I've got Tyan S4989 with gigabit ethernet controller Intel Corporation 82571EB. Sometimes server starts drop packets and doesn't respond to any connections and all logs doesn't contain any errors. iptables and SELinux switched off on CentOS 5.3(2.6.18-128.1.6).
View 3 Repliesi need to write a program in c that can sniff packets from Ethernet and distinguish RTP packets from Non-RTP packets, i have no idea what should i do
View 9 Replies View RelatedI have tried to google it around and couldn't find any good solution for it. What I want is to hook up to the kernel network hooks and for example investigate all of the packets (maybe keep some in the buffer and drop in the kernel so I could send them out lets say 10 minutes later) but from a C / C++ program perspective / level. I know it can be done via iptables but isn't there a way to do it from a program ?? I have found a library called ipq but apparently doesn't work with kernel 2.6.x anymore.
View 10 Replies View RelatedI'm trying to drop all packets from the internet that use a fake ip address so they appear to come locally.
Do I need both lines or only the first ?
--append INPUT ! --in-interface lo --source 127.0.0.0/8 --jump DROP
--append INPUT ! --in-interface lo --destination 127.0.0.0/8 --jump DROP
I bought a Cisco 1841 to study for a cisco certs. In iptables terms filtered packets are -j REJECT instead of -j DROP. To make things worse telnet and ping replies are on by default.
View 5 Replies View Relatedhow can i drop igmp port 0 packets with iptables rule? my log file is full of this router advertisement.
View 2 Replies View RelatedI'm trying to create and send my own ETH packets from inside the kernel.My objective to send the packages from layer 2 by building my own skbuffand sending itusingdev_queue_xmit().anyone did it or have examples of how to do it ?I tried to build my own skbuff without success.
View 1 Replies View Relatedthe server is restarting once the syslogd restart. I checked the /var/log/ message.
View 9 Replies View Relatedtrying to configure a Centos 5.5 server (simple file server with DHCP and DNS relay). I configured and tested the config (by 'service dnsmasq configtest') of dnsmasq and I got the message 'dnsdomain:host unknown (translation of the real message : hte inconnu) and I didn't find where I could define this host ! The hostname of the server is well defined and I can see it from all Windows PC's on the LAN. dnsmasq starts (with hte same message as in configtest) but when querying DNS from PC's te.g. trying to surf the Internet), I don't get replies (3 DNS servers are also well defined and operational).
View 2 Replies View RelatedI've started facing the weirdest problem. I have to restart the ethernet interface a couple of times a day and everytime i do that the server locks up completely and i have to hard reboot it.info: recently shifted to a new server, all new components and new installation, OS version CentOS 5.6
View 1 Replies View RelatedCan anyone tell me what command can be used so that the Linux Centos Server starts mysqld, httpd and ftpd services at boot time automatically?
View 2 Replies View Relatedi have a linux server runnig oracle applications. i need to access this server from putty using ssh through internet. i did by registering my static ip with the dnydns.org and i am able to connect to the server. but now there is no security to authenticate any user as any one knowing the password can login to it.
i thought of configuring the firewall of linux server but the client ip`s are not static and they change continiously. so thought of keeping one more pc between the server and the router which will do the work of authenticating. but i am confuse as how to configure it to allow the packets coming from the internet after authenticating and to by pass the packets generated from internal LAN?
I use wireshark (ethereal) to moniter the traffic passing through the NIC. I find that system always sends "bad checksum" TCP/UDP packets. In CentOS 5.2 this is seldom. Does your system (5.3) send "bad checksum" TCP/UDP packet ?
View 2 Replies View RelatedI have just installed a fresh copy of CentOS 5.3 and from the get-go, the NIC started dropping packets like crazy. I even closed the port on the switch,. moved the cable to a different port,. All yield the same "dropping packets" behavior. Zero on the errors, just dropping packets. Should I stick a diff nic instead?
View 1 Replies View RelatedI am running Raspbian, on my Raspberry Pi I have plugged in a Ethernet cable : eth0 and a Wifi Usb Dongle : wlan0
I have my etc/network/interfaces file configured like so
Code: Select allauto lo
iface lo inet loopback
iface eth0 inet dhcp
iface eth0 inet static
address 192.168.1.100
netmask 255.255.255.0
gateway 192.168.1.1
[Code] .....
When trying to connect with SSH to address 192.168.1.100, I get a connection, when trying with address 192.168.2.200, SSH returns Network Error: Connection timed out.
Also receive no response when trying to ping 192.168.2.200 from a windows machine
If however Iadjust the wlan0 block in etc/network/interfaces to the following
Code: Select alliface wlan0 inet static
address 192.168.1.200
netmask 255.255.255.0
I am able to connect to wlan0 in SSH to address 192.168.1.200, and I also receive requests when ping 192.168.1.200 from a windows machine. How can I use a different subnet for my wlan0 iface...
I have very strange problem with kernels 2.6.33 and 2.6.34. I have a wireless card Linksys WMP200 using rt61pci. It connects just fine using WPA2 and works, but in less than 20 minutes I still can reach any machine on my network, but this machine cannot be reached by the others (i.e. before these 20 minutes others can ping me). With default kernel 2.6.26 (Lenny) all is OK. I do not use any firewall. When this happens logs do not change - wpa_supplicant's log is normal (associated), syslog is fine, dmesg shows no errors. Sofar I have tried this:
1. acpi=off as boot parameter
2. both new kernels 2.6.33 and 2.6.34 are compiled with CONFIG_CF80211_DEFAULT_PS disabled
3. iwconfig wlan0 power off
4. Tried ndiswrapper. The device is up and scans fine but wpa2 is not working...
5. Compiled a kernel without ACPI
This is all I did without any luck and I really need the new kernels because I have a quatech device attached to the machine...
