networking

networking

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1 answer

Changing the default gateway, multiple NICs

I have Ubuntu 13.10 (kernel 3.11.0-19-generic). On startup, the network configurations are as follows: dor@ubuntu:~$ sudo ifconfig -a em1 Link encap:Ethernet HWaddr 44:37:e6:4c:ca:0a …

21 mins ago
1 answer

hw csum failure

For the past 5 days, my Internet connection just drop randomly. After some researches, I found this into the syslog : Jun 25 17:01:59 home kernel: [127541.168744] eth1: hw csum failure. Jun 25 ...

25 mins ago
2 answers

512MB suddenly not recognizing USB or ethernet

I have a 512MB Model B (2012 edition I believe, possibly 2011...china made) and recently my power cord was partitally chewed through. Obviously, the Pi wouldn't boot up, as I noticed when I tried to …

1 answer

Failed to bring up eth1

We try to implement the ubuntu server as Gateway. There are two NIC cards . One is for Internet and another is for LAN. eth0 is up but eth1 is failed to up. I need to configure eth0 as address ...

1 hour ago
2 answers

Which setting in osx could block “ping localhost”?

How can I detect which setting in the OS X could block ping localhost? IPFW, LittleSnitch no such rules? Update 1: > cat /etc/hosts 127.0.0.1 localhost 255.255.255.255 broadcast

2 hours ago
1 answer

Wireless connection error for SOME networks

I have just installed Ubuntu 14.04 LTS and everything about wireless was ok until I come to work. 14.04 recognized & successfully connected to my home wireless network but it does not connect to …

0 answers

start ntpd -qg after network connection

I am trying to synchronise two machines that connected over ad-hoc network. None of the computers are connected to the internet. One computer doesn't have a Real Time Clock, so everytime I reset it, …

3 hours ago
2 answers

iwconfig indicates “no wireless extensions” for a working wifi card

I was trying to set-up a virtual wifi access point. To find my interface name I used iwconfig and it showed no wireless extensions even though I am able use my wifi card. using : Dell 1540 vostro ...

5 hours ago
0 answers

Finding the slow-start beginning and end

I have a problem for my assignment this week and it has to do with identifying where TCP’s slowstart phase begins and ends, and where congestion avoidance takes over? Comment on ways in which the ...

5 hours ago
2 answers

How to check through command line whether my internet connection is running, and to connect if not running

I have a mobile broadband dongle with a little issue. As soon as the downloaded data reaches 430 MB, the internet connection gets disconnected automatically. May be that's some kind of limit set by …

0 answers

Slow network transfer to linux fileserver

I have a raspberry pi with raspbian installed and an external hard drive attached. File transfers to it using my mac laptop with Mavericks installed is exceptionally slow, around 300 kilobytes per ...

6 hours ago
1 answer

Block wan request is on. 3CX system

I am trying to connect to my 3CX PBX on an amazon ec2 windows server 2012 instance. I have created the security group, and added exceptions in the firewall. The firewall checker in the 3CX control ...

1 answer

How to debug Remote Desktop Connection when intranet connection works, but not external

How can I setup Remote Desktop Connection (RDP) when I've exhausted all my known searchable resources? I am attempting to set up Remote Desktop Connection on my Windows 7 Ultimate version and have …

0 answers

Certain websites do not load in 12.04

Certain websites do not load on my 12.04 64 bit system.This is not browser specific issue, as websites that do not load with firefox also do not load with chromium. For instance www.hgst.com does not …

8 hours ago
1 answer

Always-On VPN option does not list my PPTP VPN

I have successfully connected to a PPTP VPN on Android. It is configured simply with an IP address, and no MPPE encrpytion. However, it does not show up under the Always-On option. I am running ...

8 hours ago
2 answers

What's so hard about p2p Hole Punching?

I am trying to experiment with some p2p networking. Upon doing some research, one of the biggest obstacle I learnt is "What if a client is behind a NAT/Firewall", later on I discovered about Hole ...

1 answer

Difficulty in understanding a http and https packet

What is contained in a HTTP packet? For example, a FTP data download request will have "RETR" content in it, a FTP data upload will have a "STOR" content in it and a FTP completed request will have a …

9 hours ago
1 answer

Routing static IPs to different machines on LAN

We have Comcast Business Class (not the same as Comcast residential) internet service running to our home in to a Comcast-provided SMC D3G-CCR cable modem. This modem is configured to serve DHCP, and …

0 answers

Can't auto connect to samba drive on login?

I have a old PC running Ubuntu server with samba and for some reason, my mac cannot connect to it automatically on login. I added the volume to the login items in system preferences but every time I …

2 answers

Object sent via ObjectStreams do not keep their field values?

I've been developping a chat client/server to get familiar with java, and I've run into a logic bug I don't understand. I'm sending an object through a ObjectOutputStream (Message object, see ref), …

0 answers

Wireless not working on Asus F552CL-SX049H

I tried Ubuntu 14.04 live on my Asus F552CL-SX049H, and the wireless is not working. Running lspci gives the following result: [...] 03:00.0 Network controller: MEDIATEK Corp. MT7630e 802.11bgn ...

0 answers

OS X / Windows bootcamp, Wi-Fi drops on OS X only

While I know there can be a vast sea of different explanations to this matter, I am trying to figure out why my Wi-Fi keeps dropping on OS X but not on my Windows(bootcamp)-partition. Symptoms: - I …

1 answer

I want to open port 8000 in my Ubuntu server 10.04 TLS

I am using a server for my applications and one of my client requested to open a port 8000 for his DVR. He wants to do port forwarding on his router so that he can access his camera's from external …

9 hours ago
1 answer

Cannot connect to wireless in Lubuntu 14.04

I have tried all afternoon to fix this, but now I give up. I am trying to set up an old XP PC with Lubuntu 14.04. It works perfectly fine, except for the wireless connection. Connecting with ethernet …

0 answers

Firewall not shutting off under Mac OSX 10.9

I'm trying to host a web site for testing on my local network using Nginx installed from brew. I've turned off my firewall to allow the port (I've tried both 80 and 8080) to be be accessed freely. Yet …

0 answers

Internet Problem in Ubuntu 14.04 , After Upgrading from 12.04

I Recently Upgraded my 12.04 Ubuntu System to 14.04 , But After Upgrading to 14.04 , I have been facing the following problems , 1) Wifi and Ethernet gets connected to the network , but I am Unable …

11 hours ago
0 answers

Why Varnish sess_timeout is so low by default?

Varnish has parameter sess_timeout(docs here), by default it is set to 5 seconds. Which means that after 5 seconds the session will be closed, and next page load will require will require extra 100ms …

12 hours ago
1 answer

Using iw to add a virtual wireless interface, getting the error “No such device (-19)”

I am trying to add a virtual wireless interface to my debian squeeze system using iw. The output of iw list is shown below: root@alix:~# iw list Wiphy phy0 I am using the command: iw dev phy0 …

2 answers

How many characters can an IP address be?

I have to create a field in a mysql table to store ip addresses. I need to know the maximum characters an ip address can possibly be. Whether ipv4, ipv6 or some other type that can render a valid ip …

12 hours ago
2 answers

How can I manually copy over files like LXDE and other apps?

I have a really old laptop which I have recently installed Lucid 10.04.4 Server on because it would not support newer versions. Instead of an ethernet cable it has an internal modem with a phone line …

12 hours ago
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