Linux Networking refers to any networking function performed by a server running Linux. A Linux server operating as a router or firewall are the most common applications.

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11 views

Errno socket error [on hold]

Running Ubuntu 15 on windows 10 through vmvare. It seems it is general networking error. But I have no idea what could be triggered it or how to fix. Code: buildozer android debug Error: Traceback ...
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35 views

IP address blacklisted in my CentOS server [on hold]

I can not connect to my server (Apache, centos) I think my ip is blocked because changing it all works, where I can control if my ip is banned, thank you for help
3
votes
1answer
38 views

notify when a TCP port start listening

I need to be notified exactly when an application start LISTENING on any/specified TCP port. is there anything like configuring an application to log this event using a library in any programming ...
0
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0answers
26 views

Tool to detect alias IPs in a network [on hold]

I'm on the lookout for a utility or tool on linux that can give me all the alias IPs used in a network. For example, if this is what I get on doing an ifconfig eth0 Link encap:Ethernet HWaddr ...
0
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1answer
33 views

Virtualbox host only + NAT network slow

I have a Virtualbox CentOS 6.6 machine. It takes a very long amount of time to ssh (like 80 seconds), but once I log in it is not as slow. I also notice when pinging something like google.com from the ...
-1
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0answers
26 views

How would/Should one go about hard-coding a transparent SOCKS proxy into the Linux Kernel? [closed]

I'm trying to build a transparent SOCKSifying router but am having issues with very high CPU usage by the ksoftirqd process. My setup is a TP-Link WR710n router running OpenWRT where I run iptables ...
1
vote
2answers
44 views

Cannot ping centos7 host

I am doing this for the first time, so I may be missing something very basic. I installed Centos 7 on a new server and have successfully gotten the connectivity working. Now I want to be able to ssh ...
-1
votes
1answer
29 views

Linux DDOS Protection / Gateway without NAT

I need help to configure a box for DDOS protection and provide external ip addresses to "internal" (which aren't really internal) servers. I have 32 IP addresses from my ISP. I want to configure a ...
-1
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0answers
23 views

Create a new routing table [closed]

I want to route packets from a specific ip address through a specific device. I am going to do something like in ...
0
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0answers
17 views

Changing source MAC address of routed packets

I have linux box with one network interface and IP forwarding enabled. Let's say my IP address is 192.168.1.1 and MAC is 11:11:11:11:11:11. When a packet which is not targeted for my host arrives, it ...
-3
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0answers
46 views

Default gateway is not reachable [migrated]

I have a vmware player on which i have installed CentOS 6.5. And on that CentOS 6.5 i have installed lxc and on that lxc i have installed centos 6.3. I am using NAT and bridger as a Network adaptor ...
0
votes
1answer
22 views

Server abandons set static ip and returns to dhcp given address

I have a few virtualized (ubuntu 14.04 LTS) servers under KVM that I'm trying to move to an ip block other than the one reserved for servers under dhcp (the 10.10.2.0/24 block). I change the ip and ...
0
votes
0answers
19 views

iptables configuration for SSDP discovery

I'd like to configure iptables to allow SSDP discovery. SSDP works by sending a multicast UDP packet to 239.255.255.250 on port 1900, to which each UPnP supporting machine in the local network replies ...
4
votes
1answer
77 views

CentOS virtualbox no icfg-eth1 when adding secondary network interface

I have a CentOS 6.7 minimal distribution which I created in virtual box. As an afterthought, I added a secondary network interface in virtualbox, so I have an NAT interface, and a host-only local ...
0
votes
1answer
15 views

Nginx Load Balance / Proxy to Upstream with Path / Rewrite

Basically I have a API farm as 192.168.1.1, 192.168.1.2, 192.168.1.3 However the endpoints have different folder structure (3rd parties which i can't amend!) So basically I want to have a nginx ...
0
votes
1answer
46 views

Linux DMZ in a Windows Network

I'm a wet-behind-the-ears reluctant sysadmin, so I'm playing catch-up here. I've come across the term DMZ before, but I never looked into it until just recently. In fact I'm still not sure exactly ...
0
votes
1answer
41 views

