the process by which data packets on communication networks are forwarded into the direction of their ultimate destination by routers.

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Benchmark software IP router performance using single Linux device

I'm testing routing performance using software Linux router (in-kernel). My usual test setup has 2 additional PCs: one PC is packet sender (packet generator) and other PC is receiver. There is ...
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184 views

Routing on CentOS with multiple subnets

I have a server with 2 VLANs on a NIC, configured as follows: eth0 Link encap:Ethernet inet addr:192.168.10.20 Bcast:192.168.10.255 Mask:255.255.255.0 eth0.10 Link encap:Ethernet inet ...
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201 views

Some client in my network, sometimes can't ping Gateway and DNS server

I've a local network with 100-150 clients, one Core Switch and 10-12 switch that Switchs are connected to the Core Switch and clients are connected to switchs. In my network sometime some clients ...
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12 views

Email duplicated from Barracuda Cloud layer?

Incoming email to our domain first goes to the Barracuda Cloud Protection Layer before being passed to our local Barracuda 300 antispam appliance. It then goes to our email server (CommuniGate). ...
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87 views

VPN client names incorrectly resolve to their private LAN IP addresses, DNS Issue?

My office network is running a single Windows Server 2012 Standard as Domain Controller, DHCP, DNS, NPS, and RRAS. DHCP has a scope of 192.168.1.50 through .200, and RAS is configured to get IP ...
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28 views

Command “ip rule show” not showing anything

I try to list all routing rules, and as far as I know this should be accomplished with the "ip rule show" command. In my case there is nothing returned (really nothing at all). Why? Could it have to ...
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131 views

Multiple VPN connections on the same Computer at the same Time with the same Subnets

What's the best approach for such scenario? : One machine „GATEWAY” SERVER with configured multiple VPN connections. PC1, PC2, PC3, PC4 are the clients that with the same time wants to connect to ...
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140 views

pfSense on failover won't route with GW on a completely different subnet

I'm trying to install a pfSense with an IP failover (requirement from online.net) but I can't get the server to route the requests. Last time I got it working with the following commands: route ...
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82 views

Cisco 1841 - Acting as a PPPoE terminator?

We have 2x Fortigate 200B firewalls that we wish to operate in Active/Active HA mode - though, obviously, they cannot do this with PPPoE/DHCP enabled on the externally facing interfaces. To overcome ...
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98 views

Load-balancing PPTP connections

I'm trying to load balance two PPTP connections, connected to the same server. I use the following script, but there is no send and receive via PPTP connections. What part am I doing wrong? Are there ...
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95 views

redirect http traffic through ppp0(vpn tunnel)

So I have this tunnel connection with a VPN on interface ppp0, I need to redirect the traffic through that vpn, of course if I do route add default dev ppp0 it will redirect all the traffic through ...
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1k views

PPTP defaultroute. Want to route all traffic via ppp interface

I'm experiencing a problem described here: http://pptpclient.sourceforge.net/howto-diagnosis.phtml#lots_of_data. If I use defaultroute in peer conf or manually add route add default dev ppp0 ...
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70 views

how to whitelist ip, port, protocol and app on a router?

I am looking for the simplest but robust solution to allow user accounts under Windows Server 2012 to use GitHub.com with the GitHub app, but otherwise not a peep is allowed from the server to reach ...
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201 views

Fortigate VPN can't reach site

I've two Fortigate's here and I use one of them for each site. Site A Site B 192.168.2.0/24 <---------- VPN ...
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247 views

Creating a multi-wan/isp failover router where wan IPs are dynamic on Debian

I'm having an incredibly hard time creating a basic router on Debian which has connections to two ISPs where the ip addresses are dynamic. I don't need bonding, I really just need some way to detect ...
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84 views

Racoon IPSec tunnel VPN - can connect to everything, except VPN host

I've got an Android client connecting to a racoon IPSec VPN endpoint using Xauth and PSK. Everything pretty much works as expected - the client can ping the internet and can also connect to other ...
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54 views

OpenVPN - Routing from one VPN into another

I have the following situation. I have a root server, which acts as a VPN server for my company network and as a VPN client to multiple customer-networks. Every seperate connection works (I can ping ...
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73 views

How to set mark on packet when forwarding it in nat prerouting table with rp filter 0?

