1
vote
0answers
21 views

Can I route traffic destined for a local interface out another interface?

I'm trying to set up a testbench for a transparent device (called TD from now on). The goal is to make sure it forwards and logs correctly. I need to use just 1 machine + the TD in the test bench. ...
0
votes
0answers
30 views

Pinging to google.com from a particular interface

I am connected to the internet via wlan0(wifi) and also have an ethernet port(not connected to the internet). I am looking for some iptables rule / route addition, which will let me do a ping via eth1 ...
1
vote
0answers
25 views

Will iBGP fix this routing scenario?

I have to firewalls running for a cloud service in a data centre providing HA internet for currently around 40 machines. Each machine is a Linux based router and has it's own 10Gbit feed from ...
1
vote
2answers
80 views

Routing Internet traffic through computer on another subnet

Ubuntu box server has 2 network interfaces: eth0 50.57.71.100 eth1 10.182.161.100 Ubuntu box client has 1 network interface: eth0 10.177.30.100 server and client can already talk to each other ...
0
votes
0answers
24 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 ...
-2
votes
1answer
37 views

networking - Dedicated NIC for different traffic

I have two servers which acts as a reverse proxy which accept incoming requests from internet and passes on to application servers, then responses from the application servers are then served to the ...
0
votes
0answers
48 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 ...
1
vote
1answer
78 views

Prevent Linux from processing incoming ICMP Host unreachable packets

I have a test setup with one host on a network (10.1.0.0/16) talking via TCP to another one on another network (10.2.0.0/16) and a gateway in the middle. Sometimes, the TCP connection is lost and ...
0
votes
2answers
71 views

Linux VM's connectivity dies when second network interface is brought up

I'm in the middle of doing some testing on a mobile device, and want to test it from the network. The mobile device will only connect to networks via WiFi, and doesn't support ad-hoc mode, so I've set ...
0
votes
1answer
30 views

Forwarding local network interface on my server through NAT

I have 3 interfaces on my server, first is used for the local network, second and third are internet connections (each has its own ip routing table). How can i force server daemons and command ...
0
votes
1answer
79 views

Linux Firewall & sharing files between computers in different subnets connected to single switch

EDIT : I've edited the question & the title to bring more clarity hoping that someone will be able to point me in the right direction. ************************* * Internet ...
-1
votes
1answer
31 views

GRE tunnel / Route traffic based on which domain the user is trying to access

Imagine this kind of setup. 5 servers. 1 server will be the "front-end", all the traffic has to go through it first before going to the 4 other servers. I don't want people to know the IPs of the ...
1
vote
0answers
60 views

Linux as gateway with VLANs failing for local network

We have a private VLAN being routed out from a host connected both to it and to our public network. Hosts on the private VLAN have the private IP address of the gateway host (10.2.2.82) set as their ...
2
votes
2answers
188 views

Redundant Iptables Routers - secondary router logging martian packet errors

We have a network mostly set up with a redundant pair of Linux Iptables firewalls/routers, but we're missing a crucial piece of the puzzle. Any local traffic destined to the secondary router succeeds ...
0
votes
2answers
170 views

How to set a custom route source in openvpn

I have a simple openvpn configuration. remote 1.2.3.4 dev tun ifconfig 10.74.1.13 10.75.2.1 secret static.key route 10.75.0.0 255.255.0.0 keepalive 10 60 When the link come up, the routing table is ...
0
votes
0answers
23 views

Connecting to VPN and internal routing

I have an openvpn access server setup running centos. I've allowed all my private subnets access to vpn clients, as well. A lot of people connect to the vpn on the internal network as well, which is ...
0
votes
0answers
217 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 ...
0
votes
1answer
47 views

failure discovery using LLDP

I have a array of switches connected to an Openflow controller.I want to understand the topology of the switches.I am thinking of using LLDP for this.Now in this architecture if a link goes down or a ...
0
votes
2answers
32 views

Prevent internet access except for one server?