Linux multiple gateway with single desination

I have a very strange issue. First I will like to explain you about layout of my system. I have one server which will connect with 2 motorola radio as USB but they are actually network interface and ...
2
votes
0answers
20 views

IP Forwarding Configurations [closed]

I am testing ip forwarding to recieve external connections from my computer at home. I did the following from my router settings: Turned off firewall of router and fedora, done forwarding settings, ...
0
votes
1answer
58 views

How is device to send a response packet selected

I read that when kernel determines a source ipv6 address for the packet, it takes into consideration what interface will be used to send the packet, (http://www.rfc-editor.org/rfc/rfc3484.txt, ...
0
votes
0answers
7 views

how to read Intel Flow Director entries on the card in Linux

Is it possible to get active Intel Flow Director entries from a network card in Linux? The card uses i40e driver.
0
votes
1answer
27 views

iptables-save syntax

My goal is to automate my iptables config, so while analyzing my current iptables rules setup on my local box for reference I get the following when using iptables-save > ./iptables.save; cat ...
0
votes
1answer
21 views

barnyard2 for snort permission denied

I installed barnyard2 for snort, but when i run command below this error appear. [root@localhost snort]# barnyard2 -c /etc/snort/barnyard2.conf -d /var/log/snort/ -f snort.log -w ...
-1
votes
2answers
20 views

ipvs status and netns?

Is the IPVS effort dead? I can't find docs newer than 2011, and most docs are ca. 2004. It does some interesting things, and I'd like to figure out how to make it work across netns. Specificallty, ...
1
vote
0answers
14 views

iptables rule limiting the number of connection in a broken pipe case

I am limiting the number of SSH connections using iptables but in case of, for example, a broken pipe (computer goes sleep mode, network problem, etc.) I am no longer able to reconnect. The rule I ...
3
votes
1answer
116 views

how to realize a traffic volume limit with linux

I am helping to organize a little conference. There is no internet connection, so we are limited to a mobile LTE connection with a limited volume. We have a Ubuntu-based server that acts as a router, ...
0
votes
1answer
16 views

How do I troubleshoot a VPN connection that won't forward DNS requests?

How do I troubleshoot a VPN connection that won't forward DNS requests? My network configuration without the VPN running works as desired. I have a Centos front-end NAT'ing outbound requests via ...
-1
votes
1answer
34 views

Apache tomcat works temporary - restart iptables for work

I have an apache tomcat installed on CentOS linux on a VPS. I have opened port 8080 in iptables so that it will be visit-able from outside. My problem is that when I go to address example.com:8080 it ...
0
votes
2answers
29 views

iptable alternatives debian VPS

i am confused that i dont find any soloution... i will configure an reverse proxy and that with iptables for my gameserver on debian: Kernel: 2.6.32-openvz-042stab108.2-amd64 iptables -t nat -A ...
0
votes
0answers
16 views

network link aggregation centos7 issue

I cannot ping/connect to "Team device IP". Below are steps I took to create link aggregation on Centos7.The slave ethernet are up and i can ping successfully before .what am i missting here? # nmcli ...
1
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0answers
18 views

vnstat output giving different results

I ran vnstat -d and vnstat -m and compared the results to vnstat --dump. The values between daily and monthly are off by several bytes. Is this expected? I would imagine last months data and ...
2
votes
2answers
43 views

iptables setup forwarding between two ethernet interface

I want to create a gateway on linux which has 2 interfaces eth0 and eth1. Eth1 is created by a lte modem and once the lte modem attaches to the network and gets an ip address. Then a dhcp server is ...
0
votes
1answer
34 views

How to diagnostic internet access failure on a linux system?

I have a VM running on Xen. The virtual machine was running fine for months and suddently the network access broke down. Dom0 DomU .-------. bridge ...
0
votes
1answer
12 views

Opening a port to access a service in an isolated LAN

There is an isolated LAN (completely isolated, does not access outside and outside can't access it). But one of the server has 2 NICs, one of which is on our dev LAN and the other one in the isolated ...
0
votes
1answer
52 views

iptables TEE UDP traffic to a different subnet

I'm looking for a way to replicate UDP traffic received by one host to another host in a different subnet. The TEE target in iptables only works with gateways in the same subnet, i.e.: On the ...
3
votes
0answers
87 views

Hyper-V lost synthetic NIC after Debian 8 dist-upgrade?

