Ethernet network troubleshooting

Use of Sniffer to take captures and interpret them

Hi Ravi,
You can use a sniffer like etherreal(whihc is most common) to monitor and capture the traces for some Lan related problems like boradcast traffic whihc could cause a hell lot of issue on your network.
When you use a sniffer, it will list the source and destination IP, protocol type like ARP,IP,TCP,UDP and also the kind of traffic broadcast,multicast etc. It will give whole L2 and L3 information for the source and destination hosts.
Please revert if have more questions.
regards,
-amit singh

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Wifi airport to surf and ethernet network access

Sorry if this question has been asked before but I have not found a solution anywhere yet.
Q: How do you set up the airport (wifi) to access the internet to surf the web; while connected to an ethernet network?
Background; this imac is set up at work and can access the public wifi to surf the internet as long as the ethernet cable is unplugged from the back, but to browse the network files and drives and check email to do work the ethernet cable must be plugged in. But its a pain to keep walking around to the back of the mac and plugging in and unplugging the cables.
There has to be a way to set safari to use the airport to access the internet and set mail to use the ethernet ports.
Thanks for the help!

The normal setup would be to an attach a wireless access point to the existing network. Then connect to that device wirelessly. So use something like an airport express. Connect the network cable that normally goes into your mac into the aiport express. Then connect your mac to the airport express wirelessly.

How do I set up ethernet network having attached a MoCA adaptor from cable inlet into modem? It seems I need a "self assigned IP"?

I live in an old apartment building with very thick walls, and have a miserably spotty wireless network. In hopes of creating an undisturbed ethernet network for my computer and various other gadgets, I purchased two ActionTec Moca adapters, and set it up as suggested in a helpful review on Amazon: put one MOCA adapter "upstream" to the cable modem. The incoming coax with the Internet signal would plug into the MOCA "in" port then the MOCA's "out" coax goes into the coax on the cable modem. Then the LAN port on this MOCA goes into a LAN port on the switch/router. The Ethernet port on the modem goes into the WAN port on the same router. This "triangle" of connections is confusing to someone who is not networking savvy because they assume that all network connections have to be linear." The adaptors light up as they are meant to, indicating that the signal is there, and my iMac tells me thatDiagnostics window tells me that the internet connection appears to be working correctly." Only the little button in the Network Diagnostics panel next to 'Network Settings" is yellow. When I run the Setup Assistant, it says that "You cannot connect to ISP automatically, so you need to enter information to set up your connection. Selec the appropriate item then enter the required information. If you don't kow the infromation, contact your ISP." I checked "I have a DHCP Client ID and entered my IP address as copied from the network panel. It said congratulations you are now connected to the internet!" But then no browser window window would open, and Safari said "you are no longer connected to the internet". What did I do wrong?

I wouldn't expect the oMoCa adaptors to issue IP numbers, simply act as a passthrough to get the connection to the modem. It's not clear how you've got this set up or how the Airport comes into it.
From what you say the modem has several ethernet outputs - is this correct? - then you are directly connect to it by cable; and possibly an Airport Extreme is also connected to it.
Unless you are connected to the Airport either by cable or wireless it doesn't come into your own connection, though other computers may be connected through it.
If all this is as I described the modem must issue the IP numers and the Airport must have 'Connection sharing' in the 'Internet' section (after clicking 'Manual setup) set to 'Off (bridge mode)'. Then it simply passes the IP numbers issued by the modem through to any computers connected through it.
If the modem has only one ethernet output socket then it will be connected to a router (either the Airport or something else) through which everything else is connected, and that router should be set to issue the IP numbers as the modem will simply pass through the IP number issued by the ISP.
Whatever set up you have, you can only have one device issuing IP numbers or problems will result.
Your own Mac should be set to 'obtain an IP number automatically' or 'Use DHCP' (the same thing, and don't use 'DHCP with manual address). The number you are issued with will be in the 'local use' range, probably beginning with 192, and is not the same as the IP number seen by the outside world.

