similar to: ip_forwarding

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

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

TEQL and Subnet problem I have a network topology shown below, and I am trying to use TEQL. My problem is: When I ping to P3.teql0 from P2 ("[P2]# ping 16.119.144.66"), the traffic can never go from P2.eth1, and all traffic only goes to P1.eth0. What P2.eth1 (16.119.144.33) did is broadcasting an ARP asking for the MAC address of 16.119.144.66, although I have specified the route to

dear All, I'm facing this routing problem, the setup is actualy part of ltsp, but I think this problem is Centos-specific. The server is a Dell Poweredge R210. The install is standard 6.4, updated. I have one nic facing the public internet: vi /etc/sysconfig/network-scripts/ifcfg-em1 DEVICE=em1 BOOTPROTO=none HWADDR=d4:ae:52:c1:28:2b NM_CONTROLLED=no ONBOOT=yes TYPE=Ethernet

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)

Sorry to post this here, but since last week I've posted to Fedora's mailing list, pptp-devel's list, and linuxgeneral forum. No one has given much for answers, or the people that have replied have not understood what I'm looking for. Hoping someone here can. For the record, I'm doing this on FC3 not CentOS. Anyway, if anyone can provide assistance I would be very appreciative.

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, If I disable ipv6 via the kernel command line, ipv6.disable=1, then systemd-networkd fails to bring up any interfaces. Removing the option and networking works as expected. Phil.

Firewall users, My apologies as I''m not on this list, so please respond directly as well as to the list. I did try to search the archives and didn''t find any hits, although the search did not like searching for terms with underscores in them (both clear_firewall and ip_forward). I was trying to understand why, when running shorewall stop, even though it echoes IP

I have a server whit 2 interfaces of network, where eth0 is the interfaces connetc to internet and eth1 to the internal network. This server hace a Squid only, but i setting the iptables for protection to the server. Iptables run from script and in this script i setting the redirection for the other server in my internal network to port 80 and 443. I follow the diferent how to and many manual, but

On Tue, 2016-06-21 at 15:46 +0100, Always Learning wrote: > On Tue, 2016-06-21 at 16:24 +0200, Alexander Farber wrote: > > > *nat > > :INPUT ACCEPT > > :OUTPUT ACCEPT > > :PREROUTING ACCEPT > > :POSTROUTING ACCEPT > > -A PREROUTING -p tcp --dst 144.76.184.154 --dport 8080 -j REDIRECT > > --to-port 80 > >

I thought that the below email would be of interest to LARTC readers. I wasted quite a bit of time tracking down this "feature" (bug?). Any comments that shed light on this would be appreciated. In short, "tc filter" + htb + bridging works only with ip_forward off. Andrew Athan ----------------------------------------------------------------------- All: It seems that

Hello Gordon and others On Tue, Jun 21, 2016 at 4:13 PM, Gordon Messmer <gordon.messmer at gmail.com> wrote: > On 06/21/2016 02:30 AM, Alexander Farber wrote: > >> -A PREROUTING -p tcp -m tcp -d 144.76.184.154/32 --dport 80 -j REDIRECT >> --to-ports 8080 >> > > > I think you have the ports backward, here. > here the problem description again: I have

Dear All, I have one centos box ( centos 4.0 ) which is connected to MSI wireless router....... And which is connected to my ISP MODEM. I incorporated wireless router so that I can use my laptop from any of my rooms. Now this Centos 4.0 box is my home server machine. The MSI Wireless Router has DHCP server enabled. Wireless router has provided each address to my machines basically internal IP

Greetings, I'm rebuilding a machine to function as a gateway/router to Verizon DSL. It has two NICs eth0 and eth1 (static set to 192.168.1.1). eth0 connects to the DSL modem. I've setup Verizon DSL usine pppoe-setup, and it works. I can connect from home machines to the server (192.168.1.1); while logged in to the server, I can connect to both the internet, and the home machines.

We just went to replace the bridge/firewall services one one server with the same on another. It's pretty simple, and I literally cloned (w/ rsync) a third server that does this onto the one that will be the new one. Then copied the /etc/sysconfig/iptables from the one being replaced, and brought it up this morning. Nope. We had to put everything back the way it was. The new one sees the two

I need to get this working. I have a single interface eth0 with a primary adress of x.x.214.162 on a /30 block network. This interface is properly set up and works fine, however, I also have five aliased adresses on the same interface: eth0:1 @ x.x.6.230, eth0:2 @ x.x.6.235, eth0:3 @ x.x.6.240, eth0:4 @ x.x.6.245, and eth0:5 @ x.x.6.250. All of these adresses are on a /27 block network. After

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

Hello again, unfortunately the following /etc/sysconfig/iptables file does not work: *nat :INPUT ACCEPT :OUTPUT ACCEPT :PREROUTING ACCEPT :POSTROUTING ACCEPT #-A PREROUTING -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 8080 -A PREROUTING -p tcp -m tcp -d 144.76.184.154/32 --dport 80 -j REDIRECT --to-ports 8080 COMMIT *filter :INPUT DROP :OUTPUT ACCEPT :FORWARD DROP -A INPUT -m state --state

TEQL and Subnet problem I have a network topology shown below, and I am trying to use TEQL. P1, P2 and P3 are three linux machines, and each has two network cards. P2 and P3 are connected in two ways: (1) directed connection between P2.eth0 and P3.eth0; (2) connection via P1. P1 acts as the gateway. TEQL is installed on P2 and P3 to load-balance packet transmission by round-robin sending packets