I want to see if the HTTP proxy support for an application is working correctly. In order to check this I have installed a Ubuntu VirtualBox on my Mac laptop and I want to configure the virtual ...
0
votes
0answers
71 views

Route traffic through internal (VDE) bridge

I have two NICs configured, let's say eth0 with IP 10.0.0.1/24 and eth1 with IP 192.168.1.1/24. IP forwarding is enabled, rp_filter is disabled. I've created 2 tap interfaces and bridged them with: ...
0
votes
1answer
93 views

Interface ip address discrepancy

This is very strange. Output of ip route show: default via 192.168.1.1 dev eth0 metric 100 192.168.1.0/24 dev eth1 proto kernel scope link src 192.168.1.10 192.168.1.0/24 dev eth2 proto kernel scope ...
1
vote
1answer
100 views

Ubuntu Second Wan Interface Card

I configured 3 network card. one of them is LAN card and others are Wan network card. eth0 Link encap:Ethernet HWaddr 00:50:56:00:30:da inet addr:5.x.x.1 Bcast:5.x.x.3 ...
1
vote
1answer
79 views

Why can't I reach the LAN side of a slave vrrp router?

I have a dual linux firewall/router setup that is connected to 2 different upstream providers. Internally the default route is a failover using vrrp. The setup looks something like this. The routes ...
4
votes
1answer
189 views

ping request not forwarded in one direction

Edit: I solved my issue just as I was finishing this insanely long post. I had simply not enable ping reply in my windows firewall which is why I could not ping a computer on network 0 from network 1 ...
1
vote
1answer
120 views

Route Traffic Through Linux Server With Two Devices

Here is my current setup (all servers are Ubuntu Server Edition 12.04): Server 0 has two devices, eth0 and eth1. eth0 is connected to the wall (the internet), and eth1 is connected to a switch. ...
6
votes
1answer
9k views

What CAN cause 'RTNETLINK answers : No such process' when adding a route

I have come up against this error a number of times, but haven't yet found an explanation of what the error means, or what can cause the problem. I'm not posting my configs or the specific route I'm ...
0
votes
1answer
84 views

Routing via Linux

I have an individual network with a single machine having IP Address 10.10.10.4. Another machine (Gateway Machine) has two NICs: eth0 and eth1. eth1 (10.10.10.10) is connected to the internal network ...
0
votes
2answers
813 views

Hosting websites on a public ip routed via a private subnet using one Linux machine as both router and server

I use Ubuntu server as router, NATing router and webserver. The server is connected to ISP with a public /29 subnet. Also I host some important websites on it. I asked the ISP to provide ipv6 address ...
3
votes
1answer
695 views

Configure IPv6 routing

I've got IPv6 addresses from SIXXS. My host is connected with SIXXS network over a AICCU tunnel ("sixxs" interface). My host address is 2001:::2, the host on the end has address 2001:::1. On my host ...
1
vote
4answers
300 views

Route web browsing through a separate iterface

I'd like to route web browsing through the wlan0 interface and the rest through eth1. Can you please help me with the iptables commands to achieve this. Below is my configuration. Thank you :) Edit: ...
2
votes
2answers
1k views

Ubuntu Ignoring packets from network A on eth0 when eth4 configured on network A

I have an Ubuntu 12.04 (final beta, up-to-date) server with two configured network interfaces: root@mac:/home/sysadm# ifconfig eth0 Link encap:Ethernet HWaddr 00:1e:4f:28:fd:7b inet ...
3
votes
2answers
1k views

Delete specific conntrack entries?

in a multi-ISP configuration, I'm routing and NATing specific traffic, e.g. VoIP, through specific interface - to a distinct provider. When one of the interfaces (or routes) becomes unavailable, all ...
1
vote
1answer
268 views

IPv6 MTU and MSS ignored in LAN?

