CentOS 5 Server :: Authenticate/Decrypt Packet Error: Packet HMAC Authentication Failed

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


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CentOS 5 Server :: Centos And Xen: Lan Error - Vif0.0: Received Packet With Own Address The Source Address

Jun 18, 2010

I installed the Centos 5.5 and after the Xen. After I put a virtual machine named VM01.Initially it worked properly, I tried everything and it worked.When rebooted, I had problems with the network.I have two network cards eth0 and eth1, but eth1 does not have any ip and I use only eth0.The error that appears is:

vif0.0: received packet with own address the source address

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Ubuntu Networking :: Send The Keys Or Value As The Packet Data (content Of The Packet) In Ns-2 (for Wireless Environment)

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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Networking :: Wlan0: Option 43 Has Zero Length, Failed To Parse Packet?

Apr 14, 2010

I have a thread started on the Slackware forum about the possibility of installing Slackware on an older P4 laptop. Well, it installed fine and most things are working, but I am experiencing one problem that I need to solve before I progress to working on other things.

I hope the mods will not consider this a double thread because it is a networking issue and the other thread was started about a different subject, and I thought there might be more networking specialists there (though everyone I meet on the Slack forum is very knowledgeable, this one has not been solved.)

I am trying to connect wireless with an RT2500 chipset, the correct module loads and the machine is connected to the network, but with a "failed" IP address ( This also occurs with a wired connection. The exact error is:

err, wlan0: option 43 has zero length
failed to parse packet

It times out then assigns the failed IP address and connects to the network, but of course nothing works.

I use WPA psk and I have another laptop with the same configs and works perfectly with Slackware -current, so I followed the same routine to set this one up. When that didn't work, I backed up the existed /etc/rc.d/rc.inet1 and wpa_supplicant.conf, and copied the working files to the new setup. Same result.

There does not seem to be any information about this error either here on LQ, or on the net. I have certainly never encountered it before.

Because it connects with good signal strength, and because it also occurs with wired connections, I can only assume that it is related to WPA in some way. I have not reset the router because I have a number of other machines connected. All of the other machines work, and this one connects, so it is not hardware related.

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CentOS 5 :: Update To 5.3 Have Some Packet Conflicts?

Apr 1, 2009

I tried to update from 5.2 to 5.3. But I got the error message:

Downloading Packages:
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test

Transaction Check Error: file /usr/lib/gstreamer-0.10/libgstqtdemux.so from install of gstreamer-plugins-good-0.10.9-1.el5_3.1 conflicts with file from package gstreamer-plugins-bad-0.10.3-8.el5.rf file /usr/lib/gstreamer-0.10/libgstvideo4linux2.so from install of gstreamer-plugins-good-0.10.9-1.el5_3.1 conflicts with file from package gstreamer-plugins-bad-0.10.3-8.el5.rf

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CentOS 5 :: Under High UDP Traffic Condition - Cannot Receive UDP Packet

Jan 25, 2011

Under high UDP traffic condition, we find we cannot receive UDP packet (can be captured by tcpdump) from socket neither use bare "recvfrom" nor "select recvfrom " pair. Is there any similar problem reported from user?

Any tunning or socket establish option can help?

Or is there any improvement available from the latest version?

our using linux version is CentOS 5.5

ethernet driver version is Intel (R) Gigbait Ethernet Network Driver version - 1.3.16-k2

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Ubuntu Installation :: Package Error - Can't Identify Packet Id

Aug 9, 2011

I have been having a hard time with my Ubuntu OS it's been giving me an error in the system but as it tries to make an error report it fails the reason being it can't identify the packet id. Here the example of the error i've been getting while trying to update or install packages, when using the terminal sudo apt-get install f- or sudo apt-get install 3kb <this is what it gives>

E: Encountered a section with no Package: header
E: Problem with MergList/var/lib/apt/lib/apt/list/extras.ubuntu.com_ubuntu_dists_natty_main_i18_Tran slation-en
E: The package lists or status file could not be parsed or opened.'

Tried the Update manager within the Ubuntu OS but as it loads it gave me the same error report but this time stating I should report this to the 'update-manager'

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Networking :: FTP Client Not Retransmitting Packet After Server Is Not Reachable

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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Networking :: Server Sending RST In Middle Of Packet Transfer Reset?

