Networking :: Pppd Nomagic To Stop Loopback Errors?
Oct 16, 2010
QUESTION: Where do I add "pppd nomagic" to stop analog modem loopback errors? (I am using Gnome PPP.)BACKGROUND INFO:I am using Ubuntu LTS 8.04 on a laptop and have an analog modem connected via USB serial cable. The 8.04 dialup and the analog modem work flawlessly.Modem disconnects when using Ubuntu LTS 10.04.1 Live USB:I am testing LTS 10.04.1 on a live USB drive that I purchased preinstalled from On-Disk.On the live USB drive, I am able to get a dialup connection with my ISP long enough to pull up a web page with the browser. However, the analog modem disconnects within minutes with exit codes 16 or 17.an pppd:16 The link was terminated by the modem hanging up.The PPP negotiation failed because serial loopback was detected.
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Oct 23, 2010
I have a couple of questions for anybody willing to answer them. I have a GSM modem with a t-mobile SIM card that I am currently trying to use to connect to the Internet. I am using Lucid amd64 machine.I have been running wvdial with a baud rate of 115200 with much success getting the output below:
Code:
sudo wvdial
--> WvDial: Internet dialer version 1.60
[code]....
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Dec 14, 2010
I am using kppp in ubuntu10.10 to connect via my samsung c3010 mobile and Airtel connection. But when I dial through it, it terminates on signal 15! Some requests are rejected it seems. I am pasting the log:
Dec 14 20:08:02 pratik pppd[1883]: pppd 2.4.5 started by pratik, uid 1000
Dec 14 20:08:02 pratik pppd[1883]: using channel 5
Dec 14 20:08:02 pratik pppd[1883]: Using interface ppp0
Dec 14 20:08:02 pratik pppd[1883]: Connect: ppp0 <--> /dev/ttyACM0
[Code]....
I am connecting the modem over USB. The GUI shows me it is dialling the number, and then connecting to the network, and after a while ( it sends it 9 times it seems) it terminates.
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Nov 26, 2010
I'm looking for a tutorial on how to create a simple pppd tunnel between two machines. I've found alot of tutorials about pppd over ssh (using the pty option) but for the purpose I just want a simple pppd tunnel.
Specs
host 1: lan ip 10.101.10.20 running slackware 13.0
host 2: lan ip 10.101.10.21 running slackware 13.1
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Apr 3, 2011
I can connect to Strongvpn (pptp) through command line call 'sudo pppd call stongvpn' followed by' route add default dev ppp0'. Everything works well.I would like to set this up on start up. I use kde. I have set up basic /etc/init.d/strongvpn script which gets called at boot and creates ppp0 but the route command does not seem to work. When I use command route add in terminal the connection comes up.Here's my /etc/init.d script
#!/bin/bash
# chkconfig: 345 85 15
pppd call strongvpn
[code]....
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Oct 6, 2010
I followed the instructions given in the link below in order to connect to a VPN server from my Ubuntu 10.04 PC.
[URL]
As mentioned in the above link,i had the system setup. I am able to connect to VPN using the default network manager that comes with Ubuntu.
But from command line, using pppd dialing,i am unable to connect to server.I get only the following messages in /var/log/messages always.
Log:
####
Oct 6 15:01:09 hari-desktop pppd[3660]: pppd 2.4.5 started by root, uid 0
Oct 6 15:01:09 hari-desktop pppd[3660]: Using interface ppp0
Oct 6 15:01:09 hari-desktop pppd[3660]: Connect: ppp0 <--> /dev/pts/5
Oct 6 15:01:10 hari-desktop pppd[3660]: Connection terminated.
[Code]....
Is there any specific VPN client using which i can establish a connection with the following information in hand ?
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Aug 3, 2009
I'm using fedora core-8. I need to setup dialup server to accept dial up connection.Dial up server shoudl also allocate ip address to client (trying to connect using modem)If some one knows how to do this, please let me know.I'm trying to achieve peer to peer communication between two computers connected using modem on both side over PSTN line.
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Oct 9, 2010
create a pppd server to allow other users to connect through my telephone line.Could you suggest a documentation to get started?
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Apr 13, 2010
I delete the file and within about a week i am back to a "out of space error" I have tried root owning the file with no permission to write, but it still gets written, just with a number on the end
the system appears to be working fine otherwise. I could set a cron remove but that seems a bit more hacky than telling it to shut up.
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Apr 12, 2010
I want to connect to a vpn server and I'm using debian 5.
I installed Kvpnc package but when I try to make a new profile I choose "Microsoft pptp" as vpn type and I receive the following message: the required daemons (pppd and pptpd) aren't availabale
Is there anyway to download required daemons in another computer and use them in my computer (I'm worried about dependencies)?
