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

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2answers
263 views

Multiple IPv6 routers in a local network

I'm setting up some servers that will run virtual machines using IPv6. The network topology is something like this, where the br0 interfaces are virtual: 2001:db8:fedc:aaaa::/64 ...
3
votes
4answers
2k views

Failover routing between 2 gateways

I have 2 routers in a cabinet and would like to setup fail over between the two for our servers sort of like BGP but not BGP :). I need to setup the system to realize gateway 1 is (down) or under ...
3
votes
1answer
1k views

Setting up linux routing

The system I'm trying to set up has an IP address 172.31.2.1. Its default gateway is 172.31.254.1. This works fine, and I can reach anything the gateway allows me to go to (172.31.0.0/16 + ...
3
votes
4answers
14k views

Routing and remote access VPN setup

I am trying to set up VPN using routing and remote access. I've tried two configurations, one using a single network card, and one using two network cards. I can connect through my VPN and get ...
3
votes
1answer
2k views

pfSense router on a LAN with two gateways

I have a LAN with an ADSL modem/router on it. We have just gained an alternative high-speed internet connection at our location, and I want to connect the LAN to it, eventually dropping the ADSL. ...
3
votes
2answers
928 views

View Infiniband routing table generated by OpenSM?

As I understand it, the subnet manager of an Infiniband network calculates the best routes between each pair of nodes on the network and provides these routes to the nodes when they want to ...
3
votes
4answers
253 views

Add a server between router and switch (production)

I have a small office network basically like below, there are more router/pc connected in S1. As you can see, the router is doing job of DHCP, DNS. but now I wish to add a Linux server between R1 and ...
3
votes
3answers
482 views

2 BGP Upstreams, One sending default route, another Full Table

We have 2 upstreams ISP A and ISP B. ISP A (10Mb/s) is our main upstream with good bandwidth. It sends us default route over bgp. ISP B (2Mb/s) is our backup upstream with a small bandwidth, but it ...
3
votes
2answers
4k views

How does F5 GTM work?

The F5 GTMs automatically reroute users to one of the available datacenters should one fail. How does it do this? For instance the F5 could act as a DNS server and simply serve a different IP to ...
3
votes
1answer
2k views

How can the route between two private IPs go via public IPs?

I'm trying to understand what this output from traceroute means. I changed the IP addresses for privacy but retained the public/private IP range distinction. traceroute.db -e -n 10.1.1.9 traceroute ...
3
votes
2answers
210 views

Outbound IPv6 Trafic Fails

My hosting provider has supplied me with global static IPv6 for my machine. It appears that auto configuration has been successful and I can successfully ping my machine and tracepath6 appears to ...
3
votes
2answers
2k views

Is it possible to use proxy-arp back to the same interface?

I have a WiFi Access Point connected to a Linux Router. The Router is itself connected to the Internet. For multiple reasons (mostly to control security and quality of service), I want to force all ...
3
votes
1answer
5k views

Ubuntu Karmic: purpose of route table entry for 'link-local'?

I'm wondering what is the purpose of a routing table entry named 'link-local'. root# route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface ...
3
votes
1answer
73 views

Massive packet duplication

Short Version: We've had a problem with a particular server receiving massive duplicates of packets. After much fault finding we found the problem was caused by a switch sending my packet out every ...
3
votes
1answer
516 views

Rotating outgoing IPs using iptables

I am trying to rotate outgoing IPs using iptables. I want to rotate outgoing connections between three IPs, one by one. Here is what I'm doing with iptables: root@server:~# iptables -t nat -I ...
3
votes
1answer
61 views

Routing table configuration

Suppose having an routing table in which the default-route is missing can a router work without a default-route or the table is incomplete? and having these two entries is also legit or there is an ...
3
votes
2answers
135 views

Preventing endless forwarding with two routers

The network in quesiton looks basically like this: /----Inet1 / H1---[111.0/24]---GW1---[99.0/24] \----GW2-----Inet2 Device ...
3
votes
1answer
1k views

Routes bound to virtual interfaces, Debian, and how to determine specifics, after the fact

I've recently begun a new job, and have inherited an existing infrastructure with a lot of issues. One of the issues is that the previous admin added static routes to some servers, bound to virtual ...
3
votes
3answers
2k views

linux vlan routing

I've got this network topology: network 192.168.100.0/24 vlan 100 network 192.168.200.0/24 vlan 200 one ubuntu server(2 vlans on 1 ether) eth0.100 (ip:192.168.100.10/24) eth0.200 (ip: ...
3
votes
2answers
832 views

SSTP on Windows 2008 cannot ping in either direction

I have the following setting going on. Server: Configured windows 2008 server as AD, DHCP, DNS, CA and RRAS. To make long story short, RRAS can accept SSTP connection and clients get connected fine. ...
3
votes
2answers
557 views

Prevent a single host from consuming entire bandwidth?

