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Questions tagged [interface]

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1answer
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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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0answers
27 views

Forwading trafic from dns0 to eth0

So i have a problem for forwading trafic from dns0 interface to eth0 interface. dns0 is the iodine interface. Ip is 10.0.0.1 eth0 is the web interface. Ip is 192.168.1.250 (and router .254) there is ...
0
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1answer
60 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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1answer
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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2answers
87 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 ...
0
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1answer
42 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
25 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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0answers
54 views

Config ASA with SDWAN router behind broadband cable modem

Having problems getting an ASA 5508-X to route traffic to an SDWAN box. The WAN connection on the SDWAN box is part of a /29 public address block. But apparently it NATs to our internal private block. ...
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0answers
26 views

How to emulate a network adapter with a different IP

I have a computer with a 192.168.70.x/24 IP (eth0) connected via some routers / gateways to some 192.168.40.x IP cameras. My routers are all set up such that I can ping the cameras fine; however, the ...
1
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1answer
684 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 ...
1
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1answer
308 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
47 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 ...
0
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1answer
83 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, ...
0
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1answer
371 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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2answers
394 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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0answers
110 views

Why i dont see traffic in a bridge with tcpdump?

I have created a dummy interface (vnet), I have assigned a MAC address, an ip address, and I have added it to br_untagged bridge (see image). The state of the interface in the bridge is FORWARDING. I ...
0
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1answer
461 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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0answers
222 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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0answers
27 views

Access individual interfaces using internal IP and specified port

I am trying to create a proxy server (?) with multiple interfaces that have access to the internet. The proxy server is hosted on my RPI and I wish to use its internal ip followed by a specified ...
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0answers
46 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....
7
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2answers
12k 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
148 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 ...
1
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1answer
279 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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2answers
44 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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2answers
52 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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0answers
21 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 ...
0
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1answer
74 views

Efficient Python lib to query the RUNNING state of given network interface on Linux?

I want to monitor the RUNNING state of a certain network interface in an efficient way, without constantly calling ifconfig every second, or so, and parsing its output. So I'm asking if someone knows ...
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0answers
159 views

Interface combinations implementation without firmware update wireless linux networking

I am working with the Qualcomm WiGig (60GHz) chipsets supported by the Linux networking wil6210 driver. I use Linux kernel 4.12. In my use case, I would like to use concurrent usage of the WiGig ...
0
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0answers
97 views

Centos 7 guest vm has no network interface

I have installed a centos 7 core virtual machine (x86_64) in headless mode on a centos 6 host (x86_64), usint oracles virtualmachine . My problem is that only loopback adress is present, and eth0 is ...
0
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2answers
228 views

Cisco 1921 & Interfaces, and WAN IPs

Would it be possible to have more than 1 WAN IP on a single interface on a Cisco 1921 router? (This is an actual argument going on with another engineer haha). From my understanding, you would need ...
1
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1answer
119 views

Connecting to same router over multiple ethernet ports

I have a Debian Stretch server with a network card. I want it to connect to my (normal configured standart DHCP) Router. So normaly i would say something like iface eth0 inet dhcp. But i have a ...
0
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1answer
101 views

What's the rtnetlink behavior if adding or removing ethernet to/from bridge?

While I am studying on RTNETLINK, I understand that the kernel will send RTM_ADDLINK or RTM_DELLINK if interface is added/removed at kernel space. However, I have a question regarding to the RTNETLINK ...
0
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0answers
114 views

Routing traffic in a multi-interface setup in Linux

My first post on StackExchange, hello. There is a Linux 4.4.x box installed at a clients location (part of a two-box master/slave cluster). For this question only one box "the box" is relevant, the ...
0
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1answer
308 views

how to find the timestamp that an interface flapped

could you please advise on how I could see when was the last time that an interface has flapped on a linux host ? (centos, if it makes a difference) i have tried the following: ethtool -S eth0 ip -s ...
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1answer
55 views

Problems creating a static route (or any route)

I have been using this website to read about routing tables and static routes, but I can't seem to get my own static route going. Here is the situation: -> PC: 1x Wifi NIC 192.168.1.19 with mask 255....
2
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0answers
303 views

Tap interface is not receiving packets

I'm configuring a tap interface and trying to send and receive packets through it, i configure it like this: ip tuntap add name tap0 mode tap multi_queue ip link set tap0 up i'm using scapy to send ...
3
votes
1answer
2k views

How to hook an Ethernet over USB connection up to the host-Network?

