networking

I have been trying very hard to find about buffers used in TCP/IP as part of packet transfer in linux. More i read, more i get confused. Below given are questions i have. Can someone help me figure it out? 1)Is the driver queue which is implemented as a ring buffer with descriptors pointing to...

Hi, i use a linux ubuntu like a gateway/firewall with iptables with 3 eth, in one (Lan eth) i configure a eth for working with a subnetting and adding two ip on the eth: 192.168.6.1/25 and 192.168.6.129/25. In a linux host i can navigate, in some host i configure one segment of subnetting and in...

Hi, I wanna setup an PXE Server in ym Network. In my network is allready a DHCP Server running and i dont wanna turn it off. So now i want to ask you, if it is possible to use the existing DHCP Server in the network and dont install one on the PXE Server. Thank You ! LinuxTux23

I want to try setting up a linux server that should host a minecraft server, now the console from the minecraft server is very important (in and output), so how could i get the in/output to another terminal window (like typing "send commandXYZ to minecraftConsole")? Is it maybe possible to do...

need possible ways and also the optimal one to find the curent number of openfiles in linux.

Good morning, I'm doing some network measurements with a program that collects data from the folder /sys/class/net/<if>/statistics. In my measurement program, I have a line of code stating that, in a 1 second reading, the rx_dropped and tx_dropped values cannot be higher than the rx_packets and...

Hello Guys, I recently signed up for the forum. My work requires for me to be updated since i am in networking. Soooo i thought this might be an interesting place to ask if anyone knows a good reputable Online course provider that provide CCNA Programmes?? Thank you in advance. Alex Walker

Hi everyone,recently I have a problem about centos: I installed minimal centos7 on the virtualbox and set up the network connection as a bridge, but I can't connect to the network in centos (eg ping, yum update...). But when I switch back to the NAT connection, I can actually connect to the...

Hello all, I have a CentOS 7 server with an Emulex OCE14102-NT card installed into one of its PCI slots. The card has two 10Gbps NICs with unique MAC addresses for each NIC. I am trying to configure each NIC with an address on a 172.16.20.0/16 network. I have disabled NetworkManager and...

I'm using a RPi 3 (Stretch) to connect to the internet via a Verizon 4G/LTE USB 'dongle' (Pantech UML295) , which presents itself as eth1. On first power up, the Raspberry always hangs at 'A start job is running for dhcpcd on all interfaces (20s / 1min 42sec)'. At this point, the dongle...

I am trying to network boot Linux via TFTP and so when it starts up it says on the console, "ipaddr not set". Yet when I print the variable ipaddr it shows the ip address as shown in the image. Everytime I change the u-boot configuration I have to issue the command, "env default -a" because...

I am using udhcp client for an embedded device. I am trying to add a feature to set a static IP, Netmask, DNS, and gateway address. I am trying to set it through the "-r" argument (request): /sbin/udhcpc -A 3 -f -s /tmp/udhcpc_wlan0_sh -i wlan0 -r 172.16.0.2 It does not seem to work. I try to...

I'm using nmcli to set up a connection to a 3g modem on the ttyAM0 port. Modem manager has no problem displaying info about the modem. Nmcli creates the connection no problem. But when I try to connect with this new connection I get this error. Error: Connection activation failed. So then I...

I'm using autoSSH to connect to an Amazon ec2 server. I need to automatically reconnect to the server if the SSH connection is lost for a few seconds. I need the system to know that it has lost the SSH connection and then re-establish the connection to the server. In some cases, the Ethernet...

I am using a Raspberry pi for an IOT project. The Raspberry connects to an Amazon ec2 server over SSH. The connection uses a 4G/LTE USB "dongle". I can get the connection made (using wvdial, pppd and autoSSH) - so that all works, but my issue is - sometimes the 4G connection drops, and I...

I would like to replace my existing KVM bridge setup with Openvswitch, as we are facing performance issue when there is heavy traffic on the server. My existing KVM setup consisting of multiple KVM Host servers with Ubuntu 16.04 and 18.04. On each host machine we have two NICS example eth0 and...

I wanted to set up OVS to support a couple of interfaces belonging to an IPS VM. First, I'm only just learning about OVS so please forgive any dumb questions I might submit due to my not understanding how this software behaves. I have in the past brought up a libvirt based VM and bridged a...

I just installed lubuntu 16.10, replacing the previous Ubuntu 16.04 installation (which in turn replaced Windows XP). I'm running a Gateway MA3 with an AMD Turion 64 CPU @ 2GHz, and 1GB of DDR2 RAM. My NIC is a Broadcom BCM 4311 802.11b/g WLAN (14e4:4311). With my previous Ubuntu installation...

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