We have a problem with tcp link.
Os version: linux 2.6.9
Client will connect 2 tcp links to server.
One link is ok but another can't.
From tcpdump, we see:
1. client SYN-----> server
2. server SYN/ACK---> client
3. client ACK ----> server
4. client data ----> server
5. client retransmit data some times ----> server
6. server SYN/ACK ----> client (weird, it look like server miss the step 3)
I tried to install gcc on my box, but I got "Missing Dependency" in the end.
# yum install gcc
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
dcsrd
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I configured openLdap in RHEL5 on virtual achines,everything is working fine, I created a user called ldapuser,in LDAP server and i created a home directory for ldapuser in my LDAP client, now i can able to login to the both Server and client with ldapuser account....
Now here what am expecting is i want to export my server's home directory to the client, i dont want to create home directories manually in the client machine, i googled about that, and it can be done through autofs.....
what need to be done on the client and server side.
I have 2 ethernet cards but when I look at the Network configuration in "Hardware Tab" I have another acx wireless network. How to delete that because In my system Idon't have wireless card..probably installed before but want delete it now.
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then windows can ping server and resolve ip address and browsing Internet but can't ping [URL]... result is Request time out. ICMP already enabled in iptables.
I have a wireless router situated in another room. I am able to access this router (and consequently the internet) through a Windows laptop that has a wireless card in it. However, my other laptop that has Ubuntu 10.10 installed on it, doesn't seem to have a wireless card in it, and I have confirmed this by running the commands
Code:
lspci
and
Code:
iwlist scan
I briefly was able to share a folder in my Windows machine, and access it through my Ubuntu machine, after connecting both laptops with a cross-over cable. However, I can't even ping the Windows machine from my Ubuntu machine anymore, after trying to configure the IP addresses. I think I screwed it up.
Also, although this is not an Ubuntu issue, I have a weird Windows problem, where I can't access the Internet when both wireless and wired ethernet controllers are active at the same time. It would be a bonus if you could solve this problem too for me. I was surfing online for a solution to this problem for quite some time, but I was unable to comprehensively understand and implement what I browsed through. Also, some of the guides, like for example, that on configuring Samba, seem to be outdated, as the terminal tells me something like the package (that was required to be installed by the guides through sudo apt-get install) has been superceded. Hence I post here for clear, concise and easy-to-understand help from you gurus. It would be great if I could achieve the end result of being able to access the internet on my Ubuntu machine (through the Windows one).
I'm trying to synchronize a client with an ntpdate server. The ntp.conf file from the server has the following lines: # /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for
driftfile /var/lib/ntp/ntp.drift
# Enable this if you want statistics to be logged.
#statsdir /var/log/ntpstats/
statistics loopstats peerstats clockstats
filegen loopstats file loopstats type day enable
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How I am configure DNS Client and server in Redhat Linux 4 in my lab.I have total 5 computers and they are Lan connected.I want to make one of them server and the others are client.
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I am facing connection refused error 111 in TCP client server program, in android native code which in C , but if code is in JAVA it works fine, but i want to continue in C only, in manifest file i have given permission and ip, port is correct .What am doing wrong?? or is their any network setting?? am using UBUNTU 10.04and If both client server Linux pc it works fine. only if android emulator becomes client then am getting connection refused
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192.168.12.02 is a Linux server that has a NAT set up to share the internet connection.
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I want to make it so that the download server runs at full speed but is throttled only when someone from the user IP addresses range tries to use the NAT server.I think I'm looking for some way to set the download server's packets to have a lower priority than the client's packets. Is there a way to set this in the Linux server?
Was trying to understand the behavior of TCP when the server becomes unreachable . For this I am using vsftpd and the default linux ftp client to check the behavior.I was trying the following things. Was Trying to download a file from an FTP server using the FTP client as anonymous user. While the file is getting downloaded, I removed the network cable from the FTP server to understand the behavior of TCP when the server becomes unreachable.
As per the functionality of TCP/IP , when the server becomes unreachable for whatever reason , the client tries retransmitting the data till it can send the data or it timeouts. But in my above experiment using FTP , I can see that the FTP client is not trying to retransmit data at all . This I came to know using by sniffing FTP traffic at the client side. Is this expected or default FTP client available in Linux does not obey TCP/IP functionality properly ?
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I might add that I have set up user id's and group id's the same. My user is 1003 on all systems, and the users group is 100 on all systems. When I am on alpha (via ssh), here is a partial file listing.
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[dick@alpha dick]$ ls -l
total 9740
drwxr-xr-x 3 dick users 4096 May 16 2009 airplane
-rw-rw-r-- 1 dick users 240978 Jun 27 2009 Alice Grad 1934.pdf
-rwxr-xr-x 1 dick users 444 Jul 8 2007 alpha2ast
-rw-r--r-- 1 dick users 444 Sep 2 2009 alpha2charlie
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If have searched the Mint forums, LQ forums, and google in general. I must be missing something in my search because I can't believe that no one else has this same problem and I am having it on 3 different boxes.
shed some light on what I am doing. I am wondering if I just havehings back to front.Server (MESH):Fedora 13Firewall ports open tcp 22(ssh), tcp 873(rsync)sshd service started
View 5 Replies View RelatedI am capturing the same traffic both on client and server. Using Microsoft Network Monitor on client and tcpdump on Linux server.
And when comparing the content of one specific frame captured on two machines, I see it different!
