similar to: net.ipv4.conf.all.forwarding

Recently, someone or something has been turning off IP forwarding on my CentOS server: -------------------------- [tim at william NumberTheory]$ sudo sysctl net.ipv4.ip_forward net.ipv4.ip_forward = 0 [tim at william NumberTheory]$ sudo sysctl -w net.ipv4.ip_forward=1 net.ipv4.ip_forward = 1 [tim at william NumberTheory]$ sudo sysctl net.ipv4.ip_forward net.ipv4.ip_forward = 1

Hi, I just migrated my office's server from Slackware64 14.1 to CentOS 7. So far everything's running fine, I just have a few minor details to work out. I removed the firewalld package and replaced it by a simple Iptables script: --8<---------------------------------------------------- #!/bin/sh # # firewall-lan.sh IPT=$(which iptables) MOD=$(which modprobe) SYS=$(which sysctl)

Good Evening, I am trying to forward packages on an internal device using iptables: /sbin/iptables -A FORWARD -i eth0 -o eth0 -m state --state NEW,RELATED,ESTABLISHED -j ACCEPT but the packages are still blocked, e.g.: Feb 6 20:58:28 firewall kernel: DROP-TCP IN=eth0 OUT=eth0 SRC=192.168.100.177 DST=172.28.2.184 LEN=40 TOS=0x00 PREC=0x00 TTL=127 ID=16609 PROTO=TCP SPT=7166 DPT=3590 WINDOW=0

Hi, I have three linux machines, and I want to let one of them forward packets betwen the other two. The forwarding node has two ethernet cards, connecting the two two machines respectively. However, when I ping between the two end points, the forwarding node can receive the ping requests at its eth0, but it never forwards them to its eth1. So is the reverse direction. The forwarding node is

I have a fresh installed CentOS 5.3 server which should route traffic between two networks like this: network A (Internet) -- eth0 (default gw) : server : eth1 -- network B (LAN) I have set in sysctl.conf net.ipv4.ip_forward = 1 and routing works fine like this. But when I switch on the iptables service (with default setup, configured when installing the server), routing stops working (or at

We have 10 SuperMicro PDSMi+ 5015M-MTs that are panic'ing every few days. This started shortly after upgrade from 6.2-RELEASE to 6.3-RELEASE with freebsd-update. Other than switching to a debugging kernel, a little sysctl tuning, and patching with freebsd-update, they are stock. The debugging kernel was built from source that is also being patched with freebsd-update. These systems are

Hi, As a next question to my building this server. I'm nogt able to get a full verbose dmesg. Probably because the kernelbuffer for it is too small. I know there used to be a kernel option to increase it. But I can not find it with the setting in NOTES or any other place I looked.... Is it still there? Thanx, --WjW

I''m trying to use my VPS server (single interface of course) as somewhat of a VPN gateway to my other location (which is not accessible directly from some places) where the openvpn server is running, and am kind of lost as to what to try next. I tried a redirect rule, but apparently shorewall didn''t like that (it just failed to start). I tried adding the rules via

As part of my initial KVM host on C8 deployment, I decided to set up some HA features on the new host, specifically NIC teaming. Teaming seems to be bond++ of a sort, so I thought I would at least try it.? So here's the scenario: 1.) Server with two gigabit ethernet ports, two Cisco switches. 2.) During install, used the 'Server with GUI' group and added the virtualization

I first met this problem when our (60 students) internetgateway refused to boot its new kernel, it was a 4.7-RELEASE. Then i loaded the old kernel and went home to check if my 4.8-STABLE does likewise. And the answer was yes! Both kernels were GENERIC + these options taken from the dummynet man pages: options DUMMYNET options NMBCLUSTERS options HZ When i boot the machine

First, I'd like to configure my system to forward ip, to act as a gateway for my network. I've always used a script during startup to do this: echo 1 > /proc/sys/net/ipv4/ip_forward iptables -t nat -A POSTROUTING -o ${UPLINK} -j SNAT --to ${IP_NAT} This works fine, however I want this permanent so I don't have to run the script on startup. I have the firewall setup with SNAT

I have a CentOS 4 server that acts as a gateway for a small LAN. The lower half of the 192.168.144 address space is the LAN on eth1, the upper half is the WAN on eth0, and the default route is to 192.168.144.254 which is my DSL router; this has been working fine for years. However, it's recently become convenient to connect the server to a VPN from time to time, for which I've set up

Hello, I think this needs a few more eyes: http://lists.freebsd.org/pipermail/freebsd-scsi/2009-January/003782.html In short, writes are slow, likely do to the write-cache being enabled on the controller. The sysctl used in 6.x to turn the cache off don't seem to be in 7.x. Thanks, Charles ___ Charles Sprickman NetEng/SysAdmin Bway.net - New York's Best Internet - www.bway.net

I understand that the contents of /etc/sysctl.conf should be read and executed at system startup. However that never happens and I have to run sysctl -p after every reboot to get the settings I want. This is happening on every CentOS machine and VM I have. I can see in the startup scripts that "sysctl -e -p /etc/sysctl.conf >/dev/null 2>&1" is run at start up by the

If I execute these via command line, will they persist after a reboot? Or, should I be putting these into a file like /etc/sysctl.conf? --------------snip-------------- /sbin/sysctl -w net.ipv4.tcp_max_syn_backlog=2048 /sbin/sysctl -w net.ipv4.tcp_fin_timeout=30 /sbin/sysctl -w net.ipv4.tcp_keepalive_intvl=10 /sbin/sysctl -w net.ipv4.tcp_keepalive_probes=7 /sbin/sysctl -w

Hello everyone, I am trying to tweak some of the sysctl tunables for the ix (ixgbe) driver in FreeBSD 9.2 since I am experiencing less than ideal performance and it seems like I can't find any: # sysctl -a | grep -i ixgbe device ixgbe I am running 9.2-RC4. Any input appreciated. Thanks, -- Rumen Telbizov Unix Systems Administrator <http://telbizov.com>

Hi. I have a system with two network cards -- eth0 is a public ip address and eth1 is on an internal network. Now I have all the packet forwards enabled, and there is a route from eth1 to the internal network, but if a computer on the internal network sets his gateway to the box, he can''t traceroute past the box to the internet. There are no iptable rules yet. Here is the routing

Hello all, I’m currently trying to figure out how to forward ports to guests that are on a NAT Network. I have followed the directions on https://wiki.libvirt.org/page/Networking under the “Forwarding Incoming Connections” Section and get connection refused when attempting to connect. System: Ubuntu Server 18.04.1 Virsh / LibVirtd Version: 4.0.0 Here’s the contents of /etc/libvirt/hooks/qemu  

Hello, I want to redirect one local port to another. I am using the following: iptables -t nat -A PREROUTING -p tcp --dport 7003 -j REDIRECT --to-ports 80 and testing it by telneting to localhost on port 7003. It works on Centos3, not on Centos4. No luck with this either: iptables -t nat -A PREROUTING -p tcp --dport 7002 -j DNAT --to 127.0.0.1:80 Am I doing something wrong? Or did something

Hi, I''m wondering if there''s any simple solution. This problem looks very simple, so maybe there''s a simple solution that I''m missing, but I couldn''t do it yet. I''m configuring an wireless ad-hoc network with three laptops; A ---- B ---- C where A and C can only talk to B, and B can talk to both A and C. A and C cannot talk to each