The ethernet tag has no wiki summary.
-1
votes
1answer
68 views
Can a host launch a DOS attack on Ethernet?
Here is my trail of thought:
Since Ethernet works on the principle of CSMA/CD one can possible setup a rogue host which transmits packets all the time forcing other to exponentially back off until ...
1
vote
2answers
106 views
Serial to ethernet cable: how to connect to device
How can I use a serial to ethernet cable to connect to a device: in my case a
Hp ProCurve AP?
A serial to USB or serial to serial would have been great but I found this serial
to ethernet cable from ...
2
votes
2answers
66 views
Is it possible to wake a computer connected directly to its NIC?
If two computers are connected by ethernet directly (ie, with no router between them) can one computer wake the other using the magic packet?
I ask because it's not working for me and I'm not getting ...
0
votes
1answer
60 views
How to troubleshoot the suspected ethernet card failure [closed]
Sometimes one of the laptop when attached to the dock would drop the ethernet connection. By constantly pinging the default gateway usually there are no packet drops but sometimes, it results in ...
-2
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0answers
18 views
Should I wire directly to the basement for ethernet, or have a switch connected to another switch? [migrated]
I have a project where I'm wiring my home for ethernet. I have four bedrooms upstairs, all of which are getting two ethernet connections each, and then a few rooms downstairs as well. I was thinking ...
-4
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0answers
81 views
Difference between FastEthernet and Gigabit Ethernet [closed]
As Gigabit Ethernet cable has only twice as many wires as FastEthernet cables - how come that the data rates are so high? It's 1Gb/s contrary to the old 100MB/s used in FastEthernet. And besides, ...
1
vote
2answers
90 views
Ethernet over IP
I need to merge two L2 broadcast domain into single domain and I have to do this over unmanaged by me L3 IP network.
All that I could find is vtun utility for linux.
Which software&howto you can ...
0
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2answers
51 views
2 networks with a layer 2 bridge that shouldn't be there.
I have 2 separate networks that I manage. They have a router between and layer 3 connection is working fine. Last week my DHCP servers started handing out IPs across the networks, looking around I ...
3
votes
3answers
217 views
Ethernet frames: what are the source and destination MAC addresses?
Imagine you have some network configured like this
+-----+ +------+ +------+ +-----+
|comp.|---|bridge|---|router|---|comp.|
| A |---| B |---| C |---| D |
+-----+ +------+ ^ ...
4
votes
3answers
73 views
Phantom NIC issue causing eth0/1 to drop out
We are experiencing a very strange and frustrating problem. Our company has servers here in Massachusetts, as well as in California. The issues we are seeing are only on the CA hardware. Out in CA, we ...
3
votes
1answer
158 views
Why is half-duplex mode supported for 10BASE-T and 100BASE-TX networks?
I'm currently learning about Ethernet standards, auto negotiation and duplex mismatch. That made me wondering why half-duplex operations is allowed in 10BASE-T and 100BASE-TX networks. Wouldn't it ...
1
vote
1answer
127 views
Solaris ethernet ports: e1000g1 and e1000g2 are not working
I can plumb and configure e1000g0 and e1000g3 using ifconfig, but I can't seem to make use of e1000g1 or e1000g2.
When I try ifconfig e1000g1 plumb, I get ifconfig: plumb: e1000g1: Invalid argument.
...
-6
votes
1answer
63 views
My business computer doesnt connect to any ethernet device outside business lan [closed]
My computer which i use at work is within a domain. And our internet connection is through some kind of filter. So in Internet Explorer, there is a configured lan setting. When i try to connect any ...
1
vote
4answers
135 views
Virtual interfaces with default routes
My Ubuntu Server has one physical interface eth0. I want to assign 3 ip's (different subnets) to the server. I cannot use the default virtual interface creation tools like ifconfig or ip addr add ...
-1
votes
1answer
18 views
Accessing a connected device through LAN
I have a metered APC Power Distribution Unit (PDU) which is capable of spewing out the current load, power and such information through a LAN cable. I'm connecting the cable from the PDU to a server ...
0
votes
1answer
23 views
Netgear FVX538v2 slow whene connected to Canoga Perkins N525 ETSU
First of all thank you in advance for helping me. my issue is the old network admin found a problem whene he connected the firewall and the ETSU together the through put went down to less than 1 mega ...
