Managing and using network connectivity on a unix system

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2answers
50 views

Can not ping other nodes in private network

I am setting up a small cluster (four nodes running ubuntu14) and I have this configuration: # Internet and lab - 192.168.10.0/24 iface eth0 inet dhcp dns-nameservers 192.168.100.1 # privte network ...
0
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0answers
11 views

tcpdump: Couldn't find user 'pcap'

I am using RHEL 5.4, tcpdump is already installed also there is a user pcap but I am getting following message. [root@localhost ~]# tcpdump tcpdump: Couldn't find user 'pcap' [root@localhost ~]# ...
2
votes
3answers
3k views

How do I troubleshoot networking on Debian

Today I restarted my linux box, and following the restart, my linux box has no network connection. Here's what I've tried so far: Use an different ethernet cable that works on my other computer. No ...
35
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6answers
68k views

How to limit network bandwidth?

Problem: We are hosting an application on remote server. We need to test it with a limited network bandwidth (for users with bad Internet access). Question: Can I limit my internet bandwidth? For ...
0
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0answers
7 views

Set firefox to use non default gateway

I have 2 internet connections. One is set as default, so all traffic goes through it. Other have no default routes added, so no traffic goes through this internet connection by default. boby@hon-...
2
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0answers
12 views

Block port on boot2docker vm on virtualmachine

I have Boot2Docker image running in VirtualBox on my mac. I use Kitematic to run docker on my Mac. I have activemq docker running, on port 32769 in boot2docker vm. I have application running which ...
2
votes
1answer
22 views

Large TCP backlog in docker container, but no visible connections

In a setup with three docker instances, one running haproxy and two others running a flask-based python application through uWsgi, we run into a situation after about a day where no new connections is ...
0
votes
1answer
13 views

Debian : Monitoring if server is offline

We have a dedicated Debian X64 server, running projects and we require availability under any situation. Since last 2 days we have noticed that the server went offline for 10-15 minutes, and then it ...
5
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1answer
5k views

how to understand the routing table on an OpenVPN client

I just setup the OpenVPN and it is working as expected. However, the routing table of the client is confusing me to no end. Here is the route table: # route -n Kernel IP routing table Destination ...
2
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0answers
8 views

how do I make a SIP phone ring with sipsak?

How can I use sipsak to simulate a call so that there's an actual ring, or possibly even a sound is played? thufir@mordor:~$ thufir@mordor:~$ sudo sipsak -v --usrloc-mode --from sip:demo_alice@...
19
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7answers
91k views

How can I monitor all outgoing requests/connections from my machine?

My machine is a server so I want to ignore connections being made to my server (e.g. when someone visits my website). I want to see only connections/requests being made by my server to other places. ...
3
votes
1answer
24 views

routing between linux namespaces

I have the following network topology using linux namespaces: .--------.veth0 .--------.veth2 .--------. | ns_snd |------------| ns_mid |------------| ns_rcv | '--------' veth1'-----...
0
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1answer
27 views

Routing to the localhost, how does it work?

The output of /sbin/route -n on my Linux box doesn't mention the 127.x.x.x address range, neither it mentions lo interface. Nevertheless ping localhost and ssh localhost are working fine. How the ...
1
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2answers
983 views

No Default Gateway route for bond0 / Slave eth* interface gets IP assigned

I have set up a 4-NIC bond on my Debian Wheezy box. After a fresh boot, the system has LAN access, but cannot resolve outside host names or access outside IPs. It seems that this is because the bond0 ...
0
votes
0answers
25 views

USB wireless dongle detected by usb but interface does not come up

I have a wireless dongle based on the RTL8192EU chipset, but there doesn't seem to be any module loaded for it. This is the dmesg output when I plug it in: [ 404.321566] usb 1-1.3: new high-speed ...
2
votes
1answer
22 views

How to set a routing table that prefers wlan dhcp interface as default route

eth0 has a static IP set in /etc/interfaces wlan0 gets it IP dynamically How can I change my routing table and where would I put the command to always make wlan0 the default route so internet access ...
2
votes
2answers
820 views

reset Ethernet bonding without rebooting

I have the following Ethernet bonding configuration: old configuration: bond0 eth0 eth1 bond1 eth2 eth3 new configuration : bond0 eth0 eth2 bond1 eth1 eth3 I have made the ...
0
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0answers
9 views

