Catalyst 2948-GE-TX crossover cable issue

I am sure this is simple but I am not familiar with CISCO switch setups.
I am using this switch as a central switch for a 24 computer lab with a server. I want to connect it to our network using an exisiting wall jack. I have all my systems connected to the switch and finally added a crossover cable. Unfortunately, I have had no luck in getting it to let traffic in/out. Cannot ping the gateway from a machine inside the switch. I used a crossover cable into Port 1 with a wiring pattern as Gr/W - Gr - Or/W - Bl - Bl/W - Or - Br/W - Br on the switch end and a regular straitthrough end on the wall jack end.
Do I need to log into the switch and make conifiguration changes for port 1 or should it just work?
Thanks.

Hello,
which switch (e.g. Cisco 2950) and which IOS or CatOS version are you running ? Some of the newer IOS version have media-independant interface detection, in which case the sort of cable you are using would not matter anymore.
What do you have connected at the other end ? Typically, the uplink port would be a trunk, which has to be configured the same way at both ends. Can you post the configuration of your 'problem' switch and of the device (switch or router) that is connected at the other end ?
Regards,
GP

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Crossover cable to router issue

i have AX with iTunes as my router. i am trying to make a motorola print server work with it (suggestion: DON'T buy a motorola product that says it is mac compatible unless you love migranes).
in the second stage of the setup, i have to connect the print server to my computer with a crossover cable and type the print server's ip into a browser to get its setup screen (ie, http://10.0.1.100 because i know the print server's ip is 10.0.1.100).
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thanks,
Ian

Ian,
If you have two networks (wireless via Airport and wired via Ethernet) that both use the 10.0.1.X subnet then there may be a simple reason, and solution to, your problem. Your Mac must choose a network interface to send packets to and your's is likely choosing Airport instead of the Ethernet port. You can easily choose which interface the Mac uses first by opening the Network preference pane, then choosing "Network Port Configurations" from the "Show" pull-down, then either drag "Built-in Ethernet" to the of the list or temporarily disable "Airport".
Once you have finished configuring your printer then make sure to change your settings back to how they were.
Hope that works for you,
Tim

Connecting Macbook to PS3 using Crossover Cable

I am attempting to connect my Playstation 3 to my Macbook. My Macbook is connected to a Telus internet stick which is successfully connected to the internet. I have just purchased a Nexxtech Crossover cable and have connected that between my Macbook and PS3.
The issue is getting my PS3 connected to the internet.
I have enabled internet sharing in system settings on the Mac.
For the PS3, I am assuming to go: network settings, internet connection settings, custom, wired connection, auto detect, and then manual ip address. The problem I believe is the settings for IP address, subnet mask, primary and secondary DNS. It is these fields of information that I don't know how to fill.
Much help is appreciated, I have been at this for hours.

You don't need a crossover cable as at least the Mac is auto MDI/MDI-X.
The PS3 should use DHCP and you might encounter problems depending on wether you have the firewall turned on or not on the Mac.

Connecting the RT to the computer by crossover cable

I have a problem in connecting the real time to the host computer by crossover cable. Sometimes it gives me the error that the connection with the RT is lost. Whenever I get this error, I can't connect the RT to the computer anymore. Although the Ip is set to be the same, the led light on the ethernet port of the RT doesn't blink. I think there is a problem in connecting my RT to the computer. I appreciate if you can help me to figure this out.
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Thanks Aaron,
Yes, I followed the instruction completely. It seems there is a hardware defect in our PXI. Whenever the real time disconnects from the PC, the ethernet light turns off and there is no communication between the RT and the PC. The RT is connected to the PC by crossover cable and the link lights should be displayed when a valid connection is present. Shouldn't?
After having this problem, I can not make the Rt and PC talk but if I plug the RT to other ethernet cards on other computer, the light starts blinking and after that I unplug from the other computer and connect the cable to the PC and it works. Is it a sign of hardware defect?
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Why lookup method waits for the crossover cable to plugged in?

Hi all,
In solaris 220 machine i am facing the following problem While executing lookup method.
If the crossover cable is properly connected lookup method is working fine.
If the crossover cable is unplugged, lookup method is waiting indefinitely until the cable is plugged in. (Lookup method is not throwing any exception )
Is there any way to avoid this ?
Please help me with this issue..
Thanks in advance...

Hmmm.. well I tried the idea of establishing the connection using the Network Browser feature of Classic os9 under the brand new twin 2.7Ghz powermac I have to the old clone, and found a bunch of missing extensions inc. the Network Browser!
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Is Apple suggesting not to try networking in the classic layer? Is it an experiment I shoudnt bother with?
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Ethernet cable vs crossover cable

What is the difference between a ethernet cable and a crossover cable. For example, I know you need a crossover cable to link xbox's together, but why doesn't a standard ethernet cable work? I always thought they were the same thing?