I have a serious problem with my server ubuntu 13. I have two ADSL lines and an internal network as follows. i.imgur.com/v4ddHXf.png (URL IMG) IP redirections made ​​two because there are two older ...
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68 views

Issue with routing across two networks with DHCP and NAS involved

I have a Linux network set up with three sub networks 192.168.1.0 (chaos), 192.168.3.0 (chaos-hs), and 192.168.5.0 (ute-netz) with three machines casimir, ute, raspberry, a nas server nas and a router ...
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56 views

No such device error when trying to create IPSec tunnels

I'm trying to establish parallel tunnels between the same two routers, each of which route traffic from slightly different subnets. I can always set up the first tunnel without a problem, however when ...
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35 views

simple subnetting, regarding vpn

i am using 2 cisco rv180 to build up a ipsec tunnel. thats working. but i cant get any packets trough the tunnel. first i was using: local: 10.0.0.X 255.0.0.0 remote 10.0.1.x 255.0.0.0 but 0 ...
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222 views

Using OpenVPN only for specific applications on Linux

I have a working PPTP VPN with very specific routing requirements that I need to replace with OpenVPN due to issues with our ISP, and I am having issues adapting my routing rules to OpenVPN. I only ...
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25 views

SonicWall VLAN Device Redirection

I have a device (Network Attached TV tuner) I use on my X0 VLAN. I have a wireless (W0) device that I would like to be able to access this device on my VLAN. The problem is right now the devices ...
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60 views

Redhat 6.1 LVS (DR) over private subnet

I am trying to run LVS on RHEL 6.1, but with traffic from the routers to the real servers over a private subnet. with direct routing (behold this drawing: http://i.stack.imgur.com/aJ22w.png) ...
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149 views

Multiple virtual interfaces with multiple openvpn interfaces

I currently have 4 interfaces with static IP addresses from the local network; eth0:0 eth0:1 eth0:2 eth0:3 I also have 4 OpenVPN TUN interfaces which are connected to various servers around the ...
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59 views

MPTCP router - How can i share access to LAN network?

MPTCP is a emerging protocol that is able to split one TCP session over multiple links. In order to do that the source and destination have to be MPTCP capable. I have configured MPTCP on a linux ...
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32 views

Webserver with two seperate connections without masquerading?

I've got a QNAP x86 NAS with 2 GBit-LAN interfaces running an Apache Webserver. I've also got two seperate internet connections with two seperate public ip's that have two seperate dns-entries. As ...
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78 views

Static Routes for LXC Container

I have set up an LXC Container to have an IP Address from the same Subnet as the Host (i.e. a Bridge Setup) on Ubuntu 12.04LTS. The Host/LXC does not assign any adresses, this is done inside the ...
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172 views

Using public interfaces on a server connected through a GRE tunnel

I'm pretty new to networking so please forgive any terminology mistakes. I have 2 servers connected with a GRE tunnel. Server1 (10.0.0.1) ----> Server2 (10.0.0.2) I want to be able to bind to the ...
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29 views

openVPN as a way to connect to a LAN by another client, different from server

Setup: one LAN handled by a router without a publicly available IP address but without any outbound connection restrictions ("target LAN"); a separate server publicly reachable from the Internet ...
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169 views

ASP.NET MVC 3 - Routing Rules in web.config

Does anybody know if the IgnoreRoute() directives fire on the 1st matched rule like Apache directives or do they act differently? I would like to route my elmah.axd to a different location than my ...
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40 views

Two network interfaces access from the third subnet

I faced the following problem. There is server (Ubuntu 12.04) with two NIC that have IPs 192.168.40.147 (eth0) in 192.168.40.128/27 subnet and 192.168.40.165 (eth1) in 192.168.40.160/27 subnet. Now we ...
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80 views

Can we use ICMP redirect message to pass routing information among interior routers in an autonomous system ?

