Networking :: Scp Sends Ok But Stalls On Receiving
Aug 17, 2010
I have set up a server using Suse, which I have done several times. This one is running 11.2 'Emerald'. It has 2 network cards. One is connected to a bt router with a static ip, and the other is for the internal network. The server is used as the gateway for the internet via masquerading. I have 2 issues, which I suspect are related. I can ssh to and from the server fine, but if I try to scp a file, it is fine sending to a remote machine, but stalls if I try the other way.
It also stalls if I try and send from the remote machine to this one. I have tried debug mode, but no 'error's occur, it just stalls.The internet connection is also very slow and sometimes stalls, so there may be a link.I am not new to linux, but this has me baffled. This server replaced a Suse 10.2 server with similar config, and that worked fine.The firewall allows ssh, so I don't think its that.
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May 5, 2010
I was previously running Ubuntu 9.04, with no problems, however since installing 10.04 this past weekend, I noticed a problem today.We have a NetApp FAS250 at work, formatted as CIFS filesystem so our windows users can access it. With 9.04 I had no problem ready and writing to the shares.Today, I tried to copy some files from one folder to another and the "File Operation" dialog came up with 0 bytes of 2.8MB -- 0 seconds left (0 bytes/sec). However, no files are being copied.
I closed the dialog and tried again, same thing.After a reboot I tried to copy files off the share to my hard, same thing, the dialog would just sit there.After another reboot, I tried to copy files from my hard drive to my hard drive (different folder), that works fine, and copying from my hard drive to the network works fine. Just not from the network.
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Jun 25, 2010
I've got a fresh install from the alternate CD. The thin client gets to the point where the screen fills with dots .........done, then it just sits there and does nothing else. No error messages or anything. I have a two nic setup that worked great on karmic and haven't changed any of the hardware around or anything. I'm at a loss as to what to do, I've reinstalled several different times fiddled with every setting I could think of and searched and read till my eyeballs are ready to fall out. It has become a matter of principle to me now and I refuse to go back to an earlier version.
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Feb 1, 2011
I have been receiving 4.5 KiB/s to 7.0 KiB/s on average. This is with nothing connected actively using Wi-Fi (browser, download, etc.) Why is this? It is happening on Lucid x86. I have a 64bit machine, but unfortunately neither the 32bit or 64bit wireless works "out of the box" for me. My wireless card is Ralink RT3090PCIe. I have not found a package to support my card in Ubuntu 64bit (I prefer 64bit over 32bit.). For now there is this as a package for Ubuntu 32bit https://launchpad.net/~markus-tisoft/+archive/rt3090
Another thing, as of late (about a week) my wireless connection strength has diminished substantially was 95-97% now 73-85% This is unusual. Hopefully not any shady neighbors.
I am strongly considering deleting the Ubuntu partition, until a 64bit works "out of the box" for the wireless or at the very least only use this Ubuntu 32bit Lucid version with all network permantly disconnected. To be fair, I have tried quite a few other 64bit Linux distributions (Live CDs) and these others did not work wirelessly "out of the box" either.
I am by no means a Windows "fanboi".....but Windows 64bit does work for me "out of the box", as it should. So, I may have to go there (back to Win7), until I find a release of Ubuntu 64bit that has a wireless that works for me, without any errors/problems.
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May 14, 2009
I have to implement a client/server solution that pretty much does this:
1) Client broadcasts UDP packet;
2) client receives answer packet from multiple servers - it includes the TCP port to use next and a list of files;
3) user picks file from list;
4) client downloads from server via TCP.
I got the client to broadcast and the servers reply. However, i'm not yet getting the client to be able to receive multiple packets.
I'm very inclined and have tried to implement select, but most examples i find are for stream sockets. Once the fsSet shows a read event would i create a new socket or just use the main socket for recvfrom()ing? I assume i need at least two sockets. However i'm not sure if this will allow the client to actually receive simultaneously... so i'm kinda not wanting to guess that this implies fork and threads... Also, i assume the socket must be nonblocking (done), although i've read somewhere select would take care of this?