Because some devices require the transmit line be connected to the receive line rather than the transmit line of the other device. In such a case a crossover cable is required. Some devices can auto-sense and automatically switch internally thus no requiring a crossover cable. Modern Macs, for example, don't require crossover cables for direct connection because they auto-sense and switch the lines internally.
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How do I connect Macbook Air to Macbook via ethernet crossover cable?

Hi all,
For the life of me, I'm having a lot of troubles connecting my Macbook Air to Macbook, here is what I've done so far:
1. Turned on sharing in System preferences on both systems and given "read and write" access to "myself", "users" and "everyone".
2. Then connected a ethernet cable to both macbook and macbook air (via original Apple USB ethernet)
3. When I go to Finder > Shared on both systems, they say cannot open drop box insufficient privileges.
Please someone link to step by step tutorial of Mac OS X 10.5 sharing through ethernet cable or correct me on what I'm doing wrong, and I don't have firewire cable otherwise things would've easier .
Thanks in advance!

You are probably over thinking the problem.
Do not use a crossover cable. Just connect the two machines directly with a standard ethernet cable and they will auto assign ip addresses and be accessible to each other. The ethernet chips in both machines will detect the cable, etc and it "just works".
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How to share an airport internet connection with XP thru a crossover cable

Any help appreciated - My iMac is connected to the internet and home network through airport. I would like to connect an XP machine to the iMac through ethernet with a crossover cable. I'd then like to be able to share the iMac's internet and network connection with the XP and file share between computers.
How should I configure the machines? I can get them to share files (with a manual IP address) but even though "Internet Sharing" is clicked on the iMac the XP does not connect to the internet.
iMac is running 10.5.6
thanks for any help!

Yes, I do have "internet sharing" turned on. It is set to share the connection from Airport to computers using Ethernet. But there is no internet on the PC. Should they both be set for DHCP? (they are)

Burning an iMovie and Connecting eMacs via Crossover Cables

Is the following solution to my scenario possible:
I have a dead Superdrive in one of my eMacs and am unable to burn (obviously). I would still like to use the eMac to create movies using iMovie but am wondering if I can connect this eMac to another eMac using a crossover cable, and use the eMac with the working Superdrive to burn the DVD?
I have a fear that this wont be possible if the video files need to be on the computer that is doing the burning. I teach at a school and money is not freely accessible (I realize I could get an external burner and problem solved but this might not be possible and am looking for alternate solutions - maybe this is too crazy for anyone to have attempted before).
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If you have finished editing your movie and have it in an iDVD project, you can create a disk image of your project and use that for burning the actual DVD disks. You can connect the two eMacs via Firewire and use the 'bad' one that has your project on it in target mode. It will then appear on the other one as another drive. You can copy the disk image file of your iDVD project and then burn it on the eMac whose Superdrive is good, using Disk Utility.
Here are instructions for creating a disk image file:
http://docs.info.apple.com/article.html?path=iDVD/7.0/en/6733.html
Here are instructions for setting up the target mode connection:
http://support.apple.com/kb/HT1661
And here are instructions for burning from Disk Utility:
http://support.apple.com/kb/HT2087?viewlocale=en_US
Good luck!

Is a crossover cable necessary here

I am trying use an ethernet cable to connect my iMac G5 directly to an Acer laptop running Windows XP. Have turned on SMB file sharing on the Mac, have a file for sharing set up on the laptop. Everything I've read in the discussions and Apple's support pages seem to indicate that the Mac should auto-detect the laptop, or that I should be able to get my Mac to show up on my laptop's "My Network Places" using the connection wizard or other method, but it's just not happening. What I've read in the discussions and suppport area also indicate that a crossover cable shouldn't be necessary -- or could that not be the case? If you have any insight into why I can't get this to work, I'd be most grateful if you could share it.
Thanks,
Dave
iMac G5 Mac OS X (10.3.9)

Thanks Barbara, that helped a bit. But actually what I was really missing was a little fact that you need know: how to give an IP address to each computer when they are just two machines connected with no internet connection. In case anyone reading this needs to know, the following on how to name the ip address for the Windows machine here from http://www.smartcomputing.com/Editorial/article.asp?article=articles/2004/w1510/ 38w02/38w02.asp :
"Click Start, My Network Places, and Local Area Connection.
Click the Properties button on the General tab of the Local Area Connection Status window. Scroll through the list of connections, if necessary, and click Internet Protocol (TCP/IP). Then click the Properties button.
On the next window, click the Use The Following IP Address radio button and type your IP address and subnet mask. For home or office networks, you should use internal IP addressing, in the form of 192.168.0.x (where x represents any number from 1 to 256). For example, if you use 192.168.0.1 for the first computer, use 192.168.0.2 on the second computer. For this IP range, your subnet on both PCs must be 255.255.255.0.
Click OK and Close. "
To give the Mac its ip address you go to the Finder under Network, and TCP/IP -- I hope Apple can put this in their support pages, would have saved me hours.