Internet Is Connected But Not Working On Lenovo g580

I installed BackBox 4.6 from https://backbox.org/, but I have no internet access. I am connected via an ethernet cable but I still have no internet. I tried ping but it's not working and no webpages ...
0
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0answers
11 views

How do I use BIND in CentOS to create a link to a Print Server for a network with multiple VLANS? [on hold]

Someone smarter than me told me building my own DNS server would solve the problem of resolving hostnames across VLANS so people can easily find the print server when they're searching for them using ...
1
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1answer
3k views

Trouble switching from DHCP to a static IP on Kali Linux

When I installed Kali Linux 64bit, I forgot to set up a static IP address, and now DHCP determines my address with my router. I have already modified /etc/hosts and /etc/network/interfaces to declare ...
1
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2answers
26 views

Poor network performance between AIX 7.1 on 1 Gbit/s and SLES 11 on 10 Gbit/s

I am having problems with the network performance between SLES and AIX. I have tested the network performance from AIX 1 Gbit/s to AIX 1 Gbit/s SLES 11 10 Gbit/s to SLES 11 10 Gbit/s AIX 1 Gbit/s to ...
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1answer
46 views

Connect Docker container and host to different network

I don't know if this makes any sense, but is it possible to use WiFi in host but only mobile broadband in a docker image?
1
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2answers
18k views

How to set up an Internet Connection in Linux Mint?

My machine has wired Internet connection with Windows 7 OS. In connection properties I see service name : ispone obtain IP address automatically obtain DNS server address automatically How do I ...
0
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0answers
15 views

How can I use sipsak to send a SIP Invite to lrnlookup.telnyx.com with sipsak?

Here's what I have so far: thufir@mordor:~$ sipsak --from sip:thufir@getonsip.com --password flFl24GB5 --invite-mode lrnlookup.telnyx.com --message-mode error: for the USRLOC mode you have to give a ...
7
votes
1answer
5k views

setup kvm on a wireless interface on a laptop machine

I am trying to setup KVM in ubuntu 14.04 host machine. I use a wireless interface to access the internet in my machine. I have setup the wireless interface in my /etc/networks/interfaces as below. ...
1
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0answers
19 views

Iptables restrict all, allow multiple specified users to destination port

This great answer tells me how to prohibit all users from connecting to remote host on specified (in this case 25) port, except one user: iptables -I OUTPUT -m owner ! --uid-owner postfix -m tcp -p ...
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votes
2answers
34 views

Can not set static DNS on debian

I'm using Debian jessie and I don't have network-manager or resolvconf installed and I'm using DHCP. DHCP with static DNS First of all I tried editing: /etc/network/interfaces And adding this: ...
2
votes
0answers
14 views

Bluetooth Tethering, no IPv4 adresse at interface bnep0

I want to tether my mobile internet from my smartphone (OnePlus One, Android) to my Laptop (Debian 8). I want achieve this without using external tools. At the arch wiki page (https://wiki.archlinux....
3
votes
1answer
33 views

Linux router - Throughput speed of clients

I have a computer that is configured as a router with two NIC's, one is connected to Internet, the other is connected to the local network switch. I know that I can get the current throughput of NIC'...
1
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3answers
3k views

Split DNS (bind9), match-clients any doesn't work?

I've been fighting with this for the last few days. A few of my entries have external and internal IP's. My internal network is 10.0.0.0/8. When I nslookup pc1.clase.net internally it responds with ...
3
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2answers
16k views

why can't this CentOS 7 server see wifi connections?

I recently installed CentOS 7 as the sole OS on an Acer Aspire T. There is no GUI, as it is a server with a terminal-only interface. What do I need to do to get CentOS 7 to be able to see and list ...
1
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1answer
27 views

Use same IP for 2 Ethernet Adapters in different Physical networks

We have a Linux Panel with 2 Network Interfaces. On this Panel runs a software wich needs to comunicate to our devices in our network, and needs to be accessible from the customers network. One ...
0
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0answers
15 views

ethtool flow control icmp

I'm trying to disable ICMP directly on network cards. I have IXGBE driver 4.4.6 and ethtool 4.5 I've successfully filtered udp4 trafic with : ethtool --config-ntuple eth2 flow-type udp4 action -1 ...
0
votes
1answer
2k views

Mint 15 on Lenovo G700: wired internet not working (Atheros QCA8172)

Mint 15 doesn't see internet after installing it in dualboot with windows 8 (in Windows internet works well). My network card is Qualcomm Atheros QCA8172 Fast Ethernet (rev 10). What I did: Install ...
0
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0answers
43 views

Ethernet, wireless, adapter - what are these in my OpenWRT router settings?

