carolyn Samit

Small office network questions

I have a small office with 4-5 mac computers. I have a Mac mini set up as a file server and I use a standard cable connection for my internet service. I use a wired router (ethernet cables) all going to a netgear switch.
Just bought a mac mini and a drobo storage device. I have successfully set up the drobo on the mac mini and I can "see" the files and read & write to the external drive. I also have a few other people in the office -- which will need access to the drobo via the network, but have a few questions there:
1. I don't see the name of the other computers that can connect to the unit. When I get on one of the other machines and look for the drobo I can find it & edit files but from the mac-mini side, I can't see the proper name of the other computer. How do I do this?
2. Can I limit which folders are accessible within the drobo that attached to the mac mini
3. Am I missing anything from a safety standpoint? Can Anyone come into my office and access the files that are on the mac/mini drobo? Worse off, is the mac mini vulnerable to the outside world with this setup?
Thanks for the help, new to all this networking stuff.

It's been a week, so i don't know if you have already worked this out, but...
while I am not familiar with your router, when I have used linksys before, i find it better to use static IP addresses for everything. Try setting static IP addresses and make sure everyone's mask is 255.255.255.0. Some routers also have a flag to allow computers to see each other.
Best of luck.

Cisco ASA 5505 VPN Routing/Networking Question

I have a very basic question about Cisco ASA 5505 IPsec Site to Site VPNs. I want to install a Cisco ASA 5505 at a Data Center, in a LAN subnet that utilizes publicly routable IP addresses. I would like to install a second Cisco ASA 5505 in a remote branch office as its peer.
Regardless of whether I use publicly routable IPs at the branch office in the "inside" network or non-routable IPs, how would the devices and servers at the Data Center know to route IP packets destined for the branch office back through the Cisco ASA instead of through the default gateway at the Data Center? I can see accomplishing this if every single device at the Data Center is configured with routing table entries, but that isn't feasible. It also isn't feasible to use the Cisco ASA 5505 as the default gateway for all of the devices as the Data Center, allowing it to decide where the traffic should go.
What am I missing? Is the solution to try to map branch office IPs to IP addresses within the Data Center's LAN subnet so that all of the traffic is on the same subnet?

You can do it in several different ways.
One way is to tell the server that if it has traffic to network x then it needs to go to the ASA all other traffic is to head for the default gateway.
In windows this is done via the route command
do not forget to make it "persistent" otherwise the route will disapear when your reboot the server.
in unix/linux
It is also the route command
Or you can tell your "default gateway" to route that network to the ASA
Good luck
HTH

Apple remote and multiple Apple TV's on same network question

I have 1st gen apple TV, Want to add 2nd gen apple tv. I assume I can do that. My real question is when using apple remote, can I control both Apple TVs independently?
Anyone have any knowledge of if this will work or not?

Welcome to the Apple Community.
If you are talking about the supplied remote, as Rudegar suggests you can pair each remote with each device so that only that remote will control the device it's paired with.
To pair a remote with a device hold down the menu and FF buttons together for six seconds or until you see a chain icon on screen. However it's not all that common for the TV's to be in different locations where an unpaired remote is unlikely to control both Apple TV's together. If you leave the remotes unpaired you should be able to use either remote with either Apple TV.
Alternatively if you are talking about the remote App for the iPhone, iPad or iPod, each Apple TV will show up as a separate device and you can control any Apple TV on your network from anywhere in your home.

Can you help me with an OS 9 OSX Networking question?

Hi, I'm hoping that this would be the right forum for this question.
Deal is this... I have an entire archive of material on a Beige G3 with
OS 8.6 - much of the material in files and so forth require staying in
that Legacy environment to access stuff that can only be retrieved on
older Native OS 8.6/9 apps.
Is there a way, that I can access this computer from an OSX machine via a
network? I know this may be a radical cross-platform situation but it
would eliminate alot of headaches if i could figure out a way to create
either a Remote Desktop, or Networked set-up where I can access the OS 8.6
machine from one of our OSX (10.4.11) laptops or desktops.
Any advice on the simplest/easiest way to set this up? The networks do all
share a router for internet access, so they are physically connected via
ethernet - that much is in place. If anyone's got a primer on how to make
this configuration happen on the older machine, I'd be most grateful as I
need to get a bunch of stuff off of there for a project and am currently
having to shuttle things via old SCSI-port zip drives to a newer machine...
(The Beige doesn't recognize USB or FW PCI cards -tho i have em installed...)
THANK YOU!
Mike

