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Questions tagged [networking]

Managing and using network connectivity on a unix system

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6 views

How to use “netatalk” to share files between my Mac and AWS EC2?

When I use the ubuntu machine at the office, a very nice feature is that I can share files in my finder just by drag & drop between my laptop and the ubuntu machine. But it doesn't work when I try ...
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0answers
20 views

Need a shell Script in Linux to telnet all ports and get the status of each port [on hold]

Need a shell script in Linux to telnet all ports and get the status of each port. I have to check for about 300+ IP's
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0answers
10 views

How does Linux actually perform protocol data unit (PDU) encapsulation?

I understand that as data goes from the upper layers (Application Layer) to the lower layers (Physical/Link Layer(s)), the data is encapsulated. When it goes back up the layers, it is decapsulated. ...
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0answers
9 views

Run pppd with custom MAC address?

I want to run multiple PPPoE accounts on my Linux machine but unfortunately, each PPPoE account requires a different MAC address and my machine only has 1 Ethernet interface (buy another adapter is ...
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0answers
18 views

Connection Refused on Ubuntu 18.10 [on hold]

I'm using Ubuntu and i just installed the 18.10 version as a dual boot with windows. My problem is that when i try to connect to certain websites likes my university's mail, i get a connection refused ...
1
vote
1answer
29 views

How to add a static route in systemd-networkd?

I have a host which is on 192.168.0.0/24 with an IP of 192.168.0.13. Its DHCP-provided gateway is 192.168.0.254. The configuration is done via systemd-networkd and the issue below is present at ...
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0answers
11 views

How to filter domains on a transparent network bridge?

How can you filter traffic on a transparent network bridge? With iptables it is possible to some extend but most of the time a proxy is recommended or alternatively something like pi-hole or dnsmasq ...
1
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2answers
33 views

How to track which process is generating network traffic?

After fresh system install (opensuse Tumbleweed) I have observed strange activity on network monitor - some app is generating small network traffic (sending and receiving data)... how to track which ...
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0answers
9 views

Tcp TCPBacklogDrop and packets pruned from receive queue

I am analyzing two virtual machines in the same LAN, tcp packet loss problem, but the knowledge has been exhausted. platform CentOS Linux release 7.2.1511 (Core) 3.10.0-327.el7.x86_64 #1 SMP Thu Nov ...
3
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2answers
33 views

Why does my NAT setup only work properly from time to time?

Homework assignment... There are 3 computers in a local network: 192.168.0.185 (the 'client'), 192.168.0.129 (the 'gateway') and 192.168.0.81 (the 'server'). The 'server' is running a HTTP server, so ...
1
vote
1answer
28 views

TFTP timeout problem during PXE boot

While setting up a PXE boot server on a CentOS 7 machine, I encountered a strange problem with TFTP. I cannot retrieve any files from the TFTP server without encountering a timeout problem. The boot ...
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0answers
42 views

lxc container has internet access, how to access internet from host

I have a requirement that networking has to be managed by lxc container, so the Ethernet interface(eth0, which is the source of internet) is assigned to container. I am able to ping "8.8.8.8" from ...
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0answers
27 views

Configuring network adapter in linux guest

I am using Windows host and ubuntu guest via Virtualbox. I have 2 network adapters configured. Both are bridged. The first one is bridged to my wifi network adapter and the second one is bridged to my ...
-1
votes
1answer
46 views

tar with ssh: what happens if creation speed is higher than network speed?

I'm concerned what will happen if speed of source read + stream create operations gets higher than underlying network protocol speed? Is tar going to create and cache data locally before it is ...
0
votes
1answer
19 views

Cannot connect to wireless wifi and cannot manually install drivers

I've been trying to set up SparkyLinux for the past hours, and I can't seem to get the internet connection working. I'm dual booting it on a USB through my Mac, and it seems that the drivers for my ...
0
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1answer
33 views

How to setup DNS manually on Linux?

