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  • Remotely push DNS server to client via OpenVPN

    - by wishi
    Hi! When I try to push a DNS server via the OpenVPN server-config I don't get that server to be the first DNS server on the connected client system. It ends up being specified as an alternative DNS server. push "dhcp-option DNS 89.238.75.146" # DNS-Server 1 (local djbdns) To overcome certain network restrictions, if they're at place, I use 443…

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  • How does Router know where to forward packet

    - by kornelijepetak
    If several computers with local addresses (192.168.0.#) are connected to a router and each computer opens a web browser and requests a page over HTTP, when these TCP:80 packets are sent out, the router switches the local address with the static IP of the router (i.e. Provider given IP) so the server can reply to the appropriate address. But…

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  • How to configure firewall to allow using a specific port

    - by user174416
    I am trying to make tcp ip connection to a server xxx.xxx.xxx.xxx with port xxxx. But I am getting error message "10061 connection refused". I think firewall on the server is stopping my program to access that port. How can I configure the firewall of server to allow my program to use that port. I had asked this question on stackoverflow…

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  • Meaning of tcp_delack_min

    - by Phi
    Hi, the current Linux Kernel (e.g. 2.6.36) uses Delayed Acknowledgments (delack). In /include/net/tcp.h it says: define TCP_DELACK_MIN ((unsigned)(HZ/25)) So, for a Kernel using a HZ value of 1000, an ACK should be delayed by a minimum of 40 ms. However, RFC 2581 says a TCP implementation should acknowledge every second full…

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  • nat with iptables, re-connecting fail within about 3 minutes

    - by xpu
    i constructed a nat with iptables, as following: echo 1 > /proc/sys/net/ipv4/ip_forward iptables -t nat -I PREROUTING -p tcp --dport 9000 -j DNAT --to xx.xx.xx.xx iptables -t nat -I POSTROUTING -p tcp --dport 9000 -j MASQUERADE service iptables save service iptables restart the configuration worked fine, but there was a problem…

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  • Solaris TCP stack tuning

    - by disserman
    We have a large web project (about 2-3k requests per second), using haproxy (http://haproxy.1wt.eu/) as a frontend and load balancer between the java application servers. The frontend (haproxy) is running on Linux but we are going to migrate it to the Solaris 10 as all our other servers are running under Solaris. After switching a…

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  • network latency, TCP and UDP packets

    - by user115848
    Hello recently my network has started to cause me lots of problems. I have a cable modem, connected to a tp-link router (with some port forwarding). Everything was working fine then i started to get lots of udp (port 53) "UNREPLIED" logs in the router. Now there are tcp UNREPLIED logs too. This is causing lots of latency and failed…

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  • A duplicate name has been detected on the TCP network

    - by MSedm
    When I installed my domain controller and DNS, I had 2 NIC on the server. Both NIC has its own IP address. NICs are not teamed, they are seperate and ip address are in the same subnet. Both IP address are now registered in the DNS. i found them in Forward and reverse lookup zone. Everything working ok except the following error in…

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  • Ubuntu 12.04 LXC nat prerouting not working

    - by petermolnar
    I have a running Debian Wheezy setup I copied exactly to an Ubuntu 12.04 ( elementary OS, used as desktop as well ) While the Debian setup runs flawlessly, the Ubuntu version dies on the prerouting to containers ( or so it seems ) In short: lxc works containers work and run connecting to container from host OK ( including…

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  • Help understanding linux/tcp.h

    - by Chris
    I'm learning to use raw sockets, and im trying to prase out the tcp header data, but i can't seem to figure out what res1, ece, and cwr are. Through my networking book and google i know what the rest stand for, but can't seem to find anything on those three. Below is the tcphdr struct in my includes area. Ive commented…

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  • Sharing a COM port over TCP

    - by guinness
    What would be a simple design pattern for sharing a COM port over TCP to multiple clients? For example, a local GPS device that could transmit co-ordinates to remote hosts in realtime. So I need a program that would open the serial port and accept multiple TCP connections like: class Program { public static void…

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  • How to know the source of certain TCP traffic on AIX

    - by A.Rashad
    We have two AIX boxes, one for production system and another for testing. both systems are running ATM machine switches, where the ATM device is connected via TCP socket. we had an issue on production system where the machine would power off or get disconnected but the netstat -na | grep <IP of machine > would…

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  • How to know the source of certain TCP traffic on AIX

    - by A.Rashad
    We have two AIX boxes, one for production system and another for testing. both systems are running ATM machine switches, where the ATM device is connected via TCP socket. we had an issue on production system where the machine would power off or get disconnected but the netstat -na | grep <IP of machine > would…

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  • outlook iptables configuration

    - by mediaexpert
    I've a Debian mail server, but only the outlook users can't be able to download the emails. I've seen a lot of post about some kind of forwarding port configuration, I've tried some commands, but I don't be able to solve this problem, please help me. below INPUT and FORWARD iptables: Chain…

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  • Iptables - forward email ports?

    - by Emmet Brown
    im trying to open some local ports (LAN) and then re-direct them to another server (WAN) using iptables. Here is my config: #WAN allow-hotplug eth1 auto eth1 iface eth1 inet static #Tarjeta red WAN address 192.168.2.2 gateway 192.168.2.1 netmask 255.255.255.0 #LAN allow-hotplug…

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  • Issues with forwarding Iptables

    - by Ricardo Rios
    I have some issues with my redirectioning lines on iptables, it seems it does not work, any help will be appreciated iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE echo 1 > /proc/sys/net/ipv4/ip_forward iptables -t nat -A POSTROUTING -s 192.168.2.0/24 -o eth0 -j SNAT --to…

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  • cannot send emails to other Web servers

    - by developer
    I'm trying to limit my server's open ports in CSF. The IPv4 port settings include: # Allow incoming TCP ports TCP_IN = "22,25,53,80,110,143,443,587,3654,53343” # Allow outgoing TCP ports TCP_OUT = "22,53,80,113,443,465,995,3654" # Allow incoming UDP ports UDP_IN = "53" # Allow…

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