Managing and using network connectivity on a unix system

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1answer
291 views

ixgbe: increase rx performance

I have an Intel 82598EB 10GBE NIC. I need to receive traffic without packet loss. Data rate is 4-5 Gbps, packet size is 1500-9600 bytes. I had already configured smb and irq affinity. I also tried ...
2
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0answers
20 views

Assign Special Records for specific remote clients DNSmasq

I'd like to make DNSmasq serve special records for specific remote clients (Clients from the public internet) So for example if remote host 111.111.111.111 requests www.example.com it returns 3.3.3.3 ...
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2answers
36 views

How to know URL being observed directly in a server

I host many websites using cpanel. I want to know URL being accessed at real time. It seems that many old domains still point to my host and they seem to take a chunk of CPU
3
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1answer
107 views

Fake linux as android device

How can I let my GNU/linux completely mimic an android device when connecting to a wireless Access Point? I explain: I moved to another location and it seems that my android phone and tablet have a ...
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0answers
713 views

Linux Mint 17, Wifi Slow and Drops Connection, No Ethernet Connection

On a fresh install and updated Linux Mint 17 XFCE, the system cannot maintain an internet connection through wifi, and is unable to connect at all through ethernet. Wifi will work somewhat slowly for ...
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0answers
70 views

Opensuse 13.1 wifi doesn't work (intel k53E laptop)

I downloaded opensuse to dual boot from a CD and got everything installed. At first, my wifi was working. Then I went to school and it stopped working and wouldn't connect to anything even when I ...
2
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1answer
65 views

How is the content of configuration files parsed on different Linux distributions?

Different Linux distributions store the same configuration parameters in different files. For example IPv4 address in Debian Wheezy is stored in /etc/network/interfaces file while in Fedora 20 it is ...
2
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0answers
32 views

Want to assign dedicated default gateway on Two NIC card on linux server

We have one server having two nic cards. Here we configured two separate networks on both nics and having different gateway. However our one sub-net is able to communicate to outside network second ...
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0answers
29 views

Server load is very high with unusual iftop result

Sometimes my server load is insanely high. Things like 120 or something. I checked what's wrong. What I see can be seen in this question: How do I interpret this IFTOP result Basically when I run ...
4
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1answer
49 views

What does this netcat output mean?

I want to telnet into my locally running VM which has a dictd service running on port 2628, when I issue my nc -v command though I get the following: $ nc -v localhost 2628 nc: connectx to localhost ...
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0answers
28 views

How can I embed a console app's output into my X11 desktop?

I'd like to view NetHogs output on my desktop. For example, do any Conky or applets on Cinnamon exist, so I don't need to have a terminal open all the time?
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0answers
19 views

After adding FORWARD NAT rules, cannot connect system eth0

I was trying to make bridge connection between wlan and eth on Centos.. I made Forward and NAT rules and then something wrong with System eth0 connection. It does not connect anymore.. Could you ...
1
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1answer
76 views

Why IP address for Linux Bridge which is layer 2 virtual device?

Shouldn't bridge (or a switch) be working without having an IP address? I believe I can have a bridge br0 setup with eth0 and eth1 as members both having no IP addresses. I can't understand why an ...
5
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1answer
65 views

What's the exact behaviour of the command: ip address change?

I have been fiddling with IPv6 and address lifetimes. I found out that the valid_lft attribute will make a v6-address disappear automagically, if used correctly. To extend an address' lifetime I would ...
4
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1answer
72 views

Is nameif deprecated? If so is there an equivalent replacement?

I read that the nameif is deprecated, although I still see it on my Ubuntu 14.04 system. If this command is deprecated, is the command cited for removal or will it still be available? This command ...
19
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4answers
9k views

Throttle the download speed of wget or curl while downloading

Is it possible to throttle (limit) the download speed of wget or curl ? Is it possible to change the throttle value while it is downloading ?
2
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1answer
334 views

udev Unable to Rename Network Device: Device or Resource Busy

I'm trying to use udev rules in order to give my network interfaces static, consistent names. However, it seems like there is some race condition happening preventing these rules from consistently ...
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2answers
102 views

How to troubleshooting failing ping to router on a linux box?