In Linux /etc/resolv.conf get often overwritten when we setup the DNS, because of the multitude of programs managing the DNS servers. How to properly setup the DNS ?
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1answer
19 views

Static Routes between Multiple Subnets - ROUTER (WAN) + WiFi Mesh ROUTER

I've got a standard router (192.168.1.1) that is connected to the internet. It also has the following connected to it: an un-managed switch which all wired devices connect to. a Tenda Mesh WiFi ...
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0answers
47 views

using two or more network interface in linux (ubuntu) [on hold]

I have two or more network interface at the same time and want to use each network for sending special requests over it for example : I want to see a video by "network-1" and other requests I ...
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0answers
28 views

Using multiple wireless usb adapters (Huawei E3372) with the same mac address

If I connect two usb wireless adaptors (via a usb hub), only one of them gets assigned an ip address. I want each to be assigned a different ip address to be able to use both wireless adapters at the ...
3
votes
1answer
188 views

Why does Internet access stop if I change the IP address of a wireless USB adapter?

I have a USB wireless adapter which is eth1. When it is plugged in it automatically gets an IP address of 192.168.8.100/24 and routes automatically added: ip a output: 39: eth1: <BROADCAST,...
4
votes
1answer
25 views

Is there a file that associates a thread to its network namespace?

/proc/[pid]/ns/net contains a link to the inode representing the network namespace of the process with PID [pid]. Is there something similar for threads? My use case is a multi-threaded application, ...
1
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0answers
39 views

Issue using openvpn on Debian [on hold]

I am using openvpn. I can connect to the server as a client without hiccups but I can't use the internet. Here's how the config file looks like on the server: **The server is a Raspberry Pi in my ...
1
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2answers
26 views

Why does Asterisk open a second media port +1 above the other?

When placing a call through an Asterisk SIP server, the server will open 2 ports for every media channel: 2 ports for call leg 1 video 2 ports for call leg 2 video 2 ports for call leg 1 audio 2 ...
1
vote
1answer
28 views

Pi Hole DNS not working after configuring Wireless Access Point on Arch Linux in Bridge Mode on Raspberry Pi

I'm experimenting with a Raspberry Pi 3 Model B (running arch linux) and its WLAN module. Until today I had Pi Hole running on it for my entire network. The Pi stands where we have very poor Wifi ...
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0answers
12 views

Access usb wireless adapter from network namespace

I have a wireless usb adapter and I would like my docker container to use just this for the internet (not the computers own wireless adapter). I think I can do this if I know how to access the adapter ...
0
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1answer
15 views

Routing traffic from Windows to device on debian linux

I'm wondering if I have all the networking set up correctly for my situation on the debian computer. I have set up a pelora CL-TEN frame grabber and JAI camera on my Debian 9.5 (stretch) server. The ...
2
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1answer
65 views

How to connect to ethernet while installing arch linux?

I am trying to install arch-linux on my thinkpad following the installation wiki. I plugged in the ethernet cable, and the ip link command will show: enp8s0: <BROADCAST,MULTICAST,UP,LOWER_UP> ...
0
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0answers
47 views

Mint 19.1 Wifi Not Working

I just installed Mint 19.1 on a Lenovo Thinkpad 11e and, while everything else seems to be working well (except for one irrelevant issue), I can't get it to connect to Wi-Fi. No networks even appear, ...
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0answers
39 views

Files in /home disappeared after installing Packet Tracer [duplicate]

I was installing packet tracer on my kali machine and I extracted the packet tracer in/home and I was trying to install it in /home and suddenly I checked all the files in /home disappeared. I've ...
0
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0answers
19 views

Temporary failure resolving `mirror.fsmg.org.nz` when updating kali [duplicate]

apt update 0% [Connecting to mirror.fsmg.org.nz] Err:1 http://mirror.fsmg.org.nz/kali kali-rolling InRelease Temporary failure resolving 'mirror.fsmg.org.nz' Reading package lists... Done Building ...
0
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0answers
13 views

Getent Hosts For Port 1915/tcp -iptables

I have a scenario: i will have to protect my network from unsolicited access from my DMZ machine, configure node-A to allow new connections on port 1915/tcp from hosts (obtained by 'getent hosts node-...
0
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1answer
20 views

Block or drop DNS requests within forwarded packets

I have a default Debian 9 installed in minipc, which is forwarding packets further. I wish to be able to block hosts via domains, means if any forwarded packet of DNS type has request for example of ...
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0answers
15 views

measuring ppp traffic with ifstat

I've established a ppp link with 2 Linux machines. The speed is set to 9600. Traffic is going one way, i.e. from Machine 1 to Machine 2. However when I run ifstat -btwTWS -i ppp0 on Machine 2, I'm ...
3
votes
1answer
27 views

ip-rule doesn't work with ToS greater than 0x10

There is some weird behavior of ip-rule with specific IP ToS-values. It works fine just with values up to 0x10, but doesn't accept DSCP-part. I tried: ip ru a tos 0x20 table 1234 And got: ...
1
vote
1answer
16 views

