Questions tagged [interface]

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Unrecognized utun# interfaces on my Mac

I noticed a bunch of unrecognized utun# virtual interfaces on my Mac OS Catalina. I don't use any VPN so I wonder where they come from and is it safe to remove them? utun0: flags=8051<UP,...
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25 views

Virtual private server doesn't see physical network interface

I rent a VPS based on KVM. VPS works on Ubuntu 14.04.6. Recently, after my VPS was migrated to another physical server I've been getting an error "No route to host" when I try to connect via SSH. I ...
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1answer
12 views

Virtual network interface in Windows

i am trying to setup a VPN server tunnel on my windows PC so that i can connect to it using remote client VPN hence routing traffic through that tunnel client = android
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Multiple interfaces on one NIC

I managed to install Debian on my Banana Pi R2. This device has two physical NICs: one for WAN (1 port), one for LAN (4 ports). eth0 eth1 if I run ip address, I can see, that there are multiple ...
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“tunX” interface device sequence is incrementing with every “ssh” connection

We use ssh -w connection to create tunnels from client workstations to the server. -w creates a tunnel interface for that particular ssh connection. On the server side I noticed every time ssh re-...
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Windows Firewall - Block all incoming traffic on Interface 1

I have a Windows Server (2019) with two interfaces. The first Interface is for Internet access only and the second for management only. Now I want to block all incoming connections on the first ...
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1answer
28 views

iLO Interface connections of storage device in the server rack [closed]

I have a setup of 3 racks. In each there are 2 storage server (HP DL560 GEN8) and 4 compute server (HP DL360 GEN8) and 2 control planes (HP DL360 GEN8) and on top of the rack 2 patch panels. Above all ...
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Docker Container with different VLANs

I have different Docker Containers running on a Ubuntu 18.04.4. Ubuntu is running in a vm environment. I assigned two network interfaces on different VLANs to the Server. Now I would like to assign ...
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10 views

Amount of incoming and outgoing traffic is different on tunnel interface

I'm running Linux CentOS and are trying to understand some things. I have a tunnel interface and only one single ip rule which directs all traffic from that interface to another server. It seems ...
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1answer
142 views

Configuration to use choose the hardware interface for the request?

I have a linux machine (Debian 10 based OS), with 3 hardware interfaces connected to the internet, 2 being USB modems: ifconfig gives -> eth0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 ...
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1answer
45 views

NAT happens before routing

I am currently building a private cloud cluster using Proxmox. My cluster contains a head node and two compute nodes. My head node hosts a NAT server and openvpn server, and three NICs: one for ...
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29 views

Use local interface address for firewall rule

I'm setting up a firewall for a connected device running Linux. It has a wired/wireless interface to connect to the internet in general and to open a VPN tunnel to an external server. For security ...
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101 views

Create Multiple Bridges in Windows Host to be Used by QEMU VMs

I have setup a QEMU VM with two TAP adapters (i.e. I have two adapter interfaces in my VM), and I am using OpenVPN's ethernet TAP driver to get such adapters. I have two NIC cards in my host machine, ...
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How can I put a WiFi client and an Ethernet client to the same group?

I have wireless interface wl0 and ethernet interfaces eth0, eth1, eth2, eth3 all in the same bridge br0. Now I have to put one of the wifi clients and one ethernet client to the same group so that ...
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46 views

Is there a way to alias a specific interface ip?

I've got a VCS running on debian as prod server, and due to some hypervisor issues it had to be rebooted/migrated/updated several times in the past week. Because i'm running my app using docker ...
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How to force the use of an ip of my server [duplicate]

How to force the use of an ip of my server eth0:1, if my server interoge example google.com when i use my php scripts, the ip that google must see is eth0:1 # The primary network interface auto eth0 ...
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29 views

openvpn: pass client's traffic through other interface than the one used for connecting to openvpn server

I'm trying to setup a raspberry pi running raspbian to act as a vpn server. I successfully installed OpenVPN and got it running following this guide: https://www.digitalocean.com/community/tutorials/...
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64 views

how to get 2 internet connections working

It's either I have a fundamental misunderstanding on how interfaces are suppose to work or I've done something oddly wrong. I have two interfaces: eno1: 10.6.59.203/24 (gateway 10.6.59.1) eno2: 192....
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Setting up openVpn as an interface rather than routing all traffic from paid vpn