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Oct 12, 2010
Why does the loopback interface has such a high mtu? I get it that it needs to work out even large packets, which is logical but why this specific number? I can set the MTU even higher with the ip link command, so it's not a limitation of the variable used.
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Nov 22, 2010
The concepts of pseudodevice and loopback device ?
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Jan 13, 2010
I have two ethernet card on my computer, I want to make a TCP or UDP communication between these two cards, so I disable loopback: #ifconfig lo down. but with out loopback I can't even ping an eth from another one. how should I do? I want traffic to really pass eth cards.
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Feb 15, 2011
I have a server application that uses loopback addresses to open servers on linux machine.
For IPv4 with one line of configuration I can open many servers according to the mask I use for example with 10.10.10.0/24 I can open 254 servers.
How can I do the same for IPv6 ? I am able to add loopback interfaces but only for one host. Is it possible to add for a subnet ?
If not what is the max number of addresses that I can add ?
I also saw that it add the address only to loopback lo and I can add it to lo:3 for example.
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Apr 20, 2010
I own an Ubuntu Server 9.04 on a remote dedicated server. Since a few days (?) the loopback interface is not 'up' on reboot : I only have eth0 (which works fine).Here is my /etc/networking/interfaces (did not change since server initialization):
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
[code]....
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Aug 22, 2010
I run a webserver Apache2, php5, and MySQL. They are all set up correctly and I can access my website at [URL] I have, also installed, noip2 to update my IP address to no-ip.com for my domain name. Here's the problem: I can access my website through that domain name on other computers, both on internet and on the same network. But I cannot access it from my own computer (using the domain name instead of localhost). I need to be able to access the domain name on my computer because some pages on my website have been defined as the address to my domain name and not localhost. I cannot change this to localhost because if I do then people outside cannot work the webpages correctly. I had the same troubles on Windows before and I simply enabled loopback connections by typing in my private IP address along with the domain name into the Windows hosts file. I use version 10.04.
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Mar 24, 2010
I'm setting up a loopback server for work related testing. I have a small program that needs to be executed through telnet from about 200 IP's on the same network. On the server, I have to set a static ip, enable telnet login, and place my 2 program files in the appropriate folders so it will run. I have been on this for 2-3 days and haven't got far.
My /etc/Network/interfaces file is this...
Auto lo
iface lo inet loopback
The rest of terminal is filled up with these, and it states that the file only has 32 characters. I don't know if this is a privilege issue or not. I've read several threads on telnet, and lots of arguments about ssh, but I can't run ssh, so I need to enable telnet. There is not a security issue. I run a private network where the only valuable resource would probably be the text file with my IP address on it. Its also accessed by people that have very limited networking knowledge and no linux knowledge...
So,
Set static IP
Setup telnet server...
Any takers?
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May 6, 2010
I'm using Wordpress on Apache localy to keep a diary (it's convenient because of the tags).
When I'm connected to any network (be it wired or wireless) my Apache (and Wordpress, of course) works just fine. But as soon as I go offline, I can't access the web server neither through browser nor by telneting to the 80th port. Pinging localhost works just fine.Here is my ifconfig when offline and when online:Online:
Code:
eth0 Link encap:Ethernet HWaddr 00:24:54:6f:07:aa
UP BROADCAST MULTICAST MTU:1500 Metric:1
[code]...
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Sep 1, 2011
So I have an Ubuntu server setup but my modem from my ISP only has one ethernet port so I have to run my server behind a router. I have been able to get the sever viewable to everyone outside of my network but when someone is inside my network they have to view the server by the direct IP the web address doesnt work nor does the actual static IP. I believe this is something to do with my router not being able to loopback. It is a belkin N600 DB.
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Dec 14, 2010
I have a client's linux server where someone added a script which sends spam mails from the server's local loopback address (127.0.0.1) all my seniors worked on it and couldn't trace the script on the server this issue was going for a week, now I have an idea to bring down the loopback interface of that particular server(ya, that was not a permanent solution but just had an idea), but my support manager told that it will bring the whole server down(so far as i have learn't loopback address is used only for testing the NIC card's functionality), is that really bring the server down.?. How ever i tried this using a test machine all the connections works fine even after i bring down the loopback interface. As my client's server is a production server i can't test it there without clear knowledge, can any one help me out whether will it bring down the server or will it cause any side effects on it(i know that you guys are experts so i am asking it here)?
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Oct 22, 2009
I just updated to the new drivers. In my Xorg.0.log file, it doesn't show any errors. It just stop at a black screen. This might be a new bug with the binary drivers.