Can we use ICMP redirect message to pass routing information among interior routers in an autonomous system ? why or why not? I know that routers send out ICMP redirect message if they find a better ...
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33 views

Remote domain clients use remote gateway instead of local gateway

I've a remote office, connected via VPN LANtoLAN to the main office where is located a server with 2003 SBS. In the remote office there is a dozen of clients not joined to the domain, that use local ...
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171 views

Connecting a Linux client to an IPSec VPN (Vyatta)

I have just setup an IPSec on a Vyatta server and now I am trying to connect a Linux client to this router. What I basically am trying to do is to be able to make that Vyatta machine a physically ...
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247 views

Suddenly cannot reach (ping) remote server on a remote site

We have 2 sites linked together with VPN tunnel (Fortigate 60C devices). On each site I have ESXi server with a couple of VMs. Normally, everything works fine. Site 1 (S1) subnet is ...
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82 views

Best way to setup linux gateway and KVM bridge

Ok so I have a Linux gateway host that acts as routing/file server, two NIC's, EXT and INT. Iptables is handling the rules to forward the traffic on a RH based system, as well has having some complex ...
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146 views

Reverse Proxy Performance Issues with JIRA over Local Network

I am running a JIRA and a Confluence server behind a reverse proxy (Apache) and I am having some performance issues. It works perfectly fine when I accessing Jira from an external network (i.e. from ...
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33 views

Cisco 3560G interconnected via trunk link

I have 7 3560g switches connected via a trunked management vlan between them, problem is that I can ping an IP on one switch and it works, but can't ping the same IP on another switch without clearing ...
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80 views

Routing static IPs

This is probably a simple question for you experts. I have a BT infinity business broadband account, that offers 5 static IP addresses. I'm trying to expose a server on one of those addresses. This ...
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15 views

VM not being able to reach external address

I have a VM behind a NAT in ESXi 5.1, which has internal IP 192.168.220.254 and I'm trying (from the VM) to reach its complete external IP, but I get a active connection refused. From my workstation ...
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67 views

linux bridge multiple interfaces

I have Ubuntu box with bridge setup to forward traffic to vlan 10 interface and it works fine. My current setup eth0 | +-----------------+ | | | br0 | | ...
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26 views

Routing SIP client thru WAN router

I may ask again: I have following setup: SIP Client on LAN can make calls, etc thru PBX (is a closed device). I want the same for the remote SIP client. Can I configure all in the WAN router ? May ...
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44 views

tunnel two windows or linux server with routing packets

I would like to use IPIP eoip tunnel for windows/linux. In addition, It's not necessary to be IPIP, I want to route connection from server 1 to server 2. You can see following flowchart: ...
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106 views

Open port and route incoming traffic back to the connected client - OpenVPN

I did my own VPN setup on a CentOS box and it's working very nice and smooth. However I would like to add a feature that I open a specified port on the box for the incoming traffic that should be ...
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110 views

Why NATted packets have different source ip addresses?

I've got ubuntu box with nat. Here is the problem: root@office.redhelper.ru:~# tcpdump -i tap0 host 194.190.8.141 -n tcpdump: verbose output suppressed, use -v or -vv for full protocol decode ...
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60 views

virtual NIC, local routing and linux kernel routing table

from this article: http://backreference.org/2010/03/26/tuntap-interface-tutorial/ the author created a tun interface # openvpn --mktun --dev tun2 # ip link set tun2 up # ip addr add 10.0.0.1/24 dev ...
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367 views

How to enable multicast routing in TMG 2010?

I have a TMG 2010 firewall between some office networks, which handles routing and firewalling; I need to let some application-specific multicast traffic flow between these networks; this is UDP ...
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278 views

Routing issue with KVM: Gateway on different Subnet than VM

I have Server at hetzner.de, with a /29 subnet for running KVM-VMs. The VMs get network access via a bridge interface. I'm currently using two IPs from the subnet. The VM-host is running Ubuntu 12.04 ...
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42 views

Is there a way to diagnose *where* comms to a port on a windows machine is being blocked?

I am developing a system that comprises an email server. I have so far been unable to connect on port 25 (using telnet), despite having checked the following are set up correctly. Connections to port ...