Attempting to transfer files via ethernet crossover cable and FTP

So i just got my new laptop yesterday, i need to transfer my media (Movies, shows, and Music) To the new computer, i want to do this via CAT5 because it will take less time.
What i tried to do is take the information provided on the WiKi HERE
On the computer which has the media, i did:
# ip link set up dev eth0
# ip addr add 139.96.30.100/24 dev eth0 # arbitrary address
Then on the new laptop i did:
# ip link set up dev eth0
# ip addr add 139.96.30.120/24 dev eth0 # arbitrary address
This assigned the IP correctly and also connected the computers to the ethernet network via WICD, but when i attempted to log into Filezilla (With the internal IP address, the username, and password on the account of the new computer) It failed, said that it couldnt connect.
I have httpd and sshd running on both laptops
Anything i did wrong? I know the commands i used were from Internet Sharing but in theory those commands should still work for this.
~The Dyzaster

alphaniner wrote:
Crossover cables are only necessary when connecting two machines directly (no switch/router/etc. involved). And even then they generally aren't necessary with Gbit interfaces.
connected the computers to the ethernet network via WICD
Does this mean you have confirmed basic connectivity (ie. ping)?
Actually i did not do a ping, i was not thinking about it at the time (Had a few drinks)
But WICD was connected to the interface, im about to hop in the shower and once i come back out i will set it up once more and this time i will send a ping.
Also, im only using 2 computers and am too cheep to buy a switch, plus its not needed lol. But i do have 1GB ethernet ports on both computers, so it should be faster then WiFi (Which i have gotten the wifi to run successfully, just takes too long)

Interconnect with a crossover cable (NIC bge1) does not work in Solaris 10

I connected two systems with a crossover cable for Oracle 10gR2 RAC like below commands.
systemA> ifconfig bge1 plumb
SystemA>ifconfig bge1 192.168.2.101 netmask 255.255.255.0 up
systemB> ifconfig bge1 plumb
SystemB>ifconfig bge1 192.168.2.102 netmask 255.255.255.0 up
The I connected with a crossover cable between systems.
Once, I was able to ping between systems. After I reinstalled OS, I cannot ping between systems.
Here is the output of 'ifconfig -a' from one system.
# ifconfig -a
lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232
inet 127.0.0.1 netmask ff000000
bge0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
inet 10.14.101.23 netmask fffffc00 broadcast 10.14.103.255
ether 0:14:4f:5c:b7:ea
bge1: flags=1000803<UP,BROADCAST,MULTICAST,IPv4> mtu 1500 index 6
inet 192.168.2.101 netmask ffffff00 broadcast 192.168.2.255
ether 0:14:4f:5c:b7:eb

Here are outputs from both systems. I read the article about NIC type bge has some problem for interconnect with a crossover cable. It was working last week. I guess I need to make 'RUNNING' for both bge1.
Thank you for your help.
-Yong
SystemA
====================
$ grep network path_to_inst
"/pci@1f,700000/network@2" 0 "bge"
"/pci@1f,700000/network@2,1" 1 "bge"
"/pci@1d,700000/network@2" 2 "bge"
"/pci@1d,700000/network@2,1" 3 "bge"
# ifconfig -a
lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232 index 1
inet 127.0.0.1 netmask ff000000
bge0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
inet 10.14.101.24 netmask fffffc00 broadcast 10.14.103.255
ether 0:14:4f:5c:b7:72
bge1: flags=1000803<UP,BROADCAST,MULTICAST,IPv4> mtu 1500 index 6
inet 192.168.2.102 netmask ffffff00 broadcast 192.168.2.255
ether 0:14:4f:5c:b7:73
System B
======================
Password:
Sun Microsystems Inc. SunOS 5.10 Generic January 2005
You have new mail.
# grep network /etc/path_to_inst
"/pci@1f,700000/network@2" 0 "bge"
"/pci@1f,700000/network@2,1" 1 "bge"
"/pci@1d,700000/network@2" 2 "bge"
"/pci@1d,700000/network@2,1" 3 "bge"
# ifconfig -a
lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232 index 1
inet 127.0.0.1 netmask ff000000
bge0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
inet 10.14.101.23 netmask fffffc00 broadcast 10.14.103.255
ether 0:14:4f:5c:b7:ea
bge1: flags=1000803<UP,BROADCAST,MULTICAST,IPv4> mtu 1500 index 6
inet 192.168.2.101 netmask ffffff00 broadcast 192.168.2.255
ether 0:14:4f:5c:b7:eb

