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Questions tagged [networking]

Managing and using network connectivity on a unix system

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0answers
28 views

Cache all of my internet browsing?

Is it possible to generate a cache of all of my internet browsing on Linux? So, any time I visit a webpage, that page is automatically downloaded to my computer, and the next time I visit said page, ...
0
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0answers
7 views

Mac static routes with weight

We have a company VPN connection that I use on my Mac. They had it setup where only the company networks were advertised through the VPN. This meant that I was able to use my home network and the ...
1
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1answer
24 views

nat configuration for qemu-kvm guest and host networks

Under an Ubuntu 18.04 host, I have set-up an Ubuntu 10.04 guest VM from a cloned HD. The VM fires up fine, I can ssh into it from the host, but it fails to communicate outside of the host. My ...
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0answers
11 views

Using a managed VPN on a unmanaged interface with NetworkManager

Whenever I set up eno1 as a NetworkManager unmanaged interface via /etc/network/interfaces.d/eno1, I can no longer connect to my foobar vpn that is configured in NetworkManager. If I click on foobar ...
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0answers
14 views

Is there any software to access the server which is protected by VPN? [on hold]

Is there any client & server-side software to access the server which is protected by VPN
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0answers
37 views

Forwarding HTTP Request through a VPN and to a local IP [on hold]

Hi, what i'm trying to do is explained as follows: I need to retrieve some JSON data from the Arduino (192.168.1.101) making an HTTP request to 80.X.X.X or to the associated DDNS. First, i have a ...
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0answers
39 views

Did I shut off the network interface?

Debian; 2-orangpi; FW; On my armbian-Debian desktop, right upper corner, there is the dropdown icon - shows my internet connections. It has “enable networking & enable wifi”. I ‘unchecked’ them ...
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0answers
25 views

SSH or VNC to my rpi not working after connecting to nordvpn

I recently got a raspberry pi and installed raspbian OS. I am trying to use this box as a headless torrent box. I am able to download torrents (with Deluge) but as soon as I connect to Nordvpn I ...
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0answers
6 views

OVS Bridge & Layer 2 Port Isolation

I'm curious if it's possible to, using ofctl, essentially drop all traffic between ports on a bridge, except destined to the bridge's internal interface. EG: The bridge has an internal port, and two ...
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0answers
9 views

CUPS and a DeskJet on the parallel port - How to fix my printer setup?

I installed KDE KaOS onto a Dell XPS630i. I have an HP DeskJet 500C printer connected to the machine through the LPT on a PCI-e expansion card with a com port and an LPT. The card and printer DO ...
0
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1answer
31 views

Switch between DHCP server and client on eth0

I am working with a arm micro-controller. Currently the controller is configured as a dhcp client on eth0 (ethernet jack) and as a dhcp server on eth1. I want to configure it to also serve dhcp on ...
0
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0answers
17 views

Is it possible to configure eth0 to be server and client [on hold]

Can I configure eth0 (ethernet jack) to be a dhcp server or client whenever I want? If so how do I go about doing that? Any ideas are appreciated. Thanks
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0answers
20 views

Ubuntu not accepting some TCP/IP connections

So I am absolutely losing my marbles here. Ubuntu 18.04.2 I have Docker + Portainer installed via a local container. I can access the portainer UI via https://ip-address:9000 However, I also ...
0
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0answers
23 views

Slow download speed with rtl8821ce on Pop!_OS 18.04

I recently bought a HP 15-da0206ng laptop and since my goal was to finally switch from Windows to Linux I installed the Linux distribution Pop!_OS 18.04 LTS which is built on Ubuntu 18.04 LTS. After ...
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1answer
24 views

Linux tool to monitor network performance

I need some suggestions about monitoring various network statistics (like RTT, Packet loss, Jitter, packet retransmission) using linux command line. I have tried "SS" command but SS command gives ...
20
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11answers
3k views

How can I ping multiple IP addresses at the same time?

