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Questions tagged [ethernet]

Ethernet is the most common set of standards for wired connections in local area networks.

Ethernet is the most common set of standards for wired connections in local area networks.

Originally designed in the 1970s, Ethernet had a data rate of 10 megabits per second. Later, Ethernet was extended to support rates of 100 megabits/second, 1 gigabit/second, 10 gigabits/second and 100 gigabits/second.

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Full MTU not utilized with jumbo frames enabled

I've been testing to see if I can get any benefit from enabling jumbo frames. I've set up two identical Dell R210 servers with Xeon quad core E3122 CPUs, 8G of RAM and Broadcom NetXtreme II BCM5716 Gigabit Ethernet cards. I'm running Debian…
sevenr
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Maximum throughput on switch with different link speeds

While doing some benchmarking on a network app I discovered strange behavior that involves 100MBit and 1GBit ethernet clients connected through a switch (at-gs900/8e). I have one server (Gbit) and multiple clients, the network app uses TCP/IPv4. The…
Simon
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OpenVPN to host tap device having very large MTU

Question What is the minimum set of server and client configuration directives that I need in order to satisfy the following conditions? Virtual layer 2 ethernet network that will not be bridged with any other interfaces. VPN clients can exchange…
Iron Savior
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Missing Ethernet preamble

I am helping my colleague debug his problem. Basically, there are two 10M devices, and only one of which we have control over (the other being a "black box"). Analyzing the Ethernet hardware signals with a scope shows that, when the two devices are…
Randomblue
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Need to "extend" wireless signal to conference room

We have a network set up using an ASUS RT-N66U for our office with the following configuration: Private SSID (one for 2.4 GHz and 5 GHz) Guest SSID (one for 2.4 GHz and 5 GHz) Unfortunately, we've had some signal problems (the spectrum is fairly…
Ben Burton
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How can I make a secondary NIC port "eth0"?

I am using CentOS 5.9. One of my servers recently had a malfunctioning NIC port. The software running on the server was hard-coded to use eth0. The other physical NIC ports were fine and unused. The issue is now resolved but I'm curious, how hard…
Mike B
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Autonegotiation on laptops for mobile users a must now?

I work in Unified Communications for a company with about 9000 desktops and laptops. I'm part of a team who is implementing and supporting things like Lync and Jabber Video and audio conferencing. While troubleshooting some pretty constant call…
Shawn Kennedy
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Why is there an EtherType for SNMP?

Today I was reading through some documentation about the fundamentals of networks (IP, Ethernet, MPLS, ...). And while looking at the Ethernet Types that can be used in the Ethernet Frame I saw there was an Ethertype for Simple Network Management…
Christophe Lambrechts
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Hyper-V Virtual Machine Networking issues related to Max Ethernet Frame Size

I fixed an issue today earlier today but i'm interested in learning WHY it worked. We set up a new Hyper-V virtual machine only to discover that HTTP traffic wasn't working. HTTPS, pings, everything else was working fine. After months of prodding…
Brett Larson
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Why is the link between my switch and my router always negotiating half-duplex mode?

I have a Cisco 2950 switch which has one of its ports connected to an Internet router provided by my ISP; I have no access to the router configuration, but I manage the switch. If I leave all switch ports with their default setup (auto-negotiation…
Massimo
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Two network cards latency

I'm trying to setup a network architecture where one network is a low-latency low-bandwidth tcp control system (GBit), the other is a high-bandwidth udp (maybe tcp) network that could get saturated (GBit). If I have two NICs inside a server running…
Ross W
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Can't start eth1 and dhcp on debian wheezy

What I want: eth0 is connected to internet and has a static IP-address. eth1 connected to internal network and be a dhcp server for subnet. But I can't get eth1 to work. Error: $ ifup eth1 Missing required variable: address Missing required…
jacksoncage
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Difference between ethernet switch and ethernet pass-through

Most blade server systems can have an ethernet switch module or an ethernet pass-through module. What is the difference between both? Is the pass-though module simply "dumb" as a hub? Why would you choose one over the other?
medihack
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Server ethernet bridging, fail-safe

Is there server hardware available with two ethernet ports, that can turn into a fail-safe bridge when offline? My use example is a server that does filtering and traffic monitoring on an ethernet bridge interface, but can turn into a…
axon
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How do I dynamically obtain IP addresses for VLAN interfaces?

I have an Ubuntu machine on which I have created four VLANs, namely eth0.100 ,eth0.200 , eth0.300 and eth0.400. I want to dynamically obtain the IP addresses using the DHCP server. It should provide an IP from different range of IP addresses,…
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