I have a single board computer that I want to hook up to my lan/internet connection. The SBC doesn't have an Ethernet port, only a an embedded wireless chip which currently isn't working. But it does ...
0
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2answers
746 views

NAGIOS - Alert when low bandwidth usage on linux interface

I have Nagios running and monitoring devices by snmp. I need to monitor bandwidth usage of a Linux server interface and send an alert when its below from 100kbps of usage. Are there any plugin to do ...
1
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2answers
850 views

Creating more than 20 VXLAN interfaces on linux

How can I create more than 20 vxlan interfaces in Ubuntu/Debian? In Linux kernel 3.16 I found that I can create more than 20 vxlan interfaces but they will not work properly as in sending arp ...
12
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2answers
23k views

Specify route to an interface in Windows cmd

I have a computer with 2 network interfaces. One interface is connected to LAN network with IP 192.168.0.254, and the other is connected to a recorder server (192.168.0.233). 192.168.0.10 is the ...
2
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1answer
405 views

Traceroute time is too long

I m using RHEL 6.5 and eth0 interaface Interface Ip is 100.x.x.x and when i traceroute to 100.x.x.x it showing one hop that too ip address of interface itself. For eg traceroute to 100.65.111.14 ...
0
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1answer
81 views

Set the default interface for routing / traffic

I have a Windows 2008 R2 (or newer, doesn't matter) server with IP 192.168.68.14/24 on interface "Ethernet0" / index 12. When adding the IP address 192.168.68.222/24 the interface 192.168.68.14 is ...
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0answers
185 views

Maintain Internet Access after Bridge Creation

Simple Issue: I cannot ping the Internet after creating a bridge on a mesh node. A Raspberry Pi mesh node, part of a batman-adv mesh network and set up as an access point with hostapd, cannot access ...
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3answers
171 views

Network card goes down when the other goes down as well [closed]

I have debian 8 with two network cards, eth0 and eth1. eth0 is 192.168.3.43 and eth1 is 192.168.3.44. Both are configured by dhcp: auto eth0 iface eth0 inet dhcp auto eth1 iface eth1 inet dhcp ...
1
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1answer
218 views

I'm unable to change network interfaces' metrics in Linux

I am trying to change the priority of network interfaces on my server using ifmetric. When I execute the command it looks like it worked (exit code 0), but it simply won't affect the interfaces - in ...
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1answer
236 views

Openvpn server route traffic for everybody except for himself?

I want to set a subnet to subnet vpn gateway with Openvpn which should look like this: [gwA]===[devA1]===[ovpnServer]<---vpn--->[ovpnClient]===[devB1]===[gwB] [gw?] are default gateways of my ...
2
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1answer
349 views

Application iptables rule with virtual interfaces

If I have two or more network interfaces, ranging from virtual and real, as it could to set iptables rules to affect all of these interfaces? Example: I have four interfaces, eth0, eth0:0, eth1 and ...
0
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1answer
263 views

Set large buffer/queue on a network interface to emulate bufferbloat

I want to emulate large buffer delay on a specific interface. I have a simple dumbbell topology like: PC1 eth0 <-----------------------> eth0 PC2 It would be good if I ping PC1 from PC2, ...
0
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1answer
247 views

Routing between virtual interfaces on debian GNU/Linux

I have some hard time with routing between two virtual interfaces. Here is the setup. 1 physical interface (eth0 192.168.1.51) 1 alias interface (eth0:1 192.168.10.1) 1 alias interface (eth0:2 192....
0
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1answer
525 views

Assign Entire IPV6 /64 Subnet to Network Interface [duplicate]

So i just purchased a linux (centos) server with /64 IPV6 subnet. I want to use these IP's for outgoing requests especially. How on earth can we add that many IP addresses to the network interface? ...