I'm aware of the methods where you can run a Bash for loop and ping multiple servers, is there a Linux CLI tool that I can use which will allow for me to do this without having to resort to writing a ...
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0answers
14 views

Issues with NFS/CIFS shares and martian packets when using two interfaces

Background: I have an isolated LAN. The switch is configured with 3 VLANs Here is how my network is setup VLAN Subnet Mask CIDR Range Gateway 10 192.168....
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0answers
20 views

Manjaro not connecting to some websites

I have an issue where some network requests return ERR_ADDRESS_UNREACHABLE and others resolve successfully. Success and failure depends on the domain, for example requests to amazon.com resolve while ...
1
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1answer
16 views

how to get packets log which are dropped by rp_filter=1

I do need a log of packets which are dropped by rp_filter ... how to do this logging ? which logs how to enable.
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2answers
57 views

Other machines here in our office can't access my local website within the same network

I'm developing a portal and the main aim for this portal is for all my colleagues (whose machines are connected to the same network) to access the portal. I have tried to reinstall my apache server ...
1
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0answers
21 views

Understanding Networking Issue Ubuntu 18.04

I have a server setup where I've bonded 4 interfaces (bond1) and connected this to a physical switch. I have added this bond1 to an OVS switch ovsbr1 with VM's attached to ovsbr. It seems there was a ...
0
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1answer
20 views

Limit a VPN server's services to VPN connections only

I have a jump server and I want to put it behind a VPN, I do not want to deploy a separate VPN server and put my jump server behind it. I thought of installing OpenVPN directly onto my jump server and ...
0
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1answer
46 views

How can I upgrade a primitive Netcat shell to a fully-featured login shell with tab-completion and line editing?

How can I upgrade a primitive Netcat shell to a fully-featured login shell with tab-completion and line editing? Suppose I start a remote (reverse) shell using Netcat as follows: nc -lvp $port nc $...
0
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1answer
43 views

Policy routing with 2 NICs on the same network seems to not do anything

As noted by dirkt, I'm missing information: This is the continuation of this question, but to summarize, I'm trying to receive a lot of multicast traffic, more than one interface can handle, so in ...
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1answer
27 views

How to bind a network namespace to a interface device through a macvlan

I am trying to connect a new network namespace to a netwrok device with the following commands: # create macvlan and associate it to network device in bride mode ip link add macvlan1 link dev1 type ...
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1answer
22 views

Dig: connection timed out; no servers could be reached. But ping works?

When I try to run the dig command against either my servers IP or nameserver I get an error: root@kali2:/etc# dig q-type=soa @192.168.100.10 ; <<>> DiG 9.11.4-P2-3-Debian <<>&...
1
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1answer
45 views

Debian 'mount': same command different errors

I am trying to mount one of network share to my laptop. I am using following command sudo mount -t cifs //server.name/shared /mnt/myfolder -o user="username" However, I am getting very different ...
0
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1answer
20 views

Encrypting Wifi Password When Using Wicd

Inspired by this answer, I'm wondering if there is a (relatively) painless way to "hide" the wifi password(s) that is/are present in the /etc/wicd/wireless-settings.conf file. I travel a lot and ...
3
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1answer
25 views

Execute a command when upon receipt of a TCP connection

I would like to run a bash command when a remote connection is successfully established to a specified local open port. I have looked into netcat and socat, but I'm not sure if either have the ...
2
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1answer
66 views

Why linux allows connection on a different interface ip even if forwarding is disabled?

The system has two interfaces 1.1.1.1 and 1.1.2.1. The sysctl net.ipv4.ip_forward is either disabled or enabled but iptables -P FORWARD DROP is set. Now setting 1.1.1.1 as default route on another 1....
1
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0answers
20 views

PXE Boot: “Failed to load ldlinux.c32”

I'm trying to create a PXE server on my raspberry pi, but if I try to boot, the client shows the Error "Failed to load ldlinux.c32". This is my folder structure of the tftp folder: Here is my ...
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0answers
43 views

How to access data written in a socket without reading it [migrated]

I'm working on an embedded system having Linux. A client thread is writing some data in the socket but what server thread is reading on the other side isn't the same as it was written. Which is ...
0
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1answer
12 views

How do I check if my VM is using vhost-net driver for networking

In KVM, NIC model can be set to virtio (latest) or the older e1000 (not recommended, emulated). In virtio, one has the option of using vhost-net driver or qemu. vhost-net and qemu differs in how ...
1
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1answer
32 views

How to connect a namespace to a physical interface through a bridge and veth pair