I have a home network 192.168.0.x from which I am posting this message, on this network I have a CentOS7 host 192.168.0.3 which is running a DNS server for the network. I can ssh into 192.168.0.3 I ...
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3answers
88 views

Are there network connections that don't use the WiFii card or the Ethernet port?

I see many connections like when I use netstat, are they all to the internet? Are there any connections to the internet or other things that aren't forthcoming? I guess what I'm asking is what does ...
4
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1answer
4k views

Firefox: use system proxy settings, but where are these?

Running Ubuntu 13.10, Firefox is configured to use the system proxy settings, but it seems it fails to pick them up. The computer is connected to the network, and it's possible to establish a ...
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0answers
490 views

Problems with Dell Wireless 5570 HSPA+ Mobile Broadband card

I've got a new Dell Latitude e7440, and a Dell Wireless 5570 HSPA+ mobile broadband card. I cannot get the broadband card to work. I can see the card: # lshw .... *-network DISABLED ...
2
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2answers
103 views

Debugging a Solaris network issue

I'm running a Solaris 11 x86 file server. The file-server part is ZFS + Samba. It's been up running for three or four years now without major problems. The Samba shares start out visible to other ...
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2answers
4k views

Monitor mode wifi only seeing broadcast packets

I have pretty much exhausted every link I have found on google regarding this topic, and I'd like some of the most experienced eyes on the problem, because something obscure must be going on. Systems ...
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0answers
118 views

Is it possible to prevent eth0 network traffic from accessing eth1 network?

I am not really sure how this is possible but I have a linux(ubuntu 14.04) box with 2 interfaces. eth0 is connected to our lan 192.168.0.* and eth1 is connected to a dlink wifi router on network ...
2
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2answers
244 views

How to use a defined local IP instead of external one

I have a Gentoo Linux server. Server is connected to two networks: internal and external. Internal network ip: 192.168.1.200 External network ip: 192.168.0.2 If I'm trying to make request from ...
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3answers
1k views

How to setup transparent firewall using ArchLinux

I am trying to setup a Transparent Firewall using ArchLinux. My setup looks like this: (ISP, IP: 10.90.10.254) \ \ \ (eth0-> ip: 10.90.10.1 gateway: 10.90.10.254) +-----------+ | ...
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2answers
430 views

How can I create a virtual ethernet interface on a machine without a physical adapter?

I have a Dell XPS 13 ultrabook which has a wifi nic, but no physical ethernet nic (wlan0, but no eth0). I need to create a virtual adapter for using Vagrant with NFS, but am finding that the typical ...
7
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1answer
76 views

Why are there so many loopback addresses?

From my understanding, all IP addresses of the form 127.x.y.z are loopback addresses. Now that seems to be quite a waste to me; indeed, already more than one address seems like a waste. Is there any ...
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4answers
8k views

Can I create a virtual ethernet interface named eth0?

I am running Arch based on the Linux 3.10.5-1 kernel. The system uses the new de-facto naming conventions of ethernet interfaces enp*s* and wlp* etc. This is a problem however, as my educational ...
0
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1answer
74 views

What to make of system scans reported by psad

My system logs show that psad detects scans like this every minute. psad: scan detected: 192.168.1.10 -> 192.168.1.1 udp: [53] udp pkts: 2 DL: 2 If the first address is mine, and the second ...
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0answers
61 views

where is network layer protocols source code [closed]

that's all I can find tcp source code on my Ubuntu, also the place of data link layer is on the network interface. So where is network layer protocols source code on ubuntu ? Also I am looking for ...
2
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1answer
16 views

Where do I find the OID descriptions for SNMPv2 in Linux?

I was looking at this link here: http://www.debianadmin.com/linux-snmp-oids-for-cpumemory-and-disk-statistics.html and noticed that the OIDs are the same ones I see for the same stats for our ...
0
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1answer
74 views

ifconfig not showing changed ip address

I'm trying to configure IP settings on my Raspberry Pi running Rasperian. I edited /etc/networks/interfaces to be: auto lo iface lo inet loopback iface eth0 inet static address 110.76.71.106 ...
0
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1answer
87 views

Static IP addressing issue in Ubuntu on BeagleBoneBlack Rev C

I have my BBB configured to use a static IP address using the following in the file /etc/network/interfaces: allow-hotplug eth0 iface eth0 inet static address 192.168.0.1 netmask ...
0
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1answer
92 views

Ethernet does not work at all

I haven't used my NIC for some time, and now it doesn't work anymore, at all. I can assign IP addresses to it manually (sudo ip addr add 192.168.2.155/24 broadcast 192.168.2.255 dev eth0, for ...
0
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4answers
56 views

How do I find my Raspberry Pi on a big LAN?