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May 18, 2010
I have recently set up nagios on a ubuntu server (9.10), and set it up to monitor all the servers, switches etc, following the quickstart guide provided on the nagios website.My problem is this:I have setup the nagios-plugins, and tried to set it up to monitor the network switches via SNMP but receive the following within the nagios web interface:SNMP problem - No data received from host I tried it from the command line, and got the exact same error.Is there some further configuration I need to do to be able to get this data?I've used up all my google-fu, and read over everyone else's problems on every forum I could find, but to no avail.
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Jul 9, 2010
I am trying to run some benchmark tests for multicast. What I want to do is have one system send multicast packets and another receive it on all it's interfaces (eth0-eth3). Whenever I run receiver on more than one interface I get echo effect (if I receive on x interfaces then I get same packet x number of times). Is this how it is supposed to behave? It does not make any difference whether I use loop-back or not. I have set SO_REUSEADDR to yes. I run separate instance of receiver on each interface. I am doing this on RHEL5 systems.
# uname -r
2.6.18-164.20.1.el5
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Apr 11, 2010
I have a computer with two interfaces: a fixed connection (eth1) and a modem (ppp0). My goal is to receive UDP packets from both connections concurrently (using the recv() function). The problem is, that the received packets reach the application only when the default gateway is set to that interface's address. For example, if I set the default gw to be in the eth1 subnet, only packets from eth1 reach the application. Other packets are received in the interface (checked using tcpdump), but they seem to be blocked somewhere. The policy defined in iptables is "ACCEPT" for all incoming packets, with no rules at all. I would like to know how to overcome this problem, and anyway how is the default gateway related to incoming UDP?
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Apr 8, 2010
If I type
Code:
$ ping [URL]
or even
Code:
$ ping google.com
should I receive a reply?
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Mar 8, 2010
We have connected two systems with ethernet cables and have configured the two systems with ipv6 addresses. The IP of one system is 2001:0db8:0:f101::1 (let's say X::1) (This system runs OS Fedora 10) and the other is 2001:0db8:0:f101::2. (Let's say X::2) (This system runs OpenSuSE 10.3) We are able to ping from both systems to the other. We are able to ssh into the one with IP X::2 from the one with IP X::1, but not vice versa.
We have disabled iptables on both systems by using the following commands:
/etc/init.d/iptables save
/etc/init.d/iptables stop
on the fedora 10 system and
# iptables -X
# iptables -t nat -F
# iptables -t nat -X
# iptables -t mangle -F
# iptables -t mangle -X
# iptables -P INPUT ACCEPT
# iptables -P FORWARD ACCEPT
# iptables -P OUTPUT ACCEPT
on the openSuse system.
The error we get in trying to ssh from the openSuse system to the fedora system is:
ssh: connect to host 2001:0db8:0:f101::1 port 22: Connection refused
We're trying to write server and client code to send data from one system to the other using SOCK_DGRAM. The code works fine when we run both the client and server on the same system. However, we are not able to send data from one system to another when we use the IPv6 addresses to run the client and server programs.
The error we get is:
sendto(): Operation not permitted
The codes we are using for the server and client programs can be found here in beej's guide here : [URL]. We've only substituted the appropriate addresses in the right places... We've disabled the iptables...
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Jun 25, 2010
I would like to send a data using one thread and receive a data using other thread by using a same socket connection using USD sockets. The calls i am using for sending and receiving are send(), recv(). let me know is it possible to send and receive the data parallel (Full duplex communication)?
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Mar 30, 2011
I have a linux box with two interfaces: eth0 is a builtin and eth1 is a USB-LAN.
There is an IP configured on eth1.
eth0 is up but no IP is configured. This interface is used for sniffing with tcpdump.
The problem is that eth0 frequently stops receiving packets -- my tcpdump captures are empty, and if I look at the interface stats with ifconfig, I can see that no packets are received.
If I bounce the interface (ifconfig eth0 down; ifconfig eth0 up), it starts receiving packets again.
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May 19, 2010
I have a server which is used by number of client Apps. Now when a client initiates a sendto request to a server it has to respond(after recvfrom) by sending a message using sendto back to client and this should be done back and forth.
What I dont understand is, does the client have to open a new port to receive packets from client? If yes, then how will server know to what port of the client(assuming server ports are well-known to clients)?