I'm trying hard to run an openvpn server on a openvz VPS, the problem is packets sent from openvpn server process, doesnt reach the client, so connection is never stablished (I run tcpdump on server and wireshark on client to carefully investigate whats wrong), the first guess is that a kind of firewall is blocking traffic (I tried connecting to server through different ISP's but it's possible the national network provider applied some filtering but it cant be on IP,src port or dst port as I'd tried different configuration.
what about deep packet inspection technics, is it possible to block my traffic?) but at exactly the same time I can transmit UDP packets using netcat from server to the guest. there is no firewall enabled in between, I had tried, tcp and udp, tried both open vpn and openvpnAS and tried any thing one can imagine! the VPN is configured as a routed (TUN) type on debian
if am using --log-prefix "BANDWIDTH_OUT:" --log-level 7 to capture packets, I think is there a way to view these?
View 4 Replies View RelatedI've got an odd one, running the CentOS 5.3 kernel, I'm experiencing lost packets on one of the two NICs when tested with ping. In this particular case, it's the internal NIC that causes the problem, pings from the CentOS machine to the public network over the external NIC never loses packets.(internet)<-->CentOS<--> (LAN) <--> desktop
- CentOS can ping the internet with no packet loss
- CentOS loses packets when pinging the desktop(s)
- Desktops lose packets when pinging the CentOS box
- Taking the LAN switch out of the equation still results in lost packets
- When the LAN NIC on the CentOS box "acts up", all desktops start losing packets
I've swapped out the NIC a few times for different makes/models, and I'm still getting lost packets to/from the internal network. So, I'm thinking that there's something squirrely going on higher up in the network stack. But evidently, not enough to log anything to the console or into the log files.At the moment, I'm leaning towards it being an issue with the nForce 750a SLI chipset. But it's odd that it only affects the LAN card and not the WAN card. I've even swapped the positions of the two NICs, and the problem persists on the LAN card.The other possibility is that iptables is eating packets silently, but in a random fashion.
im compiling from source on a old rig i have, its running ubuntu 10.10 server edition and i finaly got all the dependencys installed to a point where ./configure actualy worked. but whne i try and run make this is what i get.
[code]...
After I upgraded from 5.4 to 5.6:
I can see the desktop drop down menu when I log in as user root
however I can not see any of the desktop drop down menus if I log in as regular user
I have setup hostapd and a bridged setup with br0 bridging eth0 and wlan0. The setup works but unfortunately not on bootup. The reason is that the bridge can't add iface wlan0 because it is down for some reason at this time. When hostapd is running (after the network script) the interface is up and can be added to bridge via
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I have installed CentOS 5.3 on my PC which has an Atheros AR8121/8113/8114 Gigabit Ethernet. Unfortunately 5.3 has no drivers for this LAN Card. I searched the Google for drivers but was unable to find any. Does the 5.4 has them? If yes then how can i upgrade it to 5.4 without Network connectivity?
View 11 Replies View RelatedI was try to compile the drirver from cd asus, but my lan card still not detected in centos 5.3. when i bringing up eth0 its show like : "the atl2 device eth0 does not to be present, delaying initialization."iwas suft on google some driver but all driver just to centos 5.3 when i install the rpm it does not work. i love centos i dont want to change my lovely centos.
View 10 Replies View RelatedI've installed from the CD the Centos version 5.5. When I try to connect to Internet I can't because I received some errors. I've the Intel Corporation 82801CAM (ICH3) PRO/100 VE (LOM) Ethernet Controller also a wireless slot (I've the wireless card DWL-G650+) When I turn on the pc and I go to "Ethernet Device", I see set: peth0 (Intel Corporation 82801CAM (ICH3) PRO/100 VE (LOM) ETHERNET CONTROLLER) and also set "Bind to MAC address": fe:ff:ff:ff:ff:ff I've set manually the IP address (I'm under router). Status is "Active" but can't go on the Net. When I change to "eth0 (Intel EtherExpress/100 driver)...sometimes become "Active" an other times said that the MAC address is different or to check the cable because can't find the IP. What can I do?
View 5 Replies View RelatedI've installed a new fresh Centos 5.5 ..and after a lot of work..something starts to work (X now works with the new ATI HD5145 using ATI drivers) but i've a serious problemThe ethernet controller JMC250 JMicron PCI EXPR. doesent work at all so my notebook is out of the world !!!Here is some infos:rpm -q centos-release
centos-release-5-5.el5.centos
rpm -qa kernel* | sort
kernel-devel-2.6.18-194.el5
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i have a centos 5 and i cant access to the LAN or Internet because , i cant create a network connection , i try to say My Ethernet dont appears,and i cant add any connections.i id thisTerminal:Quote:sudo iwconfig
View 4 Replies View RelatedI am using asus p5ld2-x/1333 motherboard,I installed the centos ,Centos saw other drivers but didn't see ethernet card.I am not connection the internet.
View 2 Replies View RelatedPl can anyone guide me to connect centos 5.5 using ethernet port to ADSL Broadband modem which is configured in PPPoe mode?
View 19 Replies View RelatedI'm trying to use and old Dell Dimension 2350 workstation with 1GB of RAM and a 200GB drive as a home server. I boot the CentOS 5.3 install DVD, get to the splash screen and hit ENTER to start the install. The install routine starts and then kernel panics with a very long trace I can't make sense of. I've used the DVD for other installs so I know the media is good.Are there any known quirks to installing linux on a Dimension 2350? Maybe some kernel line parameters like no acpi?? As a test, I took an Ubuntu server cd, and the install actually completed but on reboot it kernel panicked with a similar long trace error. Obviously this is most likely a hardware issue.
View 4 Replies View Related