Remote app and an ethernet network

I'll try to keep this simple.
Everything was working fine with 10.5.8, no longer with Snow Leopard.
I have an ethernet network connected to DSL.
Apple TV is hooked up via ethernet.
MacPro is hooked up via ethernet.
Airport Express is hooked up to ethernet and has a wireless WEP network for airtunes, etc.
Before the Snow Leopard I could:
1. Connect to my AppleTV with the Remote App with my iphone when connected to the Airport.
2. Connect to the iTunes Library on my MacPro with my iphone with the Remote App.
Now, unless I unplug the ethernet cable on the AppleTV I cannot connect with the Remote App. Also, cannot connect to the iTunes Library at all (the MacPro doesn't have Airport, but it never had.
Any ideas? Thanks!

Hi,
Firstly, how to you reach the server from Internet, via host name, public IP address or VPN?
If you need to remote to the server via host name, can you nslookup the host name and get the correct public IP address of it?
Do you install the AD DS role on the server? Please let us know if you need the active directory environment.
Thanks.
Jeremy Wu
TechNet Community Support

Unable To Print Over Ethernet Network on HP 6520 all in one

All computers are on windows 8.1. My question or issue is this: Prior to purchasing a Mediabridge wireless router, wireless-n broadband 300 mps router, I had a Zyxtel wireless access point router. I am both Ethernet and wireless. Prior to the Mediabridge I would network print to my HP printer both wireless (iPhone) and over an Ethernet network (PC's and Laptop).
There is an improvement in printing wirelessly on an iPhone. I cannot print over my Ethernet network any longer. I have to unplug my laptop prior to printing before my laptop can see the printer online. With my second PC in another room I am unable to print over the Ethernet network. The printers are installed, drivers and such, but as with the laptop, I would have to unplug the Ethernet cord to print.
My error messages are showing as cannot find printer or or my control panel printer devices show as offline. If I unplug my laptop I can see the printers online. However I don't want to have to take disconnect a second PC in another room to print.
Can you offer any suggestions. Do I need to plug my printer directly into the Mediabridge wireless router?
Nancy
This question was solved.
View Solution.

Hi Nancyh1030,
Thank you for visiting the HP Support Forums and Welcome. I have read your thread on your HP Photosmart 6520 Printer and getting the error and not printing. Here is a link to the HP Print and Scan Doctor. The HP Print and Scan Doctor will run a check on your system and connect the printer to same network as the computer. You do have to be connected to the same wireless as the printer to print to it. Unless you are using Eprint. If this does not help you contact Mediabridge.
Hope this helps.
Thanks.
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Connecting a HP laserjet 8500 to an ethernet network

Just purchased an aging HP Laserjet 8500, need to connect to an ethernet network. Any ideas? It doesn't have an ethernet port or a usb connection.

Sorry I didn't point out that I do have an external jetdirect 170x print server, but I cannot find for the love of god the correct cable to connect the printer to the jetdirect box. I bought a IEEE1284 Printer cable but this isn't the correct cable to connect the printer to the box, although PC World told me otherwise.

Wireless Printing to OfficeJet Pro 8600 Connected to Ethernet Network

We have an OfficeJet Pro 8600 that is connected to our home's Ethernet network and would like to print to it from devices such as laptops, phones, and tablets. Any attempt to turn the printer's wireless capabilities on results in a command to disconnect the Ethernet cable, which we would prefer not to do.
Is there any way to "have our cake and eat it too", retaining the Ethernet connection while having the ability to print wirelessly? While useful, HP's ePrint doesn't offer the direct-from-application convenience we desire.

Hi,
By the book, the following setup should work:
Please use the following manual to set them up:
http://h10032.www1.hp.com/ctg/Manual/c00389927.pdf
Regards.
BH
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Printing on a wireless and ethernet network

Just installed AEBS wireless network:
Comcast modem to AESB - to USB printer, and to hub.
iMac G5 and MacBook on wireless cards from AESB
iMac G4 ethernet to hub
HL LaserJet 5m ethernet to hub
wireless part was a snap, and all can print to USB printer
HP LaserJet can be seen by all, but no one can print to it.
LaserJet has an assigned IP 192.168.1.6 (can be seen on the test page). this is in the range that the AESB provides.
all units have internet access.
what am I missing?
I had a Netgear router/firewall in the place of the hub, but removed it and replaced it with the Asante hub because I thought there might be some conflicts with router and the AESB.
repaired permissions, currently getting a message "unable to get printer status (server-error-operation-not-supported)!"
just can't figure out what to do next.
printer had always been reliable on an ethernet network.
thanks for any help.
iMac G5 1.8 rev 1, MacBook Pro 2.13, iMac G4 17" Mac OS X (10.4.8) AEBS, Asante FriendlyNet dual speed hub FH205P, HP LaserJet 5m Ethernet Jet Direct J, Canon S900 USB

