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Questions tagged [nic]

A Network Interface Card is a computer component which connects to a physical network in order to send and receive data.

321 questions
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How much memory does a common NIC have?

What's a common amount of memory for a Network Interface Card to have? In a scenario where a fast network connection is available and there is a slow (or busy) disk, will the NIC be smart enough to slow network transactions?
Sam Youtsey
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how is TCP's checksum calculated when we use tcpdump to capture packets which we send out

I am trying to generate a series of packets to simulate the TCP 3-way handshake procedure, my first step is to capture the real connecting packets, and try to re-send the same packets from the same machine, but it didn't work at first. finally I…
jason.foo
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File.Move / File.Copy uses Network Interface Card (NIC)?

Does File.Move / File.Copy uses NIC to move files from one computer to another? If not, how could I program in C# to use NIC to transfer files from one computer to another?
Gopi
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Multiple NIC's on apache2 web proxy server

I have a question regarding traffic routing on a Linux machine with two NIC's. One of the NIC's is on our DMZ net (10.1.9.0/24) and the other is on our local net (10.1.0.0./21): default via `10.1.4.1` dev eth0 default via `10.1.9.1` dev eth1 …
Jakob Simon-Gaarde
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.NET Remoting Client's Problem when running on the machine with Multi NICs

I built a .NET Remoting Client which works quite fine on the machine of single NIC, and lots of testing messages received via remoting event. But when additional NIC was added, the Client seemed to be able to connect the remoting Server, but the…
cui chun
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Cloudera 4 - Hdfs / Hbase - Internal communication over second NIC in private network

we have set up CDH4 (hdfs, hbase, hue, mapreduce, oozie and zookeeper) on a test cluster using the Cloudera Manager. Everything works fine except we can not seem to figure out how to make the nodes communicate via eth1 in a private network while…
jvataman
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JMX and two network interfaces

At work we have two PCs with Windows XP and JDK 1.6.0_07 (no update of Java is possible for now), both with two network interfaces (NICs), the first has IPs in the form of 190.1.XXX.XXX (lets call it IA), and the second has 190.2.XXX.XXX (IB).…
igorepst
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Check if TCP segmentation has been offloaded for a particular interface

I know we can check through ethtool whether TCP segmentation has been offloaded. But I need to get this info from my own code. What is the simplest way to do this? Is there a flag that I can check for this? Thanks Supreeth
user1295872
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Bicep Template for NIC breaks internet access when adding in Load Balancer Configuration

I am trying to deploy the network interface card for a SQL Server VM, that will be placed as part of an AlwaysOn Availability Group and subsequently should be added to my Internal Load Balancer. This card will be created in advance of the VM…
johubb
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How to dynamically modify QP rate limit in ConnectX-6 Infiniband/VPI adapter

I have a ConnectX-6 Infiniband/VPI Adapter. I can setup the hardware rate limit when creating a qp like this: ... ibv_qp_attr.ah_attr.static_rate = 7; // set qp rate limit to 40Gbps ... ibv_modify_qp(qp, &ibv_qp_attr, flags); ... But I cannot…
Dillion Wang
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DPDK: Problem with Rx offloads capabilities

I'm trying to set environments to test programs written in the P4 language, using t4p4s as the compiler. When a P4 program is compiled with t4p4s, a C/C++ program using DPDK is generated, which in turn is compiled and run. Compiling the program…
mindoverflow
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How to use specified network interfaces for webRTC apps?

I would like to specify network interfaces for RTP stream for a simple webRTC application. I am using webRTC applications on my server-client testbed. Here is what the testbed topology looks like: Server: NIC to external network with public ip…
Jack
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ConnectX-5 DPDK performance degradation when enabling jumbo, scatter and multi segs

I’m using a ConnectX-5 nic. I have a DPDK application on which I want to support jumbo packets. To do that I add rx offload capabilities: DEV_RX_OFFLOAD_JUMBO_FRAME, DEV_RX_OFFLOAD_SCATTER And tx offload capabilities: DEV_TX_OFFLOAD_MULTI_SEGS I…
hudac
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fsl_dpa NIC memory leak?

I encountered a memory leak issue which led to system crash。 Analyzing vmcore, found that there are so many skb(list as below) not freed. crash> kmem -s |grep skbuff_head_cache ffff80007b2a0c00 256 426183 426416 26651 4k …
邢庆杰
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Aync shell script on Ansible to handle connection reset

Despite looking at many posts on SO and Ansible's doc, I'm still failing at understanding what Ansible is doing. My scenario is following: I need to rename the network interface Ansible is connected over to control the remote and restore…
Cilyan
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