I have a server with a (sixxs) IPv6 tunnel and a local network behind it. The tunnel has MTU of 1470, and a prefix with this MTU is advertised by radvd, and picked up by the local client: ...
0
votes
1answer
54 views

Need some explanations on iptables appended rules

Here are some rules that I append to filter table, and I list the added output related to each one: $iptables -A INPUT -i eth0 -j ACCEPT and the output is: target prot opt source ...
1
vote
1answer
214 views

Server behind DMZ firewall won't respond

I have a DMZ server set up to forward specific ports to a couple of machines. The intended behavior is for me to send a request to the DMZ on a specific port, and have the machine that's inaccessible ...
0
votes
3answers
479 views

Linux routing with gateway in different VLAN

On a hosted environment where we do not have control over the routers all we have is a internal network and a DMZ network and a host in each. In the DMZ is a RHEL server running Openswan and ...
0
votes
1answer
7k views

How to route network traffic of a host via another host?

I'm not the System Administrator of our corporate network, but I've got two Linux workstations (hosts A and B) with root access to both. Both hosts can see each other fine (ssh, ping, etc works from ...
5
votes
1answer
334 views

IPv6 and NAT, routing to multiple ISPs

Currently I have a nice setup using private IPv4 address space and uplinks from two ISPs to the Internet. Thanks to NAT I can just take down one of the interfaces and the Internet access is still ...
0
votes
1answer
741 views

How to Route Internal Traffic on a 2nd NIC without a Default Gateway

The actual deployment of this will happen with a larger number of servers, but for purposes of simplicity, let's assume the following is my future setup (I need +4 reputation to embed images, so ...
1
vote
1answer
97 views

Not sure how to handle routing with 2 NICs on 2 different subnets

We currently have 11 Dell PowerEdge servers running CentOS 5.6 in a cabinet at a colo facility. Our colo provider recently informed us that they want to move us to a new VLAN, and give us all new IPs ...
1
vote
1answer
1k views

OSPF: how to advertise the subnet of an OpenVPN server?

I have successfully configured OSPF on all of our HP ProCurve 7102 routers, and most of our internal Linux routers. Routes get advertised, and all is peachy. Except for the routes into the subnets ...
3
votes
2answers
258 views

Traffic not routing as expected

In the following output, why does vpn1 route/ping to 10.100.0.1 instead of to 10.100.0.112? 10.100.0.1 is network gateway with no nat. 10.100.0.112 is dual home host with nat enabled. root@vpn1:~# ...
1
vote
3answers
337 views

using bgp without owning ASN

Is it possible to use BGP to announce serving IP addresses without owning an AS number? Aim is to adding another WAN provider and increase redundancy with the ability to announce IP addreess from to ...
0
votes
1answer
821 views

Trixbox CentOS Default GW Problem (Multi-homed server)

I'm having an issue with a CentOS trixbox server which is dual-homed (one private facing NIC [eth1], one internet-facing NIC [eth0]). I can't seem to get the default gateway to set properly to our ...
0
votes
2answers
1k views

How to route broadcast packets from machine with two network interfaces on same subnet

I run RHEL 5 and have two NICs on one machine connected to the same subnet: eth0 192.168.100.10 eth1 192.168.100.11 My application needs to receive and transmit UDP packets (both unicast ...
0
votes
2answers
2k views

Get linux to change default route if one path goes down?

I'm configuring a gateway/router linux box. It is performing masquerading/NAT. The primary Internet interface is a 3G modem, but if that goes down, I would like it to try a different interface ...
0
votes
1answer
2k views

How to configure linux routing to send packets out through the same interface they were received on?

I have the following routing table 10.0.1.0/24 dev eth0 proto kernel scope link src 10.0.1.151 10.0.10.0/24 dev eth1 proto kernel scope link src 10.0.10.151 default via 10.0.1.1 dev eth0 I ...
1
vote
1answer
1k views

Virtualbox - routing subnet to bridge adapters

I have set up a Debian Lenny box with 3 vbox Lenny machines running eth0 of the host in bridged mode (on virtualbox 3.1.6). When testing in my local LAN, this all worked perfectly well and traffic ...
2
votes
2answers
194 views

“Symbolic link” for NICs under Linux?

Currently on my Linux server I've enabled bridging so that I can use OpenVPN in bridged mode. Works great. eth0 is connected to the LAN; tun0 is the OpenVPN gateway; these are bridged to a new ...