I am looking at my OpenWRT settings and in Network -> Interfaces -> LAN and WAN see a lot of network interfaces. And it looks to me that there are too many of them. For example, in LAN section I ...
1
vote
3answers
7k views

D-Link DWM-156 HSPA USB Modem doesn't work with SIM card inserted

I have a D-Link DWM-156 HSPA modem, that I bought just a few days ago. The modem has drivers in its internal storage. There are Debian packages (.deb) for both i386 and amd64, so obviously I installed ...
1
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2answers
31 views

Lost in the world of VPN

The Q. If i have a server, is it possible to have that server with a VPN connection, while simultaneously having an entirely separate connection to be able to SSH to from client machine. The Why. I ...
3
votes
2answers
50 views

Assigning static IP address using nmcli

So I'm trying to give a VM a static IP address, this case has been particularly stubborn. The VM is running on a ESXi cluster with its own public IP range. I had it (sorta) working with an IPv4 ...
22
votes
3answers
35k views

what is the meaning of 0.0.0.0 as a gateway?

Can anyone clarify gateway assignment for me? What is the difference between adding gateway as 0.0.0.0 and assigning a specific ip address as a gateway?
3
votes
1answer
217 views

Using iptables to redirect all traffic to local webserver

I'm trying to redirect all traffic on my wifi router to a local webserver using iptables. I'm not sure I have got the command right and also I want to exclude the router IP (172.16.0.1) from the rule ...
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votes
0answers
16 views

How to run a function for a specific received packet? [duplicate]

I am doing an experiment for my master thesis. I want to run a function (e.g. multiply two numbers) when a specific packet is received (e.g. a packet with destination TCP port 6666). For example, I ...
0
votes
1answer
25 views

SSH DNS lookup on local IP addresses [duplicate]

As I have come to understand, SSH always goes through the process of reverse DNS lookups whether you are connecting to user@example.com or a local server calleduser@192.168.0.56. I do not know, ...
2
votes
1answer
924 views

redirect web server with no-ip and port forwarding in livebox

I want my Apache web server running on a Livebox (home router appliance running Linux) to be accessible from the Internet (WAN). I installed and configured the application noip2 on my Ubuntu PC. ...
0
votes
1answer
3k views

No IP address on VMware running centos 7

I just now installed Cent OS 7 on my VMware 8 and I am not able to connect it to a network. I checked the VM network and its mapped to the physical NIC. The same setting work like charm on my CentOS ...
0
votes
1answer
47 views

SSH takes too long to ask for password

I've seen many other questions on this subject but none seem to actually solve my problem. Like any other day, I connect to my LOCAL Raspberry Pi server from my client machine at 192.168.0.5 with ssh ...
0
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0answers
31 views

Can detect but not connect to 5ghz?

One night I found out that I could no longer connect to my 5Ghz network. It happened rather suddenly. My fear is that it's a problem with the card, because I also cannot connect on Windows. I can see ...
0
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0answers
93 views

cannot ping nodes on same ad-hoc network with certain adapters

I'm setting up an ad-hoc network made mostly of Raspberry Pis and I'm running into a problem where nodes using certain wireless adapter cards cannot interact with other nodes on the network. I know ...
1
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1answer
20 views

Add parameters to NFS mount

I try to start Android on device via NFS and TFTP. Everything goes good until Android system starts booting. Something happens with network parameters and connection falls and boot freezes [ 60....
3
votes
1answer
1k views

Arch Linux Ethernet to WiFi bridge

I want to use a Raspberry Pi running Arch Linux to extend my WiFi network. My situation is that I have a spare WiFi router that I want to use to expand my WiFi reception range as well as give me a few ...
1
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0answers
13 views

iptables routing input and forward paths

I would like to know the flow of a packet given the configuration below. Suppose that I setup an adhoc network between my android phone and a NIC on my linux box. I then setup the android phone to ...