3proxy via pptp-linux VPN

Good day. I have a situation: a computer with debian (K) is connected to the router (A), which distributes the network 192.168.1.0/24. There is another router (B) (it has a “white” ip), which ...
0
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1answer
35 views

Instagram did not return a 200 [closed]

I have an issue with WordPress Plugin for Instagram. When I use IPv6 it said: Instagram did not return a 200 But if I switch to IPv4 it worked correctly. So Is there a way to keep ipv6 but ...
0
votes
1answer
9 views

Source for outgoing connection in nethogs

I see several outgoing connections in nethogs (please see screenshot below), where my server is connected e.g. via its port 445 (samba?) to someone else. However, ss does not show any process running/...
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0answers
21 views

Access denied when accessing samba shares via a network drive in Windows 7 and 10

I have a Debian Stretch server setup for a few years now, with samba install with shares configured the shares are accessible from both windows 7 and 10 computers when using the network paths directly....
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0answers
18 views

Knockd disabled but it still intercepts packets [closed]

I set up knockd on latest Debian stable to enable pretty knocking but it didn't work reliably so I settled on doing it myself using just iptables. However, I couldn't get that to work using the exact ...
0
votes
0answers
12 views

Unable to find any visible networks in Kali Linux (VirtualBox). Tried multiple solutions. How do I solve this? [duplicate]

I have Kali Linux installed from offensive security site. The virtualbox image was downloaded. It initially said that no wireless adapter found. I used compact-wireless-2010-06-26 to solve that. Now, ...
1
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0answers
17 views

Unable to add default route via VPN (openvpn)

Initially my routing table looks like this Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.1.1 0.0.0.0 UG ...
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0answers
16 views

Routing Issue concerning VPN Gateway

I am using a raspberry with the newest stretch version and facing a routing issue. My network: LAN: 192.168.178.0/24 Subnet Mask 255.255.255.0 Default eth0 Gateway 192.168.178.1 (this network is ...
2
votes
0answers
42 views

Why would NFS have lag after a minute of inactivity?

I am running a version 4 NFS server on a Salix server with kernel 3.10.17. I am mounting the NFS share with the command sudo mount -t nfs 10.0.0.150:/share /mountpoint on my client machine, which is ...
1
vote
2answers
31 views

How to check if a packet reached an interface in a multi-interface context?

Consider the following topology: I am sending ICMP (ping) packets from host B to 10.0.1.1. They reach the target and the target answers with a reply. The connectivity works fine. When running, on ...
1
vote
1answer
38 views

ping: network unreachble although I have an IP through DHCP [closed]

I am about to install Archlinux on a root server via VNC. For installation Archlinux needs an internet connection. If I run ip addr it seems to me that I get an IPv6 address via DHCP (every reboot it'...
0
votes
1answer
26 views

Dual Network Gateway on CentOS 6.7

I have dual NIC machine running CentOS 6.7 and asterisk. First NIC is for LAN & Internet connectivity and second is for trunk provider's connectivity. Both of these have gateways configured. I don'...
1
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0answers
45 views

TP-Link TL-WN722N with Atheros AR9271 doesn't work on Debian 9 Stretch aarch64 (ROCK64)

I am trying to get my TP-Link TL-WN722N external USB wireless adapter with Atheros AR9271 working and I've tried everything I could find on the matter. I have firmware-atheros and all the firmware-* ...
5
votes
2answers
374 views

'ping' uses localhost instead of public IP address

Let's say my server has IP address 11.22.33.44 and hostname server1.mydomain.com. When I ping server1.mydomain.com, it looks as if ping is actually using the public IP address: # ping server1....
0
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1answer
39 views

Using socat to make a secure tcp connection to an irc server

Recently, I got into irc, so I installed sic and started - obviously - chatting. But, it turns out that sic doesn't provide any security features like SSL or TCP so I in man sic, they told to use ...
0
votes
1answer
39 views

How to Compile a USB WiFi Driver from source code…? [closed]

I purchased a Wireless USB Wifi Adapter with a CD-ROM and instructions. The instructions are only for Windows, but the CD-ROM has folders for Windows, MAC, iOs, and Linux. I'm using Kubuntu 18.04 ...