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Jun 22, 2010
I have a problem with my F13 and wired connections on my Acer TravelMate 2410. When I connect the inet cable it doesn't show it as connected. When I type ifconfig, it shows everything as it should. When I tried to bring up eth0 with ifup eth0, it said that the device is not managed by NetworkManager. I tried to restart nm with service network restart, but it gave this error:
Shutting down loopback interface: Error org.freedesktop.NetworkManagerSettings.InvalidConn ection: ifcfg file ;/etc/sysconfig/network-scripts/ifcfg-lo' unknown
The same error came up for eth0 and Wired_connection_1 (the connection I configured from NM )
When I typed nmcli dev list it gave me:
GENERAL.DEVICE: wlan0
GENERAL.TYPE: 802-11-wireless
GENERAL.DRIVER: ath5k
GENERAL.HWADDR: 00:14:A4:4D:B8:FC
GENERAL.STATE: disconnected
CAPABILITIES.CARRIER-DETECT: no
CAPABILITIES.SPEED: unknown
WIFI-PROPERTIES.WEP: yes
WIFI-PROPERTIES.WPA: yes
WIFI-PROPERTIES.WPA2: yes
WIFI-PROPERTIES.TKIP: yes
WIFI-PROPERTIES.CCMP: yes
GENERAL.DEVICE: eth0
GENERAL.TYPE: 802-3-ethernet
GENERAL.DRIVER: 8139too
GENERAL.HWADDR: 00:0a:E4:EB:32:E2
GENERAL.STATE: unavailable
CAPABILITIES.CARRIER-DETECT: yes
CAPABILITIES.SPEED: 10 Mb/s
WIRED-PROPERTIES.CARRIER: off
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Feb 7, 2010
I added the following lines to my /etc/rc.local file:
Code:
ifconfig lo:0 10.10.10.1 netmask 255.255.255.0
ifconfig lo:1 10.10.10.2 netmask 255.255.255.0
[code]....
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Jul 22, 2011
I'm running Ubuntu 11.04 and I've been unable to access any type of Internet service besides web browsing. When I check on Network Tools, it's always set on Loopback Interface, regardless of whether I've just switched it to Ethernet Interface. I haven't been able to download system updates through Update Manager. I'm not very experienced with Ubuntu.
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Jan 12, 2010
New CentOS 5.4 system working fine. Sys admins came in and copied the hosts file from one of the servers down to my desktop and ever sincethen machine has been slow (progs take 10-20seconds to load). RunningGnome. Luckily I saved the old hosts file and copied it back and all is now well. But I'd like to understand why, particularly as I will need to change myhostname in the future.
As configured:
/etc/hosts (yes my hostname is "dummyName" that I will need to change later)
127.0.0.1 dummyName localhost.localdomain localhost
[code]....
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Jun 8, 2010
I'm running a Source Dedicated Server on my Ubuntu laptop, and to connect to it via external IP from other computers in the network I need to enable loopback in my router.This was working fine, but then I disconnected my laptop for a few days, and when I came back the wireless stopped working on my Xbox. I reset the router to factory defaults, and then setup everything again. It was all working fine until I enabled loopback again and power cycled my router. Now every time I do that, the internet on Ubuntu stops working and the wireless on the Xbox stops working.
Edit: You can ignore this I guess. It seems I was actually DISABLING loopback by enabling that router option, which I guess caused this. Strange, because the first time enabling this option was the only way to get my external ip to work. Oh well, everything is fine now.
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Mar 26, 2009
I have been searching the forums for quite a while, to add extra Loopback adapter in Centos 5.1, but no success! Could you please suggest me the steps? in Windows, it is quite easy to add as many adapters as you want. wondering, if this is even possible in Linux? I have to run GNS3/Dynamips for router emulation and bind those Loopback adapters to virtual routers!
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Jul 6, 2011
I use the direct ip instead of the hostname and have recreated the printer several times and the issue doesn't go away. Test prints go through fine to the printer but when I actually try to print something this error comes up from CUPS.
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Feb 12, 2011
i need it to use sakis3g script for usb 3g modems.Are those programs listed anywhere, idk if i have to search for any other dependencies.Like cd 2 contains the following programs..cd 3 contains the following programs...cd 4 contains the following programs.
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Dec 23, 2010
I recently encountered an error with pppd on both openSUSE 11.2 and 11.3. I use umtsmon (which uses pppd) to connect to the internet with my 3G device. Yesterday for some reason it just plainly refused to connect to the internet. I have been using the same configuration for almost a year now without any issues. I tried it on 4 different computers running 11.2 and 11.3 and all of them failed. Thinking that it is the hardware I borrowed a windows laptop and tested it on that, only to find that it works flawlessly. On my network server I sometimes use the device as a backup and activate it with "ifup modem0", for some reason this also now fails.
After doing some troubleshooting I managed to extract the following from pppd.
Running it with my user account:
pppd options in effect:
I have no idea why pppd would break all of a sudden but I expect it might have been an update that broke it since I have automated updates on all of my systems.
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