Hi, I understand what you mean. The Shareway app as i understand it, is only designed to run on the older OS as the 'host' - per se. When I tried entering the "remote" computers' username/pw on it, it did not recognize it. Is there a version of Shareway that would go on the newer OSX computer? In any event, I was able to get an OSX machine to read the OS 8 machine - by using the IP Server address entry and the "Connect to Server" option for File Sharing from OSX to OS 8/9.... Problem I now have is, as per other post - i wanted to simply open Filemaker on the older OS 8.6 machine from a newer machine to enter some data.
When I try that, the message is that A) I must have a newer FM version on my OSX
machine to open that app - and B) it will convert the file on the OLDER machine
to the NEWER machine's FM version - which isn't the goal as i still want to maintain my FM 4.1 database as an OS 8.6 file for when I am logging in on that machine.
Doesn't seem it should have to be this complicated eh? Arrgh.
Isn't there just a way to access and open docs on an 8.6 machine from another computer and perform tasks/functions "as if" i were logged into OS 8.6 -- would
that be Remote Desktop? Can i run THAT from OSX to OS 8.6 ?
Thanks!
Mike

Network questions/concerns... please help

Hi, I need some networking help/advice. My neighbor asked if she can use my wifi to stream tv/movies only. I couldn't say no because I felt bad and didn't want to say i didnt trust them. So I hooked up a Netgear router for the wifi while connecting my gaming systems by ethernet to my modem… I tested the wifi from the Netgear system and it seemed to be working. I stepped a way for a while and decided to check it again & was able to connect to the NETGEAR but not the internet anymore….. I know I made no changes but couldn’t find the problem until i ran the network diagnostics on my MacBook…. it created a diagnostic log and suddenly repaired the connection. Is it possible the neighbor was trying to access my local network and caused problems to the wifi?… how do I find something like this and is there a way to give her access without exposing any of my devices?… and is the way i’ve chosen to do it even protecting at all??….

You have posted your question in a forum and section devoted to Apple and in particular to the MacBook Air. You may get an answer here -- but you may want to consider posting it somewhere that dedicated to networking issues where it may attract an answer from people with more expertise and interest in that type of issue. One example is http://forums.anandtech.com/forumdisplay.php?f=12

Network Questions on 2012 R2 Hyper-V Cluster

I am going through the setup and configuration of a clustered Windows Server 2012 R2 Hyper-V host.
I’ve followed as much documentation as I can find, and the Cluster Validation is passing with flying colors, but I have three questions about the networking setup.
Here’s an overview as well as a diagram of our configuration:
We are running two Server 2012 R2 nodes on a Dell VRTX Blade Chassis.
We have 4-dual port 10 GBe Intel NICS installed in the VRTX Chassis.
We have two Netgear 12-Port 10 GBe switches, both uplinked to our network backbone switch.
Here’s what I’ve done on each 2012 R2 node:
-Created a NIC team using two 10GBe ports from separate physical cards in the blade chassis.
-Created a Virtual Switch using this team called “Cluster Switch” with “ManagementOS” specified.
-Created 3 virtual Nics that connect to this “Cluster Switch”:
Mangement (10.1.10.x), Cluster (172.16.1.x), Live Migration (172.16.2.x)
-Set up VLAN ID 200 on the Cluster NIC using Powershell.
-Set Bandwidth Weight on each of the 3 NICS. Mangement has 5, Cluster has 40, Live Migration has 20.
-Set a Default Minimum Bandwidth for the switch at 35 (for the VM traffic.)
-Created two virtual switches for iSCSI both with
“-AllowManagementOS $false” specified.
-Each of these switches is using a 10GBe port from separate physical cards in the blade chassis.
-Created a virtual NIC for each of the virtual switches:
ISCSI1 (172.16.3.x) and ISCSI2 (172.16.4.x)
Here’s what I’ve done on the Netgear 10GB switches:
-Created a LAG using two ports on each switch to connect them together.
-Currently, I have no traffic going across the LAG as I’m not sure how I should configure it.
-Spread out the network connections over each Netgear switch so traffic from the virtual switch “Cluster Switch” on each node is connected to both Netgear 10 GB switches.
-Connected each virtual iSCSI switch from each node to its own port on each Netgear switch.
First Question: As I mentioned, the cluster validation wizard thinks everything is great.
But what about the traffic the Host and Guest VMs use to communicate with the rest of the corporate network?
That traffic is on the same subnet as the Management NIC.
Should the Management traffic be on that same corporate subnet, or should it be on its own subnet?
If Management is on its own subnet, then how do I manage the cluster from the corporate network?
I feel like I’m missing something simple here.
Second Question: Do I even need to implement VLANS in this configuration?
Since everything is on its own subnet, I don’t see the need.
Third Question: I’m confused how the LAG will work between the two 10 Gbe switches when both have separate uplinks to the backbone switch.
I see diagrams that show this setup, but I’m not sure how to achieve it without causing a loop.
Thanks!