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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Security :: /proc/net/packet Says My Server Is Acting As Network Sniffer - According To NSA Doc

Apr 25, 2011

So, the NSA puts out some handy documentation on locking down a RHEL server (running centos 5.6 x64 myself) here, [url]. Under "Ensure System is Not Acting as a Network Sniffer" on page 63, it says that if any numbers below the first line in /proc/net/packet, that it is acting as a network sniffer.

I get the following output:


Unless I've been pwned, I don't know exactly what could be causing this. Besides samba, nmap (compiled from source, not from yum), screen, and rtorrent, there's nothing I've installed beyond the fresh install I did a few days ago. I was not running nmap when looking at /proc/net/packet.

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Server :: Dhcpd - Keep Lease Even If Device Sends Expiration Packet?

Jul 13, 2011

I have a dhcpd server running CentOS and Webmin. I noticed in my lists of expired leases some of the lease times are only a few hours even thought I have lease length set to 1 week. I want to keep a lease for a week even if the device requests that it be expired. Is there some way I can do this in dhcpd? I am attaching a screenshot of some of my lease times listed in Webmin.

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Server :: Too Much Packet Loss While Running Mrtg To Graph Traffic

May 10, 2010

I am running Redhat linux 8.0 with 2.4.22 kernel. I am using this server for traffic shaping my static ip clients using tc. There are about 250 clients and I am running mrtg to monitor traffic via cronjobs each 5 minutes. When mrtg run I see too much packets loss in my network. What could be the problem in my server?
RAM is 1gb and processor is Intel Pentium D 2.66GHz.

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Programming :: Perl - UDP Server Receive / Send Packet To Host

Apr 1, 2010

I have found many examples out on the www for creating udp servers with sockets. The problem I am running into is after I receive the packet from a host I need to be able to send a custom made packet(I'm using RawIP / NetPacket to make my packet) back to this host. The only way to do this is seemingly through the send() function. This function however doesn't appear to allow me to specify which host to send my packet to.

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General :: Fatal Error: Raw.c:dlt_raw_encode(): DLT_RAW Plugin Doesn't Support Packet Encoding

Nov 2, 2010

I am trying to change the IP address of the traffic that has been stored. I have tried different commands:


however, either from these two commands end up with a following error:


when I searched for a solution and generic commands I used those two websites: website1 website2 Commands have been tested using a casual user account as well as a privileged one (root).

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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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General :: Fatal Server Error:PAM Authentication Failed, Cannot Start X Server

Jun 29, 2011

When I am trying to run the Xserver using the command startx I am getting the below mentioned error

xauth: creating new authority file /oracle/oracle10g/.serverauth.22555
Fatal server error:PAM authentication failed, cannot start X server. Perhaps you do not have console ownership?


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Server :: System Error - Authentication Failed For User Postgres

Mar 29, 2011

I made a system in CentOS5.5. I used Tomcat6 and PostgreSQL. But I couldn't enter my system. There are some error. And I don't understand what kind of error this.
JDBCExceptionReporter.logExceptions(100) | SQL Error: 0, SQLState: null
JDBCExceptionReporter.logExceptions(101) | Cannot create PoolableConnectionFactory (FATAL: Ident authentication failed for user "postgres")
"postgres" is username.
Is anybody knows anything about this error message.

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Red Hat :: Disabling IPv4 Packet Forwarding: Net.ipv4.ip_forward = 0 (CentOS 5.5)?

Oct 29, 2010

I'm forging a gateway server, We have 2 Internet connection that goes to a load balancer router, and goes to my centos server and from our server goes to a switch for Internet distribution or routing.

OS-CentOS 5.5
[root@server etc]# uname -srio
Linux 2.6.18-194.el5 i386 GNU/Linux

My eth0 and eth1 has the following configuration and IP

[root@server etc]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
# VIA Technologies, Inc. VT6105/VT6106S [Rhine-III]


Disabling IPv4 packet forwarding but i already changed it to 1 at sysctl.conf One of the online forum says i need to configure the named.conf deleted some and run it(named.conf) and successful but still when I run network service I still get the :"Disabling IPv4 packet forwarding: net.ipv4.ip_forward = 0" The network is getting the IP range but it doesnt get any Internet connection.

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OpenSUSE Network :: Network Not Work \ After Install All Packet On Test Internet / Update Was Error?

Jan 5, 2011

I install from openSUSE-11.3-NET-x86_64.iso. Installation was succesfull, but after install all packet on test internet / update was error. And after log in in installed system internet not work. I use router with DHCP

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CentOS 5 :: Get "Authentication Failed" Error When Logging In?