Thanks for the reply
PSU shows it as defaultt printer and "idle".
when I go to print a document, everything looks normal as the job is sent to the printer, but when I look at the printer. it shows connecting on port 631 until I get an error message.
can it be the port assignment that is wrong?
My Printer self test sheet shows that "AppleTalk is Ready"
the test sheet is where I founf the IP address after AEBS setup
by seeing the printer, I mean thet when the print dialogue box comes up, the printer is there.
actually, that is probably not quite true.
I "added" the printer, named by its assigned IP address.
In the AEBS setup, I changed the address convention to 192.168.1.XXX from the default.
no particular reason, other than to check the change of the assigned IP addresses for the network nodes.
I am able to ping the printer with no problems.
is the driver setup made in the Printer Setup Utility?
if so, how would I go about changing it and to what shall I change the driver to?
from the network Utility in the AppleTalk Statistics and error counts section: (don't know if this is relevant)
AppleTalk lookup has started ...
AppleTalk interface.............. en1
Network Number .................. 65422 (0xff8e)
Node ID ......................... 2 (0x2)
Current Zone .................... *
Bridge net ...................... 0 (0x0)
Bridge number ................... 0 (0x0)
DDP statistics:
Packets Transmitted ............. 49
Bytes Transmitted ............... 1741
Best Router Cache used (pkts) ... 0
Packets Received ................ 62
Bytes Received .................. 2179
Packets for unregistered socket . 0
Packets for out of range socket . 0
Length errors ................... 0
Checksum errors ................. 0
Packets dropped (no buffers) .... 0
AppleTalk lookup has completed ...
AppleTalk Information:
AppleTalk lookup has started ...
AppleTalk interface.............. en0
PRAM default zonename ........... *
PRAM netnumber .................. 65489 (0xffd1)
PRAM node id .................... 7 (0x7)
AppleTalk interface.............. en1
PRAM default zonename ........... *
PRAM netnumber .................. 65422 (0xff8e)
PRAM node id .................... 2 (0x2)
AppleTalk lookup has completed ...
there are NO appletalk zones
thanks again for your interest and help.
Mac OS X (10.4.8)

How many Standard Ethernet Network Interface by server ?

Hi
Huh... I'd like to install a RAC configuration with 2 server but i've a doubt.
When i list all network interfaces i've:
Server1
en0 Standard Ethernet Network Interface
et0 IEEE 802.3 Ethernet Network Interface
lo0 Loopback Network Interface
Server2
en0 Standard Ethernet Network Interface
et0 IEEE 802.3 Ethernet Network Interface
lo0 Loopback Network Interface
Is it good or not ? (probably not and documentation says that en0 and en1 must be present in the configuration). OK.
I'm under AIX 5.3 and by Smit i've an option intituled "Add a Virtual IP Address Interface". Is it possible to create the second Interface as a Virtual IP adress here ?
Thanks in advance
Regards
Den

Den,
Basically, you would be needing two separate interface cards for each participating node. The first one to connect to the public network and second for the use an interconnect. Not sure, if et0 is really an network interface, if yes, you should be ok.
VIP is nothing but an un-assigned IP address (in the same subnet as your public IP address) which is expected to be inactive before you install the CRS. This should be listed in your /etc/hosts file and/or dns server (if used). Not sure if adding VIP through the SMIT makes it active, if yes, then you might not want to use SMIT to set up the VIP.
This may help you with more information - http://download.oracle.com/docs/cd/B19306_01/install.102/b14201/preaix.htm#sthref378
HTH
Thanks
Chandra

Airport Express w/Ethernet Network

Hi all!
Is it possible to use the AX to connect to an ethernet network and stream audio? I've tried turning off the radio and using the bridge mode...the AX will appear in the Airport Utility for a couple of minutes, then disappear. I've also tried the roaming setup in a wireless configuration with the same result. The only configuration where I can maintain a connection with the utility is in join a wireless network mode.
Any suggestions?? Basically, I just want to use the ethernet network and avoid wireless.