I had given up on sending messages back and forth using UDP and switched to TCP. I could send a read and write message back and forth. But the trouble comes when I have more than one client wanting to talk to server using SOCK_STREAM. The first one gets through but the second client seems to get blocked forever(but I got no error upon socket creation or upon connect with the server on the same port as the previous client)..
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Feb 17, 2011
There is a segmentation fault error while receiving http request side program. Following is the code:
Code:
#include<iostream>
#include <sys/types.h>
[code]...
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Nov 7, 2010
I still try update my broadcom drivers, because when I try use airodump-ng i receive error.
This error:
Interface Chipset Driver
eth1 Unknown wl (monitor mode enabled)[code]....
I dont know why receive this error WARNING: modpost: missing MODULE_LICENSE() in /home/mobile/Desktop/wdriver/wl.o
see include/linux/module.h for more information
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Oct 12, 2009
I am losing network bandwidth and I am quite frankly I am not sure why, I don't have allot memory 495.6Mib
But I clean my PC every few days "BleachBit"
I have read some where on the magazine Network receiving suppose to be higher. so how can I fix this issue please i am having allot problems, u use cable from Comcast
I am not quite sure what Information you might need from me to give.
I use Ubuntu 8.04 LTS
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Jul 9, 2010
I cannot remember the name of an app I once found that sends keystrokes from terminal. I believe it started with the letter t and was only a few letters long...
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Jul 21, 2010
It seems there is a bug with F13Files send over Bluetooth to my WM phone are corrupted.When I send files, the Bluetooth transfer starts normal, then when the transfer finishes the window stays open (like it does not complete the transfer).I am unable to run or use that files on the WM (they are binary or data) so I assume they are corrupted. I have no problem with Ubuntu/Opensuse (I have a test disk with Ubuntu and OpenSuse) only with F13.
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Feb 23, 2010
I just installed my version of 11.2 and am slowly setting up the software I need to make my Windows box an expensive paperweight. I recently set up my KMail to receive mail on my POP3 acct. I only recently had reason to send an email to myself at work to remind me to do something. When I hit send this is what I got:
[code]...
And it was in the clear. hmmmm. Is this how KMail sends it's authentication string? I have never really looked at SMTP or POP packets so maybe they all send them like this but I was a bit shocked when it came up like that. What if someone had been looking over my shoulder?
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Aug 2, 2011
I'm looking for a live Linux distro that is secure and preserves my anonymity online. For what I need, Tor seems to do the job - but such software requires configuration that someone who is not knowledgeable in how it works might find difficult. I was looking at 'Lightweight portable security' but it does not specify whether it sends all traffic through Tor. Does anyone know more information about it and/or any other such live Linux distro?
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Nov 3, 2010
how can attachment sends through mail command in linux with mail command either with mail -s or -v option also please confirm how to download the attachments from it . and how one should knows with mail command that attachment is present with the particular mail
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Oct 13, 2015
It's hard to understand the whole systemd stuff. Specially in combination with mdadm and sendmail. My goal is to get a mail every boot about the state of the RAID. Also get a mail when someone is wrong with the RAID while my computer is running. How I can reach this target I don't care especially. It just has to be a Debian package and stable
OK, to the story: I made a while ago an dist-upgrade from wheezy to jessie. Before, everything works fine. I boot my computer, the RAID gets checked and a mail was sent to my email-address with the state of my RAID and the disks of it. For this I followed a HowTo from [URL] .... After the upgrade, I dont get a mail anymore.
Here some details.
Actually installed: Debian 8.2 Jessie
Code: Select allsystemctl status mdadm-raid -l
● mdadm-raid.service - LSB: MD array assembly
Loaded: loaded (/etc/init.d/mdadm-raid)
Active: active (exited) since Son 2015-10-11 16:11:34 CEST; 21min ago
Process: 281 ExecStart=/etc/init.d/mdadm-raid start (code=exited, status=0/SUCCESS)
Okt 11 16:11:34 xy-server mdadm-raid[281]: Generating udev events for MD arrays...done.
[Code] ....
When I execute
Code: Select allecho "This is a test e-mail from my server using msmtp" | msmtp -d xyz@gmx.net
or
Code: Select allmdadm --monitor --scan --test --oneshot
Everything works. I get the mails like I need it. In my opinion it's not a problem of the mail configuration. It seems, there is no network when the RAID get's started and the mails want to be send.