1
vote
0answers
89 views
QLogic QLE8152 won't link up with a fiber loop
I have a Dell R710 running Debian Linux 6.0 (Squeeze). I installed a QLogic QLE8152 CNA in the PCI-E riser today and I have been trying to get the CNA's ethernet layer to come up after I put a fiber ...
0
votes
1answer
69 views
Would the source and destination address in ethernet frame change?
Say there are 2 computers are connected this way in a wireless network:
Computer A -> Access Point 1 -> Access Point 2 -> Computer B
When a frame is sent from Computer A to Computer B, the frame ...
0
votes
1answer
52 views
How to determine the interface name for 2 Ethernet adapters with 8 ports?
I have 2 Ethernet adapters on a 2U server, each of them has 4 ports, for a total of 8 ports. Is there a way to find out the interface name(eth0, eth1 ...eth7) for each port without connecting to a ...
1
vote
5answers
208 views
Is a Router required to set up a network? [closed]
Is a router required to set up a network?
Suppose I have just an Ethernet wire and then I fix it up to 3 computers.
Can I then say that these computers are now in a network? If they are in a ...
9
votes
6answers
433 views
Direct ethernet link between two servers
Say I had two servers which needed super-low latency (Database, file etc.). Would it be possible to directly connect the two servers with 10GbE, so each server had 1 (in the real world it would have ...
1
vote
2answers
101 views
Two network adapters with the same ip
I have two network adapters that use the same ip range, but are different networks.
I tried this but it didn't work:
iptables -t nat -A OUTPUT -p all -d 1.2.3.0/8 -j DNAT --to-destination ...
6
votes
1answer
198 views
Ethernet interface errors
My Ubuntu servers ethernet interface that connectes to ISP's multiplexer shows errors. Here is the snapshot:
RX packets:204564288 errors:3193970 dropped:0 overruns:0 frame:3138402
...
0
votes
1answer
28 views
Two network Macs have slow internet
I work in a boutique advertising agency as a web developer. I have my own servers at home for my website.
In our office, we have 8 Macs. Two of the iMacs are against one wall with an ethernet cable ...
6
votes
1answer
64 views
What is, and what problems result in a 'carrier error'
I haven't found a really clear definition about what a 'carrier error' is within the context of the ifconfig output for a interface. I have been searching on Google and there really isn't a great ...
1
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3answers
84 views
Ethernet link negotiates a connection only in half duplex mode
I have a NIC which is capable of 100BaseT/Full. But it negotiates a connection only on 100baseT/Half mode. Here is the output of mii-tool:
eth0: no autonegotiation, 100baseTx-HD, link ok
The ...
0
votes
1answer
73 views
Ubuntu Server, 2 Ethernet Devices, Same Gateway - Want to force internet traffic through 1 device (or at least allow it to work!)
I have a Ubuntu 10.04 Server with 2 ethernet devices, eth0 and eth1.
eth0 has a static IP of 192.168.1.210
eth1 has a static IP if 192.168.1.211
The DHCP server (which also serves as the internet ...
0
votes
1answer
43 views
Server can only make outbound connections
My server is running Ubuntu 10.04 and is connected by ethernet to a router/modem device. The problem is that it's basically ignoring incoming connections. So I can't SSH into it or access the ...
1
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0answers
70 views
Descriptions of Ethernet register/counter names?
Is there a manual/datasheet/some other resource that explains what do all these counters in ethtool -S <interface> mean? Some of them are self-explainatory, some aren't...
I'm taking them from ...
1
vote
3answers
73 views
Intel Server Board: Ethernet MT connection vs PM connection
What's the difference between an MT ethernet connection and a PM ethernet connection? Intel server board has two ethernet ports that are named in that manner.
0
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2answers
89 views
Carrier ethernet vs Metro ethernet or any other alternative?
We have three remote offices (office A, B, and C), two (Office B and C) of them need to access the Linux file server and web application server in Office C. We also need to administer the network of ...
3
votes
1answer
92 views
Programatically extracting interface configuration from the system?
I would like to produce a list of all the interfaces available on a [Linux] system, and for each interface, produce a list of available IP addresses. I was hoping to do this in a more graceful ...
1
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0answers
60 views
Multi-NIC Linux machine's NICs are responding to each other's ARPs regardless of arp_filter setting
I have an old Linux machine running a 2.4.37 kernel. In the machine are two NIC cards both on the same network with different IPs. For some testing, we want each IP's traffic routed through that NIC, ...