I'm running a Debian 8 vm on Hyper-V (Win Srv 2012R2) and when I did a dist-upgrade of stable, I lost all network connectivity. Using the console, I was able to see the network interfaces as UP but ...
1
vote
1answer
16 views

google api block request

We are using Google Adwords API to query out data. But the problem is that : After about 5 successfully requests , Google don't ACK to our SYN request as the image above. Did anyone face with ...
1
vote
1answer
38 views

Port forward linux iptables

My current network setup consists of a physical nic eth1 receiving my public ip from the modem. Next I have kvm/qemu virtual machines running on a virtual network using the ip range 192.168.122.0 - ...
0
votes
0answers
34 views

Captive HotSpot, Apple login callback issue

For some days I have been building a Wifi captive hotspot, from scratch. My question concerns Apple. It is working 90%: when I join my Wifi hotspot, the device (iPhone, iPad, Mac) displays a 'fake ...
0
votes
0answers
18 views

DNAT not forwarding to correct (local) IP address

I'm trying to port-forward a HTTPS service which uses different SSL certificates for each of the several IP addresses on the machine. Web server listens on each IP address on the internal port (444) ...
0
votes
1answer
32 views

Samba restart vs mount.cifs

My question is more about ensuring rather than an exact problem. I have a samba server (4.1) and I have a Linux client, which connects using this mount command: mount.cifs $SHARE $DIR -o ...
0
votes
1answer
93 views

OpenVPN server and client configuration for openwrt

I have an OpenWRT router with WAN(eth1) and LAN(eth0) interface. I wanted to install an openVPN server on this router, so I could access from the WAN side into the LAN side. My LAN(eth0) has a DHCP ...
1
vote
2answers
55 views

setting up linux router

I have setup three Ubuntu VMs in vmware. These are connected as: Now I want to use UBUNTU2 as router, so that when I run these commands in UBUNTU1, I get response from UBUNTU3, commands: ping ...
0
votes
1answer
19 views

How do you sync ipset sets across two machines?

I would like to replicate IPSet sets from one machine (server01) to another machine (server02) using rsync or btsync or something similar. Is that possible? If so how do I do it? This is a redundancy ...
0
votes
0answers
16 views

No package transfer from host to guest on KVM

I want to assign external static IPs to my KVM guests. I do not prefer a NAT solution. What should be the configuration of network and routing tables? I manually assing a static IP to guest. I can ...
0
votes
1answer
32 views

Iptables time-based rules having no effect - Gateway with 2 NICs

I have a network with the following topology: - WAN Modem with NIC facing the gateway: 192.168.0.1 - Ubuntu 14.04 gateway with two NICs: 1) Eth0 (facing the modem): 192.168.0.201 2) Eth1 (facing ...
0
votes
1answer
73 views

How to use conntrack to allow SIP traffic

I have the following problem: Device (eth0)----> SWITCH(trunk)+VLAN120 ---> (PC1) +VLAN200 ---> (PC2) I am able to ping from PC1 to PC2 which are in ...
0
votes
1answer
41 views

Gateway can't ping client

I try setup a new gateway in my virtual network. But sure I' have a problem. The Gateway cannot ping client but client can ping other client and gateway. So I have check my iptables rule (I does'nt ...
0
votes
0answers
39 views

Captive portal OAuth

Im building a large network of AP with captive portal deployments, each AP has its own internet connection, managed by routers I don't have access to. I can manage the APs through a cloud ...
0
votes
0answers
33 views

CIFS Input/Output error when executing set attributes

I have a CIFS share. It works perfectly with Windows, but if I want to create a file on the share, using Linux, it returns an I/O error stating that it could not set the attributes: $ touch a.txt ...
2
votes
1answer
45 views

Simulate 2 clusters in the same network

I have 4 pc´s and another pc, which will act as a proxy, all being in the same network: 172.16.96.0/20 . I can ping between each other. But, I want to separate them into two groups. That is: pc1 is ...