My attempt is modeled on the this tutorial. I am able to ping from the namespace to the network if the physical interface is not assigned to the bridge. # Create namespace ip netns add namespace1 #...
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0answers
27 views

Ethernet interface not working on embedded QNX device

I have A device running QNX which I can connect to over WiFi through a netgear router but which doesn't connect over ethernet. I'm pretty sure it has to do with the netmask which is in a format I ...
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0answers
24 views

Network is down, reopening socket

I cannot bring up my eth0, I tried to call udhcpc to get IP, but it showed as "Network is down, reopening socket" and "ifconfig: SIOCSIFFLAGS: Cannot assign requested address" Can someone please help? ...
0
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1answer
49 views

What order is “/proc/net/tcp” being displayed

When you view the /proc/net/tcp or the /proc/net/tcp6 files you are able to see the open ports on the machine itself. But just wondering in what order are these entries being listed in?
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0answers
17 views

Can I turn kernel params to make the network stack using swap instead of physical memory?

I'm doing a test about high-currency, and I only have a machine with limited memory. My goal is to setup more than 10M TCP connections on this memory limited machine. It seems that the network stack ...
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0answers
16 views

How to chain two proxies, or: How to redirect network traffic from one process, to a local proxy

Here's the scenario: I have a proxy, that when Chrome is setup to map requests to, records the requests from Chrome + the responses from the real server. It records all of this in a special format, so ...
0
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0answers
14 views

Tc qdisc delay not seen in tcpdump recording

I have two linux containers connected with a veth-pair. At veth-interface of one container I set up tc qdisc netem delay and send traffic from it to the other container. If I watch traffic on both ...
1
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0answers
72 views

Disconnecting unwanted remote access

If someone is remotely connected to my single ARM board computer with Debian 32-bit OS, (example: thru hijacking the browser), which connects through a firewall on a separate Orange Pi board, and I ...
1
vote
1answer
31 views

Should the Linux kernel perform an “IGMP rejoin” on link up?

This question is almost the same as an older unanswered question found here in the kernel's mailing list (credits to Simon Paillard). Here's a (paraphrased) recap: When a host running the Linux ...
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0answers
27 views

Route requests from wlan0 to eth0 on Debian Jessy

I am trying to route requests from wlan0 (port 8080) to eth0 (port 80) on a Single Board Computer (SBC) running Debian Jessy. The device I am trying to access is a network camera. I've testing ...
0
votes
1answer
21 views

If you ssh to another device in your LAN, can you accidentally connect through a less direct pathway (WAN)?

My question regards ssh, sftp, scp, rsync, etc. commands where you connect to another machine which can be in your Local Area Network (LAN) or at some remote location you would typically connect via ...
1
vote
1answer
34 views

NTP - localhost timeout - source network uses eth0 instead of lo

ntpq -p commands are timing out for me in a centos 6 server. # ntpq -pn 127.0.0.1: timed out, nothing received ***Request timed out tcpdump result shows me that it is using eth0 instead of loopback ...
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0answers
11 views

how to migrate servers on premise in cloud whithout overlapping and changing IP

I'm trying to migrate 100 servers located in two large subnets from premise (192.166.1.0/24 and 192.166.2.0/24) to cloud. the servers have different operating systems (windows server - redhat ...) and ...
0
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1answer
21 views

What's the function of `virbr0` and `virbr0-nic`?

In my CentOS 7.2, I installed the below packages: yum install -y epel-release qemu-kvm libvirt virt-install bridge-utils then when I show ip a: [root@localhost ~]# ip a 1: lo: <LOOPBACK,UP,...
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0answers
13 views

Printer found but won't print

I have a network printer, model is Canon MF4890. I have downloaded correct drivers, opened all ports between the printer and the rest of the LAN on the firewall, and can find the printer through CUPS ...
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0answers
17 views

Two (seemingly) identical servers, but eno1 switched “off” after reboot on server 2

I have Debian 9 installed on two servers. They are identical as far as I can tell. When I reboot server1, internet comes up normally. When I reboot server2, there is no internet. I cannot ssh, ...
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0answers
48 views

How to diagnose slow upload speeds on Ubuntu Server 18.04

I'm currently running Ubuntu Server 18.04 on a home server build to act as a Plex server, among other things. I have it connected via ethernet (with a 5-port switch between it and the router), and get ...