I have subscribed to a VPN provider that's provides openVpn config files. Now instead of routing all traffic through this VPN, I would like to simply set it up as another interface where the ...
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99 views

Predictable network interface names doesn't work

I have a problem with moving into predictable network interfaces - if i rename eth01 into enp1s0 - can't login (interface doesn't starting up). I checked /etc/default/grub for net.ifnames=0 - not ...
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46 views

Why IP address on disconnected interface still available?

I have a server with two network interfaces which configured to work in the same network, for example: 10.0.0.100/24(eth0) and 10.0.0.101/24(eth1). I connect physically to network only eth0 and then ...
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56 views

I've Encountered A Strange Network Interface. Is This A Standard Practice?

I am currently developing ONVIF software, and one of my test cameras has presented me with a rather odd network interface. The camera in question is an AXIS M3045-WV. It's a fairly low-cost (for AXIS)...
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1answer
129 views

Creating network interface with no IP address on CentOS 7

I'm creating a Kubernetes cluster and using MetalLB (https://metallb.universe.tf/) as my load balancer. I've managed to configure everything to work for internal IP addressing but then wanted MetalLB ...
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24 views

How to get secondary interface working on AWS?

My VPC is 10.0.0.0/16. The default routing table associates 0.0.0.0/0 with an internet gateway. Subnet A is 10.0.0.0/24 and uses the default routing table. Subnet B is 10.0.50.0/24 and uses an ...
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ifconfig shows UP while ip link shows DOWN

I am looking at the state of an interface on a Linux system. When I use the ifconfig command it shows that the link is UP. master $ ifconfig docker0 docker0 Link encap:Ethernet HWaddr 02:42:b9:25:...
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154 views

Routing from one server to another with different interfaces

I have this topology Server A: eth0 IP: 10.10.20.11/24 and 10.10.20.13/24 eth3: 88.x.x.x (vlan with id 10) primary gateway: GW2 (10.10.20.3) Server B: eth0 IP: 10.10.20.23/24 default gateway: ...
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78 views

How to connect two EC2 instances using the eth1 interface on both instances?

I have 2 EC2 instances running Ubuntu 18.04. I've attached an additional network interface "eth1" to each instance, so each instance has 2 interfaces( eth0, eth1). eth0 is the default gateway. What I'...
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1answer
2k views

Alternative to /etc/network/interfaces on Ubuntu 18.04

In ubuntu 18.04, I found that there is one more requirement for the /etc/network/interfaces configuration to work. I got information that I could fix it by adding the ifupdown setting to the /etc/...
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141 views

How to route between two interfaces?

I use a wireguard (a VPN) to connect to a server. This server has two interfaces (of interest for my problem - all the others are virtual ethernet links to connect to containers, no problem with these)...
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1answer
31 views

2 physical interfaces change the link to a different interface name, on reboot

Environment: I have two physical network interfaces on my system: Qualcomm Atheros Ethernet Realtek Ethernet (RTL-8169) On the system, i have Ubuntu-18.04. Problem: I have configured: Realtek ...
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1answer
127 views

Can not create sub-interface in Cisco CGR 1240

I follow a tutorial, there shows the method of create sub-interface: but in my actual situation, I can not do this: Router(config)#interface gigabitEthernet 2/1.100 ...
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83 views

Can I change names of network interfaces arbitrary?

