Networking :: See The Server Is Sending Tcp Packet With Date&time, But The Client Ignores It?
Jun 28, 2011
we have a minor issue with time synchronization in proprietary equipment.the client needs to synchronize time with server, but not using NTP.it is not very important so doesn't need to be done often.the problem is that it won't synchronize. I can see the server is sending tcp packet with date&time, but the client ignores it.I suspect the problem is in format (manual specifies there are two possible options like MM: DD: YYYY and so on, but server seems to use some other)Is there an easy way to run some program in Linux Debian, to send that simple packet with correct date?
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Oct 13, 2010
In order to debug a problem, I want to list down as many as possible reasons of a server (SOAP server running on Fedora 10) sneding RST in middle of packet transfer. Please note that in my case, SYN and ACK of initial handshake went through. Server received request from client and started data transfer but then suddenly, server sent RST in between data transfer.
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Mar 7, 2011
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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Jun 29, 2010
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
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Apr 15, 2010
I am trying to redirect connection to port 8980 to execute a telnet command to a local machine
by issuing the following command :
In Server 1 :
socat TCP-LISTEN:8980,fork EXEC:/myscript,reuseaddr
My script contains
#!/bin/bash
telnet 192.168.20.12 //local Server 2
I am sending Binary data from the client to Server 2 via Server 1. So it happens that I have some characters in Hex translated to special characters in ASCII like open brackets or Commas etc.. and that closed the socket between the two machines.
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May 25, 2011
Mu understanding of RFC 1122 (Fast Retransmit) is that upon receipt of the 3rd duplicate ACK, the sender should react by starting to retransmit the lost packets.
In my case, looking at the Wireshark trace, I see the sender receiving hundreds of DUP ACKS from the receiver and doing nothing about it until 200 ms pass by. Only then does the sender finally starts to retransmit. That's killing performance.
The sender is running Red Hat 5.3 (which is Linux 2.6.18). Is this an indication that the sender does not support Fast Retransmit? Is there a config param that I need to turn on?
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Mar 14, 2011
I'm implementing static IPv6 address on two Fedora 13 installed hosts. These two computers are connected using a switch between them and I use D-ITG to generate traffic in the network.I need to send packet from host1 to host2 using this command and I got permission denied
Code:
#./ITGSend -a 2001:db8:c003:111e::3 -T UDP -x recv_log_file -t 30000 -c 32
Connect error in createTransportChan(): Permission denied
[code]....
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Jan 25, 2011
I am trying to design an application which violates the DHCP. Specifically the difficulty in writing this application is physically sending the raw packet. I need some documentation on either a library that supports this or where to look for support for raw packet creation. I am not trying to create a raw datagram, that doesn't meet my needs because a raw datagram is still at layer 3 I need to craft a raw layer 2 PDU.
Specifically I want to
Send a very specific DHCPDISCOVER
Receive a DHCPOFFER
and pull apart the offer while never sending a DHCPREQUEST.
Specifically I am pulling apart various options that are sent in the DHCPOFFER. I have a raw DHCPDISCOVER already crafted and the formatted struct sockaddr_ll where I fault is I can't send the damn thing. Getting the file descriptor after calling socket is okay but what now? How would I write to that file descriptor and have it transmit?
Code:
int connfd;
struct sockaddr_ll bcast;
bcast.sll_family = PF_PACKET;
...
connfd = socket(PF_PACKET,SOCK_RAW,0);
//now what
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Jun 20, 2009
i have problem in sending emails using outlook on my client machines i.e XP i am getting the error Relay access denied. i am using fedora 9 as our server. with dovecot and postfix and fetchmail.it was working fine previously .
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Sep 17, 2009
I got a problem with my CentOS server. Somebody told me OpenVPN Requires different changes inside my firewall settings. That could be the problem why openvpn wont load..I receive this error on my CentOS panel when im trying to connect into the centos openvpn (with my winxp pc):
Thu Sep 17 20:31:36 2009 TLS Error: incoming packet authentication failed from 84.xx.62.122:2622
Thu Sep 17 20:31:38 2009 Authenticate/Decrypt packet error: packet HMAC authentication failed
Thu Sep 17 20:31:38 2009 TLS Error: incoming packet authentication failed from 84.xx.62.122:2622
[code]....
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Aug 17, 2011
However - is there such a thing as a decent HTML editor like dreamweaver? Komposer is buggy as hell - useless! Bluegriffon, well umm - screen fonts are bizarre, especially in viewing source code - brake down, multicoloured obviously a bug - no deb either, looks like a windows program install (?). This does look really good, but is unusable as I cant see in souce code view without getting a headache! Also, ignores css on links.
Seamonkey - you have to open browser then editor, then open your file. Ignores css totally. Amaya - ignores used fonts unless you re-edit - and ignores css on links. Weird way to select things as well, such as images. There must be at least one decent editor?
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Jul 12, 2010
I am the new user to ns-2. I would like to know is it possible to send the keys or some value as the packet data (content of the packet) in ns-2 (for wireless environment).