Apr 19, 2011

I'm taking over support on some linux machines at my work. I came across a CentOS 5.4 system that my users can't log into anymore. When I try to login as root at the console, I get an "Authentication Failed" error message. If I ssh, then the connection terminates. When I type the password incorrectly, I get the usual message about entering the wrong password, so I know my passwords are correct. These are all local accounts, not NIS or anything.

What I've done so far: I booted into rescue mode and changed the root password. No dice. I booted into single user mode and tried updated pam. Again, no dice.

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Networking :: Packet Spy On A Hub

Jan 25, 2011

I am in a hub(with switches and rooters) and i want to spy what packets everyone receives! if can i do this and if i can which tools i can use?

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Debian :: IP Packet Routing

Jan 27, 2016

I have recently upgraded a computer from Wheezy to Jessie, and I'm having trouble getting an internet connection shared via Ethernet by another computer (the provider) to work on it.I have activated the interface of the Jessie computer and configured a static IP on it in the same subnetwork as the provider's ethernet interface with the following commands:

Code: Select all# ip addr add dev eth0
# ip link set up dev eth0

I now would like to set the address of the provider as the default route with Code: Select all# ip route add default via dev eth0, but I get the following error message: Code: Select allRTNETLINK answers: File exists.

Indeed, when I run Code: Select all# ip route, the following comes up:

Code: Select alldefault dev eth0  scope link

I've tried to remove this default route to replace it with mine with Code: Select all# ip route flush table main and Code: Select all# ip route del default but these commands don't seem to work.

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Debian :: Creating A .deb Packet?

Mar 24, 2010

I have to do a .deb packet which will be placed in the repositories of the company.When this packet is installed, it only have to copy a plain text archive i've wrote before, to a path where it's being installed.The other requisite is that it have to watch if there's a program (vim) installed, if it's not installed, then the packet i have created shouldn't install.example:

# ls /home/loopin (as we see, this directory is empty)
# apt-get install mypacket


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Networking :: DNAT On First SYN ACK Packet

Aug 19, 2010

I am trying to simply address translate TCP packets from one destination IP to another destination IP (DNAT?) without getting the initial SYN packet. Is this possible? I do not think it is with DNAT since the conntrack needs SYN first.

I have given the command:

The problem is that the first packet that matches this rule will be the SYN-ACK and I suspect it is simply DROPPED.

I am sparing you the gory details of why I would do such a silly thing, but simply put; I need to intercept client-to-server packets through a tunnel, but allow server-to-client packets to follow through the regular network.

I have been working on this for many days w/o success and my learning curve is still steep. I can provide more details as needed.

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Networking :: DNS Raw Packet Structure?

May 19, 2010

My question is about the raw MX reply package structure. I've read the RFC and all relevant pages I could find, but I couldn't figure this one out. Say we do a google.com MX query.

The first answer (just the rdata part) will be: google.com.s9b2.psmtb.com But in the raw package, instead of the .com, you have c0 13. Then for the second answer, google.com.s9b1.psmtb.com, the raw package has, instead of psmtb.com, just c0 3a. So is the part after c0 a pointer towards another part of the message? Or what does it stand for exactly? I am puzzled by it, and don't know exactly where to ask... some of the networking people here might have a good idea.

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Networking :: Packet DETECTED From 1s And 0s?

Jan 11, 2011

From all the stuff that can enter an interface, how does it know when an IP packet has been *formed*? What if it's just random garbage entering there for whatever reason? Also, can Linux do other protocols besides TCP/IP? This would be the problem, as I said above.

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Networking :: Udp Packet Conflict ?

Jul 28, 2011

In application udp port listening with 3330 i am sending udp request from port to that is same port in the same machine....application works fine udp sending and receiving also fine.....for clarification ....is there any conflicts in the communication ?

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Programming :: Create Own Packet In NS2?

Apr 14, 2011

I want to create my own packet for aodv so how can i do? from where i should start?

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Programming :: How To Tunnel Packet

Apr 19, 2011

I want to develop program to put (tunnel) sniffed packets into another packet, i already have sniffer code to capture packet, can some one give me use full site or simple code to do that.

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Fedora Networking :: Receving UDP Packet In 12 ?

Feb 27, 2010

I wrote a program for transmitting an UDP Packet. It is properly received in Fedora core 2 machine while its not received properly in Fedora 12. I tried using Wireshack packet capture software which shows the protocol as DIS. Is there any service or setting i need to do for identifying the packet as UDP.

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