"First Question: As I mentioned, the cluster validation wizard thinks everything is great.
But what about the traffic the Host and Guest VMs use to communicate with the rest of the corporate network?
That traffic is on the same subnet as the Management NIC.
Should the Management traffic be on that same corporate subnet, or should it be on its own subnet?
If Management is on its own subnet, then how do I manage the cluster from the corporate network?
I feel like I’m missing something simple here."
This is an operational question, not a technical question. You can have all VM and management traffic on the same network if you want. If you want to isolate the two, you can do that, too. Generally, recommended
practice is to create separate networks for host management and VM access, but it is not a strict requirement.
"Second Question: Do I even need to implement VLANS in this configuration?
Since everything is on its own subnet, I don’t see the need."
No, you don't need VLANs if separation by IP subnet is sufficient. VLANs provide a level of security against snooping that simple subnet isolation provides. Again, up to you as to how you want to configure things.
I've done it both ways, and it works both ways.
"Third Question: I’m confused how the LAG will work between the two 10 Gbe switches when both have separate uplinks to the backbone switch.
I see diagrams that show this setup, but I’m not sure how to achieve it without causing a loop."
This is pretty much outside the bounds of a clustering question. You might want to take network configuration questions to a networking forum. Or, you may want to talk with Netgear specialist. Different networking
vendors can accomplish this in different ways.
.:|:.:|:. tim

Advice for Building Small Network Question

Hello,
I am building a small network environment which will connect to a larger office, scalability is important. We will begin having about 30 users which will all need VOIP services. The VOIP services will be hosted by a cloud provider. My question is as of now I am looking to obtain a Cisco 2921 ISR Router and then a Cisco 2960-X 48Gig POE, and my main question is I am confident the switch can handle the power and operation of the phones but just to make sure I should not run into any problems with the router as far as forwarding the data, correct? Any other comments or suggestions would be appreciated.
Thanks,
Joe

Duplicate post.
Go HERE.

Windows Clustering Networks question...

Hi all;
This is my scenario:
I have installed Windows Server 2012 on two servers. Then enabled Windows Clustering feature on it. The shared storage is based on Fibre Channel technology. Each server has 4 NICs and I have splitted them as followis:
One NIC for remote mangement of the servers with the range of 172.16.105.0/24.
One NIC dedicated for heartbeat communication.
Two NICs has been bundled together with NIC Teaming feature of the operating system.
But as you see in the following figure there are 4 Cluster Network links:
Is it normal?
Thanks
Please VOTE as HELPFUL if the post helps you and remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading
the thread.

Hi,
Just want to confirm the current situations.
Please feel free to let us know if you need further assistance.
Regards.
We
are trying to better understand customer views on social support experience, so your participation in this
interview project would be greatly appreciated if you have time.
Thanks for helping make community forums a great place.

Some very "newbie" networking questions -- trying to get started

Hello all. Since this forum is so friendly for issues related to Arch, I thought I'd post my semi-arch related question.
I'm trying to create a network for my house, consisting of about 3 computers. I have a book reference, TCP/IP Network Administration from O'reilly, but I think I need a bit of a "kick-start" in order to get to a level in which I can comfortably understand the book (if that makes sense).
I've got internet access working by connecting to a router and having everything configured by DHCP (ie, in rc.conf, eth0="dhcp"). What's bothering me (and I don't even know if it should) is that the other computers on the physical network are not visible to me.
IE, when I try to connect to them with their host name, it doesn't recognise them. My understanding of that is that either I need to manually set the hostnames of the other computers on the network in /etc/hosts, or use something like a DNS server on one of the computers in the network in order to recognize the others.
My other doubt is that I think I've got a dynamic IP address (though it might be static, I'm not quite sure). Does that change things?
I don't expect you guys to completely run through me setting up the network (that's what the book is for!) but some basic advice on either my misconceptions (I'm sure I have plenty) or related in general to my situation would be awsome and highly appreciated. I'd also be happy to provide any additional info that would be helpful.
Thanks in advance.

ralvez wrote:
My set up is simple.
I have a Linux router running on an old Pentium machine. It has two cards, one configured for the private network (with an address like 192.168.1.1) and the second card set up to take addresses from DHCP ( since that's how Rogers sends you the public address).
In that machine I run my firewall, SmoothWall (smoothwall.org) and have enabled NAT so the machines in the inside network can go to the Internet.
I have Samba set up in another machine to share files (that's an Arch system) with static IP, my daughter's machine (another Arch system), my system (obviously another Arch with static IP) and my wife's machine with Windows XP system (static IP too).
So, the key concept here are:
1. Use static IPs for the private network
2. Use DHCP for Rogers
3. Use NAT in your router so all the machines can go to the Internet but no one from the Internet can get to them.
Hope this helps.
R
p.s. feel free to contact me off the list if you need further details/help.
Aha! So, for example, the network 192.168.0.0 where mask is 255.255.255.0 is a private network set up by my router, right?
So the addresses in 192.168.0.0 never change, but the public IP address of the hosts do change?
Does that mean that if, for example, I have a host called 192.168.0.32 that its address never changes? Can I simply add that to all the other hosts' /etc/hosts file and it won't change?
All I was ever concerned about was allowing hosts in the network to contact each other via hostname. If that never changes then I'm all set.
BTW, thanks for your continuing help!
Last edited by Jessehk (2007-08-10 16:33:57)

Various Network Questions

Similar Messages

Maybe you are looking for