Apple's instructions to "extend a wireless network" using wireless only are in the link below. Although the illustration pictures a 2nd AirPort Extreme, the setup for an AirPort Express is exactly the same.
http://support.apple.com/kb/HT4259
The Ethernet port is automatically enabled in this type of configuration to allow Ethernet devices to connect. If you need more than one Ethernet connection, you can add an Ethernet switch to the AirPort Express to create more connection capabilities.

How to merge wireless and ethernet networks?

I have a TC with one Mac connected through ethernet and the other Mac and iOS devices connecting through wireless. How can I merge the ethernet network and the wireless network so that I can share iTunes libraries between the 2 Macs? Thanks

Thanks for you help.
This would take care of the "normal" file sharing between the 2 Mac. But I'm trying to use the iTune feature called Home Sharing, which allow sharing music etc among familly computers that are on the same network, independantly (as far as I understand) of any file sharing set up in the Mac OS. However my experience so far is that the 2 Mac between which I want to apply this Home Sahring feature have to be on the same network. Indeed even if I only have a TC as my router, the 2 Mac have to be on the same wireless network (main or guest). Since one of my Mac is on the ethernet network and the other on the wireless (main) this does not seam to work. I feel that somehow this Home sharing feature looks for the name of the network and make sure that the 2 computers between which I'm trying to enable sharing use the same network (i.e. same name). However the ethernet network does not have a name....
For now, the solution is to have the ethernet wired Mac to also be connected on the wireless network. I'm just not sure how the OS is handeling the connection to 2 networks (hopefully giving priority to the faster/more reliable ethernet one).

Creating Wireless Network via existing Ethernet Network

Hello
I have a problem with setting up my network in my new place, where internet was already available via existing Ethernet network. I tired to solve the problem with the Designing Networks with Airport but I think my case is not described there. First of all let me describe how the Ethernet works. Network is setup by a Modem/router device that was supplied from the ISP, it is connected to the switch that divides the service over 4 different apartments, since it is a quite good connection there is no bandwidth problem, but the ISP device assigns only 5 IP addresses that can get internet service, everything above 5th IP is just an IP without Internet. From my basic knowledge I think that i need at least 4 IP to cover my needs. Time Capsule, Mac book, iTouch and my xbox. IF i set up my TC into a bridge mode it all works, but i am taking to much internet IP's and my neighbors are stuck with the IP's that don't allow them to connect to internet. What I need to know is a detailed instruction how to use one IP address from the 5 available, and using time capsule provide local IP to all of my devices at home so the rest of IPs generated by the ISP device will not be assigned to me.
I tired to set up the time capsule to option Share a public IP address, or static IP's option, but in both cases my devices fail to connect to internet, however they do have assigned IP's by the TC. I have a strange feeling there is a small detail I am missing that keeps me from a successful set up, but of course I might be wrong, because I am relatively new in Mac community and have only basic knowledge in network stuff.
I am sure that I was not the only one that has this problem so if there is another topic about this subject, which I have failed to find, I would appreciate a link. Thanks for help in advance, if any other info is required please don't hesitate to ask, hopefully I can solve my problem with Your help very soon.
Regards

+my Xobox fails to connect to xbox live claiming that I have NAT set as moderate (the NAT map porting is enabled) and I dont know what to do about that. I have googled a bit and there are some suggestions that my TC puts additional layer of NAT on top of my ISP modem/router and that's why it is confused.+
As William has pointed out, in your particular setup, there may be no way around the double layer of NAT. The Time Capsule must be set to "Share a single IP address" if you want to connect multiple devices.
Might be worth confirming that you really do have the additional NAT layer on your network.
Open Hard Drive > Applications > Utilities > Network Utility
Click on the Traceroute tab
Enter an address like "www.mac.com" (without the quotation marks) in the box
Click Trace
Let the trace run for a minute or two and then click Stop
Look at Line 2 only in the log.
If you see a 192.168 or 10.x.x.x address in this line, you have the additional NAT layer on your network.
If that's the case, I'm afraid that the only way to eliminate the NAT service on the Time Capsule is to place it in "bridge" mode. But, I understand that you have limited IP addresses to work with there.
Any way to have more IP addresses authorized for that location? That would appear to be the only solution if you want the Xbox to connect to Xbox live.