Share Internet by crossover cable

How can I share Internet connection by crossover cable?
I have Ubutnu on my laptop. On there, wireless and everything works.
However I am trying to install Arch-linux on my main (desktop) PC. And there, during basic install, it can not detect my wireless connection.
How can I share connection from my laptop with my desktop?
How can I connect to the connect on my laptop from Arch?
Last edited by kdar (2009-12-12 21:42:34)

eldragon wrote:
#!/bin/bash
# Shares internet from wlan0 through eth0
case "$1" in
start)
ifconfig eth0 up
ifconfig eth0 192.168.0.1
iptables --table nat --append POSTROUTING --out-interface wlan0 -j MASQUERADE
iptables --append FORWARD --in-interface eth0 -j ACCEPT
echo 1 > /proc/sys/net/ipv4/ip_forward
echo "set other computers in the range of"
echo "192.168.0.0 255.255.255.0"
echo "gateway 192.168.0.1"
echo "dns 192.168.10.1" #this is my router's ip, you should use yours or another dns server
stop)
echo 0 > /proc/sys/net/ipv4/ip_forward
ifconfig eth0 down
iptables --table nat --delete POSTROUTING --out-interface wlan0 -j MASQUERADE
echo "usage: $0 {start|stop}"
esac
this does just that
check if iface names and ips fit your gear, the network between both computers connected with the x-over cable must be different from your router's lan network.
Wow! I got to try this out!

Oracle RAC and crossover cable for private network

Hi,
I have the following configuration: two database servers, each has four network cards, two for public network and two for private, cluster network. Each public card has own IP-address and both have virtual IP-address, defined in operation system (SLES-9) for redundancy. Because I have only two machines in the cluster I want to connect the two machines for private with crossover cable without switch. For redundancy I want to make two connections between machines. Is it at all possible? How should I defined all network interfaces and what should be included in /etc/hosts for properly work of Oracle cluster?
Best Regards,
Jacek

Hi,
You can build a RAC witch CROSSOVER, but the Oracle no homolog.
As you have 4 cards, 2 to public (redundancy) and 2 to interconnect (redundancy) you need of a software to to make a TEAM, and create a card virtual that will have a IP address.
Eder

Are there benefits to adding crossover cable between two servers for DFS replication and SQL Always On?

I have two identical servers with 4 network interfaces each. The primary usage for two servers is hosting SQL Server instance with Always On high availability and dfs replication. Two network interfaces from each server will be used to connect to main network,
while for the other two (on each) I was thinking about using crossover cable to possibly provide shorter path for two servers to communicate.
Will there be any benefits to doing so, moreover, would teaming two crossover cable help more?
Edit: Below is the link to the article where I got the idea of moving DFS Replication traffic to crossover. I wasn't able to find any info whether same thing is applied to SQL Always On high availability.
http://blogs.technet.com/b/filecab/archive/2006/08/24/449013.aspx

Hi,
According to your description, my understanding is that you want to connect 2 servers by crossed cable(2 NICs).
Just as the blog suggested, directly connect the servers by crossed cable and configure corresponding route entries will improve efficiency.
If both servers have 2 NICs to connect, I recommend you to team the 2 NICs for bandwidth aggregation. NIC teaming is supported by Windows Server 2012/2012 R2, detailed information you may reference:
NIC Teaming Overview
https://technet.microsoft.com/en-us/library/hh831648.aspx
besides, for file servers, SMB Multichannel (a feature included with Windows Server 2012/2012 R2 and part of the SMB 3.0 protocol) will helpful for increasing the network performance and availability. Detailed information reference:
The basics of SMB Multichannel, a feature of Windows Server 2012 and SMB 3.0
http://blogs.technet.com/b/josebda/archive/2012/05/13/the-basics-of-smb-multichannel-a-feature-of-windows-server-2012-and-smb-3-0.aspx
For SQL server, suggestions in SQL Server Best Practices would be helpful for you:
https://technet.microsoft.com/en-us/sqlserver/bb671430.aspx
Best Regards,
Eve Wang
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Catalyst 2948-GE-TX crossover cable issue

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