I'm a college kid on a WPA2 Enterprise with a Raspberry Pi on ethernet. How do I find this device on the network? I could try running arp -a logging results to a file, connecting my Pi, and then ...
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2answers
49 views

Debian VM Can see other computers on the network but can't connect to the WWW

Similar to this SU question: http://superuser.com/questions/667631/network-is-unreachable-when-attempting-to-ping-google-but-internal-addresses Actually, it's pretty much the same base issue. I went ...
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0answers
35 views

Does PPPoE connection have IP before authentication?

I am debugging a connectivity issue with my internet connection provider. I have a PPPoE type of connection. I am working on configuring my router to connect over PPPoE connection. Please note that ...
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2answers
271 views

Can't access mail server through SMTP

I'm trying to send email from a server. Testing on my local machine works fine but on my production Ubuntu server, the webserver fails when trying to send email. I'm using GMail as my SMTP provider ...
3
votes
5answers
8k views

How to remove mounted locations that have been added using the mount command?

I've mounted few shared locations using the below command. mount -t cifs /mnt/systemfolder -o username=name,password=password //10.10.1.1/My-Shared-Folder A few incorrect locations* have been ...
2
votes
1answer
107 views

Fix “Route hash chain too long” without restart

On our production server (ubuntu 12.04, 3.2.0-63 kernel) routing cache reached its capacity. Modifying rhash_entries is out of the question, since it is a kernel boot param, and we can not restart the ...
2
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0answers
70 views

Wait for a network device to come up before bringing another network device up on boot?

I'm in the middle of setting up my Raspberry Pi running Raspbian as a bridge between my university's wireless network (which requires WPA2-Enterprise authentication) and my private wireless router ...
1
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1answer
58 views

How to permit any user (mysql, apache, etc) to use any TCP or UDP port?

How can I ensure that all ports are open to any user? Currently ports 1 to 1024 are reserved for "root" only. Although I am not sure why "apache" is capable of using port "80" if this port too is ...
1
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2answers
64 views

Logging in to VirtualBox via SSH

I'm starting with VirtualBox and Linux on a Windows machine. I can log in to Linux using the Virtual Box command line but I want to do something pretty easy: log in from an external (not virtualbox) ...
3
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1answer
146 views

How can I most simply transparently bridge traffic between wlan0 and eth0?

I am looking to do this on a Raspberry Pi, but I don't mind which operating system I have to install, so the easiest most out-of-the-box solution for Pidora (Fedora 20 Remix), Raspbian (Debian) or ...
4
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2answers
67 views

Redirecting loopback traffic through a router

For some tests purposes, I am running multiple socket-based applications on one machine and want to simulate "real" network conditions between them. I thought the simplest would be to redirect all ...
0
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1answer
135 views

Unable to ping CentOS virtualbox

I have created a virtual machine for CentOS in VirtualBox using an NAT connection (It wont work under Bridged). Now the problem is I can ping from CentOS to my IP on Ubuntu with no problem but I ...
2
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1answer
3k views

Fedora 20: Failed to start LSB: Bring up/down networking

I'm trying to restart my networking service in Fedora 20, and I get the following error: [dev@localhost das]$ sudo service network restart [sudo] password for dev: Restarting network (via ...
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0answers
17 views

Two way internet sharing configuration (swiching modem from one machine to another)

I have: One Raspberry Pi with Raspbian (distribution based on Debian), with one enthernet interface One laptop with windows, with one ethernet interface One USB modem Ethernet cable between Pi and ...
1
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1answer
170 views

Reboot when no network connection does not work!

I have a Raspberry Pi that I use as a NAS for my local network. It works fine, but when I turn off the router to which the pi is connected, it permanently loses the connection. To be able to connect ...