What I'm wondering is also, that obviously the
/etc/default/mdadm
is ignored by systemd and only the
/lib/systemd/system/mdmonitor.service is executed. But while booting the RAID get's startet with /etc/init.d/mdadm-raid and this should read the /etc/default/mdadm. Right? Confusing!
Anyway, is there a way, how I can easy change the order (without any side-effects) of the startup for the network and the RAID. I can't figure out, which unit I have to change, that it will work. Or maybe is there another solution? Like I mentioned, it's just have to work with Debian stable packages
There are various units who sounds nice, but wich one is the correct one?
Network:
- network-online.target
- network.target
- system-ifup.slice
- ifup@eth0.service
Disks:
- local-fs.target
- mdadm-raid.service
- mdmonitor.service
- -.mount
And how can I be sure, that every dependency of the network units doesn't depend on a filesystem unit?
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May 26, 2010
My server is opensuse 11.1 I recently wrote a small script to quickly shut down or reboot my server (I needed this because I need to close an application manually before shutting down. The shutdown line in the script was: /sbin/shutdown -r now When I tested the script (as root) from the console terminal, It worked just fine but after reboot strange things started to happen if I logged in as root - while the mouse works, the keyboard freezes (rebooting the server does not help). While I can still use console terminal, if I try to start any application that requires root permission or log in as root from my sftp client then I will get an error on the server that says; broadcast message from root (time & date), the system is going down for reboot now! I have since commented out level 6 in my inittab, so that now when root sends a reboot signal and It shows the message about going to reboot, it does not actually go into reboot anymore because of the commented out line but that is ofcourse not an healthy way to go about it.
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Jan 24, 2010
The only problem is I'm having trouble with Bindwood, the bookmark synchronising program. I'm on 9.10 and using firefox and whenever I try and delete a bookmark it just appears in my bookmarks next time I restart firefox.
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Dec 23, 2010
I have 2 email accounts set up in Thunderbird - one is gmail and the other was given me by our server admins few years ago. Everything works fine on windows but when I try to send something from the second account (not gmail) in ubuntu it says that password is incorrect. Ive double checked all settings and seems like everything set correct. Now the most interesting part: when I set up this account as root (gksu thunderbird and then do same as I did under my account) everything works perfect.
I found only one thread at this forum with same issue and sure it's not solved [URL]..
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Jul 20, 2010
a file or a process that is always running and pinging for example [URL]. returning 1 or 0, when returns 0 (that means have no response) do something else. i already made the something else, basicly sends an email etc.
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Jan 12, 2010
I think I put my question on a wrong sub-forum. My problem is I can't get apache to produce right output to XMLHttpRequest responseText but instead it displays php source code. On another server the same code works as it should.
When I open the php script on a browser window it works as it should.
this is the thread in programming sub-forum Apache sends php source code to Ajax - openSUSE Forums
I'm using Firefox 3.04 and SuSE 11.1
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Jun 15, 2010
I'm trying to sign up to office-live but I'm getting this error. Is it possible to report to office-live that I'm using windows so I should be able to use the service.
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Feb 7, 2010
I bought an imac G3 yesterday and it has xubuntu 6.06 Dapper Drake installed on it. When i turn it on, after it POSTs, a little xubuntu logo appears it it begins to load 'essential drivers' and mount the file system, etc. After it is done doing that, it simply prompts me into a CLI that on the top says "Ubuntu 6.06.1 LTS ubuntu tty1". It asks for my username and password, and then it just keeps me in this tty1 terminal. I did some research online and supposedly by pressing alt+F7 you can exit the tty terminals and go back into GUI mode. Well pressing alt+F7 does nothing, and pressing alt+F1 through 6 just sends me into the different tty terminals.
I am very new to Linux so if someone could give me an idiot proof explanation on either how to fix it or whether im screwed and just need to reinstall xubuntu on here.
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Feb 17, 2010
When I start up my computer Xubuntu is asking me to login (which is strange as I have login disabled). Then, when I do enter my password, it is accepted and after a few screen changes I am returned to the login screen. (I know the password is correct as the login screen informs you immediately if you enter it incorrectly.) Also, I can see that my display settings have been changed--the monitor resolution is wrong--my cursor is way big as are buttons, text etc..
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