Error 36 when connecting to wired ethernet network

I'm trying to connect my new iMac to my existing wired ethernet network. The network has been functioning for some time with 2 PCs connected to a router which is connected to a cable modem.
I have added the iMac by connecting it to the router. I am able to get the iMac connected to the internet via this setup. The problem is when I try to connect to one of the PCs from the iMac I get error 36. I have tried all the server addreses I can think of. (smb://ip address of the PC/shared drive letter; smb://computer name/share drive letter). It works on it for a while then kicks out the error message. I have "pinged" the PC and it is connected. File sharing is enabled both on th iMac and the PC.
Apple support says this is a Windows problem and has left me high and dry even though this is supposed to be seamless.
Please help.

While waiting to be connected to a "product specialist" on Apple Tech Support I figured this out. First get the ip address for the PC you want to connect to by going to Start> Run>type cmd <enter>. Then type ipconfig <enter>. note "ip address". On the Mac Go>connect type smb://ip address for the PC click continue and you will get the sign on dialogue for the PC.
I am now happily copying my 4000 music files.

Migration to 802.1x for large scale Ethernet network

Hi all,
I have a very large wired-only Ethernet network which I would like to migrate to 802.1x for stronger authentication of end users. The problem I have is that there are long chains of legacy swtiches which do not support 802.1x (the topology of the network is a complete tree of switches). As far as I know, 802.1x is port based.
So here is the issue:
- the replacement of all switches will take a very long time, but I would like to have all end users authenticated asap
- switches supporting .1x will initially only be located at the roots of the tree. There will still be legacy switches not supporting .1x between end users and newer switches.
- authentication of users on a port of a new switch will be shared between several end users.
Do you know if it possible to enable authentication of all users but having only enabled 802.1x in some more central locations first?
Cheers,
Benoit

IEEE 802.1x Authentication
These are the IEEE 802.1x authentication configuration guidelines:
?When IEEE 802.1x authentication is enabled, ports are authenticated before any other Layer 2 or Layer 3 features are enabled.
?If you try to change the mode of an IEEE 802.1x-enabled port (for example, from access to trunk), an error message appears, and the port mode is not changed.
?If the VLAN to which an IEEE 802.1x-enabled port is assigned changes, this change is transparent and does not affect the switch. For example, this change occurs if a port is assigned to a RADIUS server-assigned VLAN and is then assigned to a different VLAN after re-authentication.
If the VLAN to which an IEEE 802.1x port is assigned to shut down, disabled, or removed, the port becomes unauthorized. For example, the port is unauthorized after the access VLAN to which a port is assigned shuts down or is removed.
Try these links:
http://www.cisco.com/en/US/products/hw/switches/ps5023/products_configuration_guide_chapter09186a00805a64d7.html#wp1025090
http://www.cisco.com/en/US/products/hw/switches/ps708/products_configuration_example09186a00801d11a4.shtml

HT3819 I have an intel iMac OS 10.6.8 with iTunes 11.0.2 and an Apple TV with software 5.2. Home sharing worked fine until I added a VoIP device to my wired ethernet network. Now Apple TV cannot recognize my computer. How can I reconfigure?

I have an intel iMac OS 10.6.8 with iTunes 11.0.2 and an Apple TV with software 5.2. Home sharing worked fine until I added a VoIP device to my wired ethernet network. Now Apple TV cannot recognize my computer. How can I reconfigure?

I have an intel iMac OS 10.6.8 with iTunes 11.0.2 and an Apple TV with software 5.2. Home sharing worked fine until I added a VoIP device to my wired ethernet network. Now Apple TV cannot recognize my computer. How can I reconfigure?

Ethernet network troubleshooting

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