I have installed OpenWRT on VirtualBox. There are four interfaces: br-lan eth0 eth1 lo Why do they call that way? Are they variables? Can I name them arbitrary? foo-bar xyz0 xyz1 bo Like so: ...
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302 views

Use non default route as non privileged user

On Ubuntu 16.04, the default route for IPv4 is an interface other than eth0. If I try to curl -vvv --interface eth0 v4.ifconfig.co I get * SO_BINDTODEVICE eth0 failed with errno 1: Operation not ...
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77 views

windows 10 ip route not working for modem usb 3G

i have 2 interfaces: 1 .- Cable ethernet 2 .- USB modem 3G, The problem is i cannot work with both at same time, routing seems not to be working for me... I cannot nake this work: 0.0.0.0 ...
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1answer
26 views

Obsolete browser to access old switch and other apparatus

Sometimes I need to log in to old network apparatus web interfaces, that either have https with unsupported ciphers or need java plugin in the browser. With recent versions of Chrome, Firefox or IE ...
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1answer
3k views

configure trunk interface in linux centos7

I have connected 2 trunk interface to server(centos 7 server) nic port for setup vlan tagging. And have enabled 8021q module in server. Configure two physical interfaces as bonding as below ...
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1answer
536 views

What is this virtual interface? And how can I remove it?

I am using RHEL 7.4 and had both a virbr0 and virbr1. I want to remove them both. I was able to remove virbr0 by stopping and disabling the default virtual kvm. libvirtd isn't running, yet I still ...
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1answer
67 views

Ip forwarding - multiple subnets, multiple Ethernet ports

There are plenty of examples on here of how to forward ip traffic on a linux machine, and a few examples of how to forward traffic from one interface to another. However, most of the latter examples ...
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1answer
490 views

Disable SMB on specific interface windows

I've got an smb share on a computer connected to a 10.0.0.0 network and an 192.168.0.0 network, and I only want smb to listen on the 10 network. Not just setting up a firewall or something like that, ...
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813 views

Linux/Ubuntu bridge causes tcp retransmission and DUP ACK

When I do configure a network bridge on my Ubuntu server I got each packet to be retransmitted and getting many duplicate ACKs... as this wireshark image my bridge interface config is: iface enp5s0 ...
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3k views

Route only packets from specific interface over VPN

So i have 3 interfaces on a host: Interface 1 is facing the external network interface 2 is the tun0 vpn interface interface 3 the local network interface My goal is to route all the traffic from ...
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1k views

Nagios Disable service check if host unreachable

When I've declared the host, I specified a command to check if my host is alive (simple ping) : hostgroups hostgroup-WIN check_interval 1 retry_interval 1 ...
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347 views

how to name SR-IOV Virtual Functions

When an SR-IOV Virtual Function (VF) is created, the Linux kernel names it ethX, with X being the lowest available index among Ethernet interfaces. Is there a way to control such naming? For ...
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65 views

My Windows Server Has IP Address That We Don't Know How Its added

We use windows server 2016. We were checking our ip list and found one ip that has a ssh connection open but not related any of out linux servers. We looks hours to determine which server is using it....
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38k views

Network issue. Ifup says unknown interface

This is the output of ifconfig # ifconfig enp0s3 Link encap:Ethernet HWaddr 08:00:27:ef:b6:e6 inet addr:192.168.2.3 Bcast:192.168.2.255 Mask:255.255.255.0 inet6 addr: fe80::...
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1answer
237 views

Forwarding port 5000 traffic from one interface to another one

I'm trying to give public access from outside my network to a specific device (10.1.1.12) inside my network, using port 5000. I have a PC acting as a firewall between my gateway and the devices ...
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1answer
546 views

simple bash script to check if tunnel exists [catching stdout and stderr]

i'm trying to write a simple bash script for a cronjob to check if some interfaces (tunnels) exsisting. if not i'd like to start another script that (re)starts them. my problem is: i don't get the "IF"...
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61 views

Can only bring up one interface at a time

I took a look at the most relevant question, and am a step further but am not sure where to go from here. I am currently trying to connect two ethernet interfaces but am having trouble establishing a ...
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54 views

intra ethernet interface of a router

Please I need some clearification. Is it possible to ping from one interface of a router to another interface of thesame router ? Assuming router R1 with LAN interfaces e1 and e2. can i ping e2(...
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43 views

Slave interface receiving packets but not bond. Why?

I have 2 network interfaces with mac aa:aa:aa:aa:aa:aa and bb:bb:bb:bb:bb:bb When i bind them the bond gets the mac aa:aa:aa:aa:aa. I make a configuration where i make sure all the replies of icmp ...

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