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Jun 11, 2010
Can I make my messages directly appear at client from server? Normally we type
tailf /var/log/messages
to see messages sent by other machine. So can I send my messages directly at command prompt?
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Jan 6, 2010
I am seeing log messages that I don't understand. If I run tail -f /var/log/messages, some times I will see this this sort of repeating pattern. I don't know if I have cut at the start of the sequence or not. Incidentally, this is a normaly well-behaved client/host.
[Code].....
Why is the client repeatedly sending the (1/4) message and then timing out?
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Mar 8, 2009
I need to know how to configure automate sending sms if server reboot and shutdown? Now i just set sms notification once my server it's UP by create scripts in /etc/rc.d/rc.local while booting then from server sending sms notification. SMS - using gnokii attached mobibe phone. Server - Fedora 10
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Jan 29, 2011
I got Apache and php5. I was able to insert php scripts from tutorial and see the results in Mozilla browser. But now something happened and Apache seems to ignore php script. I don't remember what i had done to my system that might have caused this problem, but most likely it is moving partitions in partition aditor, as this was the most serious thing I had undertaken.
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Feb 23, 2010
I'm trying to figure out why Apache is ignoring SSL Cipher statements when placed inside a Virtual Host. Specifically I'm trying to disable SSLv2 and only allow SSLv3 or TLSv1
In httpd-ssl.conf I have the following
Code:
And when I try and connect, I get the expected results.
Quote:
In my virtual host statement I have
Code:
The only difference between the two is the httpd-ssl.conf has -ALL in the CIPHER, and the virtual host entry has ALL. However if I try and change the ALL statement in the virtual host entry to -ALL I get the following error in my logs & get no content.
Quote:
Why it's not working in the virtual host statement? Unfortunately as many of you are probably aware it's impossible to gain PCI certification with SSLv2 enabled.
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Jun 11, 2011
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.
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Jan 6, 2011
For some reason, Ubuntu keeps assigning my network interface wrong MAC address. This happens only after fresh boot (I have dual boot with WinXP, if I start Windows first and then restart to Ubuntu without switching computer off, the MAC is correct). Contents of /etc/udev/rules.d/70-persistent-net.rules:
Code:
# PCI device 0x10ec:0x8136 (r8169)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:22:19:ef:1c:3d", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
# PCI device 0x168c:0x001c (ath5k_pci)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:17:c4:78:f4:f8", ATTR{type}=="1", KERNEL=="wlan*", NAME="wlan0"
[code]....
EDIT: I made a workaround by adding
Code:
auto eth0
iface eth0 inet dhcp
hwaddress ether 00:f3:f5:ef:fe:56
to /etc/network/interfaces and it works. However, I'd still like to know why Ubuntu ignores my udev rules, regardless whether the workaround happens to work or not...
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Nov 27, 2010
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.
[code]...
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.
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Nov 14, 2010
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).
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Apr 19, 2010
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
[Code]...
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Jul 5, 2009
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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Jun 16, 2010
I'm trying to setup a linux box to act as just a DNS server. Its something I'd like to use just for WAN type requests and leave other domain related things to the Server running WIndows.At this point on my Linux box, I can run queries and nslookups from it. I can not however, from a Windows box, run a NSLOOKUP command from the Linux box which is telling me to check the permissions from Linux to enable that for the clients. It's enabled.From a C: I type in nslookup - *ip of Linux box* and it tells me -- Can't find server name for address.
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Feb 4, 2010
Running Linux Fedora 10 on an Intel Core 2 Duo PC. Runs great. We are trying establish VPN between a client and server on the same LAN. The network is a standard fast ethernet, run great. We are trying to install OpenVPN server, but having a little difficulty. Key and certificate builds seem to execute without a problem. But when we try to start the service we get [FAILED]. I've attached a copy of our procedure.
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May 7, 2010
Is it possible for a client to "export" or "send" it's /dev/cdrom0 to a server via SSH? I have managed to st up a connection with Xserver so I can see the servers gnome interface in my ubuntu client.
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Oct 20, 2010
Can we create both server and client on the same system. I want to know whether it can be used on the same system.
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Feb 16, 2009
in my office all users connect to internet via VPN.in our office there is one special server that we want when users connected via VPN,users can not connect to the special server and when users are not connect to via VPN can connect to that server.
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Apr 12, 2010
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)
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Oct 26, 2010
I have an Ubuntu server that is currently running Ubuntu 8.10. I was thinking of making it a VPN server for my iPhone and also for my laptop whenever I'm outside and need to access internet over insecure wireless networks. Now that part should be easy I found several guides on how to configure OpenVPN server, as well as enabling clients on iPhone, and OSX.
However, the things is that my server is currently a OpenVPN client also, I have a paid tunnel set up to bypass my ISP blocking incoming traffic on various ports. Is it possible to keep this setting but still enabling a VPN server? Essentially causing traffic from my external device to go in through my tunnel to the VPN server, and then out through the external VPN provider.
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