Precisely:
I have SIP communicator on client and opensips on server. Client is doing a REGISTER request to the server. This request contains "Contact:" header, which should contain an IP address of the machine.
When capturend on client, this header contains local private IP address of a machine with SIP communicator (which is 192.168.***). But when captured on server, this header contains the outer address of my provider's router.
I have 2 possible explanations:
1) Some unknown agent acting between my client and server
2) opensips itself is acting at a so low level, that the result of it's frame manipulation is visible by tcpdump.
I am interested if the second option is possible? opensips is a proxy, so does proxy able to manipulate frames directly in the medium?
If so, the is it possible to run tcpdump at a lower level, so that it see packets before opensips processing?
I'm carrying out a project for my university (CIT in Cork, Ireland) and I'm using CentOS running over WMware. I have a server and a client. The server has no GUI (command line UI) while the client has a UI. I need to install a Simple Forum Machine application and I'm told to FTP the files into the server. I figured out that the best option is to load the files in the client via the GUI and then ftp them in the server. How do I transfer the files from a the client t o the server using FTP? I'm totally new to Linux so the more details the better. Also I'm trying to mount a USB key on the server but have had no luck.
View 2 Replies View Relatedhow to setup a home network for learning purpose. i have two laptops and a desktop connected to a modem-router for broadband (wired connection), i want to setup one as server and the others as client.
View 2 Replies View RelatedMore for my own posterity than anything else, I thought I'd document here the way to get to eDesktop through linux (debian, ubuntu) at the University of West Florida (UWF), since they appear to only support Windows through their documentation on the University web site, and the link through Argus (the secure web site) doesn't work in Linux. This is sometimes needed to use the University resources (libraries and computer programs) from remote locations, and otherwise a google search is fruitless. I had to have a guy in the computer science department show me how to do it.This may apply for other Universities with similar setups.
View 1 Replies View RelatedI'd like to access a samba/SSH server which itself is connected to a VPN Server, therefore acting as a VPN Client. As soon as the VPN Connection is established, samba and ssh connections to this VPN Client get a timeout. But not all of them.
To get a better understanding I made an overview. The first one is a general network overview, without any VPN Connection, the second one with the VPN Connection established.
Network Overview without VPN
I can access the server in several ways:
*From the router via ssh (router runs ipcop with busybox)
*From the laptop via ssh (putty via Windows 7)
*From the laptop via samba
*From the internet via ssh (port forwarding to the ssh server)
Everything is working as it should.
Now the server that runs ssh and samba service connects to a VPN Server on the Internet, this is also working fine. Now it gets weird. The only samba/SSH connection that is still working is ssh directly from the router to the server. Everything else gets a timeout:
*From the laptop via ssh (putty via Windows 7)
*From the laptop via samba
*From the internet via ssh (port forwarding to the ssh server)
Network Overview with VPN active
Why is that? It seems from the little understanding I have of vpn and networking, that incoming packages (like samba request from the laptop) don't get send directly back over eth0 but over the vpn connection. This seems somewhat logic, BUT ssh from the router is still working. Why from the router and not from the laptop? I really can't get my head around it.
Configuration Overview
tldr; One Client acts as VPN Client and samba/SSH Server. As soon as the VPN Connection is established samba/SSH stop working, but only partially.
So I setup VNC on my Mac (that runs Snow Leopard) and my PC (that runs Ubuntu) and I gave the IP address to Ubuntu, entered the password and it worked fine. The problem is that it still works fine... I only made this connection to test it because I thought it'd be cool, which it was (for a while). Now I cannot delete this connection whatsoever!
I have tried changing the password on the Mac, limiting the users, and even switching it off completely by unchecking its checkbox. I have also tried limiting the users... BUT UBUNTU STILL MANAGES TO GET INTO MY COMPUTER! This is really annoying because anyone using the PC downstairs can now go into my Mac and mess about with things - I hate this. Somehow, Ubuntu has locked in on my Mac and, despite the changes, can earn access no matter what!
i want to share the Internet connection to thin client from my Ubuntu server,Internet is accessible to my Ubuntu server but i am unable to boot from thin client to server,i configured DHCP but of no use.can any plz send me the detailed steps to configure thin clients in my network
View 1 Replies View RelatedI'd document here the way to get to eDesktop through linux (debian, ubuntu) at the University of West Florida (UWF), since they appear to only support Windows through their documentation on the University web site, and the link through Argus (the secure web site) doesn't work in Linux. This is sometimes needed to use the University resources (libraries and computer programs) from remote locations, and otherwise a google search is fruitless. I had to have a guy in the computer science department show me how to do it. This may apply for other Universities with similar setups. It was impossible for me to figure it out on my own, I had to go back to my old 9.04 partition to get the info...
1) Open Terminal Server Client (Applications>Internet>...)
2) Insert as follows:
Code:
Computer: eDesktop.uwf.edu
Protocol: RDP
User Name: YOUR USERNAME
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3) OPTIONAL BUT RECOMMENDED click Save As and save it as a quick connect so you don't have to refer to this again.
4) Flip through the other tabs and configure as desired, and click Connect!
I have a problem with a simple client/server socket program. the connection is done through 2 connections a udp connection and a tcp connection. the flow is that the client sends a udp packet to the server and the server returns it through a tcp connection. this is done in a loop. my code works fine on an ubuntu server, when I try to use it on redhat it sometimes get stuck. the server is stuck on recvfrom and the client waits on the recv. if i add a delay in the server or run the client through strace everything works fine.
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