1
vote
4answers
78 views
Linux - Is there a way to determine what mac addresses an interface has seen traffic from?
Yes, I know about ARP but that relies somewhat on IP layer connectivity in that the remote system must be configured with an IP on a recognized subnet. Is there any way to just dump off what mac ...
3
votes
4answers
71 views
Is there a device or piece of software that can act as a transparent Ethernet bridge and limit bandwidth on MAC by MAC basis?
So for example, it will only let a particular MAC address on side A use 100kbps in ether direction.
2
votes
1answer
305 views
How do I configure a USB ethernet adapter under CentOS 5.3?
I've got a server running CentOS 5.3 (Final; kernel version 2.6.18) which I need to add a 2nd NIC to, initially temporarily, but eventually permanently. I'm not familiar with installing drivers under ...
1
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3answers
97 views
interface id for ethernet card
My PC (CentOS)has one ethernet card 1, linked to the internal company network for internet surfing etc., and another ethernet card 2, linked with an embedded device for programming.
Each time, when ...
0
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3answers
62 views
SBS 2003 loses Connection to specific clients if not running Ping -t
I have inherited a client running SBS 2003 R2 and a mix of WinXP and Win7 clients. All machines have the latest updates.
I started getting complaints that 1 or more computers would 'drop off' the ...
1
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2answers
169 views
How can I troubleshoot APIPA (169.254.x.x) in physical network cabling?
all:
We have just started using an existing Cat5e cable to run 100Base-T to a new office, but unfortunately, machines in the new office see link but receive an APIPA address (169.254.x.x).
I brought ...
18
votes
3answers
443 views
Best way to get the MAC of eth0?
Is there a more efficient way to retrieve the MAC address of a NIC in Linux?
This works:
ip link show dev eth0 | awk ' /link\/ether/ { print $2 }'
but can it be found via something like:
cat ...
1
vote
3answers
103 views
Virtual Ethernet Adapter / Multiple MAC and IP address for one adapter
I need to emulate multiple (10+) Ethernet adapters (different MAC and IP, same subnet) through a single Ethernet adapter. I know you can assign multiple IP addresses to a single adapter, but haven't ...
1
vote
3answers
92 views
Can't set up FC HBA with DHCP
I've got IP over FC working, and have the HBA (QLogic QLA2340) connected to a router with a DHCP server on it. However, whenever I do a:
ifconfig fcip0 dhcp start
I get:
ifconfig: fcip0 wait timed ...
0
votes
1answer
151 views
dhcp-server + iptables: Can't share ppp internet connection
I had this configuration before, and it used to work well, but now I got a new server and I can't setup it to share the internet connection from ppp0. I'm on Debian testing.
The client connects ...
0
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5answers
134 views
Break Network between two hosts without pulling Cable
I have two Linux hosts HOST1 and HOST2 connected by cross cable. How I can break the network between then without breaking the physical wire (I don't have access).
If i do:
HOST1# ifconfig eth0 ...
3
votes
1answer
37 views
Machine cannot communicate on local network any more
I have a machine that has a problem I've never seen and cannot understand.
The machine is a Dell laptop with Windows 7 Ultimate. The user tried to do something fancy with this machine (bridging the ...
0
votes
1answer
26 views
Configuring ip, subnet and gateway on eth interface
I'm in terminal on RedHat 5 and I need to configure one of the two eth interface with different IP, GATEWAY and SUBNET.
I know ifconfig and route add but I'm not sure what I have to do for ...
0
votes
1answer
101 views
How to identify device and its IP on network by MAC on Ubuntu 10.04+?
I have a NAS (LinkStation Mini). Its windows software identifies it correctly. I want to identify device and its IP and mount the same.
0
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5answers
151 views
My wireless is faster than my lan by a lot… why?
At my job the wireless is pulling download speeds of 11mbps and uploading at 2mbps. The lan however is averaging around 2-5mbps download and 1-2mbps upload. Our setup is pretty basic, a cable modem, ...
8
votes
2answers
264 views
Why both T568A and T568B standards?
I've always wondered why there are the two different wiring standards for Cat5 UTP cabling. The only technical difference between the two is the green and orange pair are swapped, which accomplishes ...
1
vote
3answers
308 views
Can a broadcast storm develop in a loop caused by a wifi connection?
If my laptop or other computer is tied to a wired network, and it automatically joins a wifi router attached to that same network, can the two connections to the network cause a loop that starts a ...