We have a linux router providing internet connectivity to several PCs. It's currently using shorewall to help make the iptables setup easier. Is there a way I can set it such that any individual host ...
3
votes
4answers
112 views

Only able to use the first IP in a range from ISP

Right now I have a subnet of 16 IPs. I want all of the ips to be "owned " by my firewall. I have a watchguard firewall statically configured with X.X.X.225 and has X.X.X.226 - 238 as Secondary IPs. ...
3
votes
1answer
685 views

Difference between “traceroute” and “traceroute -U”

The manpage of traceroute says that the "-U" parameter (UDP probing) is the default, but I'm getting different results every time. With "-U": traceroute -U www.univ-paris1.fr traceroute to ...
3
votes
5answers
1k views

Do I need a VPN to secure communication over a T1 line?

I have a dedicated T1 line that runs between my office and my data center. Both ends have public IP addresses. On both ends, we have AdTran T1 routers which connect to SonicWall firewalls. The ...
3
votes
2answers
348 views

IP Forwarding and traffic shaping

Is there any way to forward packets from network A to network B (just like a router) without changing source IP Address (and vice versa, from network B to network A) and also enforcing traffic shaping ...
3
votes
3answers
2k views

two gateways / two providers with different ips

I want to route packets coming in on eth0 back over eth0 and the ones coming in to eth1 back over eth1. I don't care which gateway is used for outgoing connections. If i just enter two gateways in ...
3
votes
1answer
466 views

Domain Based Port Forwarding with VLAN routing [closed]

At my new workspace I want to setup a network that enables me to deploy my web development work on Dev, Test and Accept servers (VMs) with (controlled) access from outside the network - based on ...
3
votes
1answer
83 views

How can I tell if a host is bridged and acting as a router

I would like to scan my DMZ for hosts that are bridged between subnets and have routing enabled. Since I have everything from VMWare servers, to load balancers on the DMZ I'm unsure if every host is ...
3
votes
1answer
820 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 ...
3
votes
1answer
647 views

Can I set up two NICs bridged together and still SSH into the bridging machine?

I have a ubuntu box setup with two NICs. I can bridge them together just fine, but I haven't been able to setup a way to SSH into the box once the connections are bridged together. Here's my ...
3
votes
1answer
209 views

one way routing

I have two computers connected with VPN, and some virtual machines on each. I want everything to see each other (that is basically 4 different networked machines). What I've not managed so far is that ...
3
votes
1answer
552 views

Site to site VPN : how does the routing work?

I've established a site to site VPN with two Zyxell routers. Site A (LAN: 192.168.16.x) is the main office, and site B (LAN: 192.168.17.x) is a branch office. Both sites are able to reach each other, ...
3
votes
1answer
3k views

how to secure an vmware esxi host on a root server?

for me, a vmware machine normally has 2 lan interfaces, one connected with the lan or the management computer and the 2nd one connected with the wan interface for public access. so security is ...
3
votes
1answer
3k views

OpenVPN redirect-gateway does not work on Windows 7?

i have set up openvpn, and it works. pinging from client to server and backwards works just fine. but now i wanted to redirect all the clients traffic through the vpn. so i did the following steps as ...
3
votes
2answers
2k views

Linux IPTables Destination NAT with Asymmetrical Routing?

What is the proper way to handle DNAT when traffic leaves a different interface than it arrived on? When this happens it seems the reply doesn't have the source address replaced automatically as it ...
3
votes
3answers
2k views

udp through nat

I've two private networks (each of them behind a typical dsl router). The routers are connected to the WWW. The extern interface of each router have one dynamic IP address. I want to stream data via ...
3
votes
6answers
2k views

How to access a webserver on external network from local network?

I'm trying to make it possible to access a webserver on another network (A) from my local network (C). They have a router on our end which I cannot access directly to make any changes, If I ...
3
votes
1answer
761 views

iptables: access connected openvpn client from the LAN with the VPN server

I have what is essentially a routing problem, and I'm not familiar enough with routing and iptables to effectively troubleshoot and set up my network needs. What's working I have an openVPN network ...
3
votes
3answers
1k views

Almost working: How to set up iptables and iproute2 rules on dual WAN linux server?

I have a Raspberry Pi (running Raspbian) with three network interfaces (one ethernet and two USB wifi nics). What I want to achieve is this: I have two WAN connections to the internet (DSL + Cable), ...
3
votes
2answers
4k views

How to route between 2 networks with a server with 2 network cards?

This is the first time I am faced with routing and it seems I have hit a dead end. I have the following scenario: client1: 192.168.1.10 255.255.255.0 gateway: 192.168.1.100 DNS server: ...
3
votes
1answer
142 views

Connection Drop with Load Balancing over Multiple Uplinks

I have a Server with to uplinks into the Internet. I'm doing load balancing over both uplinks with ip utility from the iproute2 package. ~ # ip route show [...] default nexthop via 217.0.117.212 ...
3
votes
1answer
532 views

selective routing through a VPN tunnel

The problem: after establishing an IPsec VPN tunnel all traffic is routed to the remote endpoint, while I only need to route the packets destined to that internal network and still be able to access ...
3
votes
1answer
843 views

No TCP connections to hosts behind VPN server (SYN, SYN-ACK, but no ACK), UDP, ICMP works

I'm probably doing something incredibly stupid, but I just can't seem to figure out what. Here's what I'm trying to accomplish: I want remote users to be able to log into our network, so I set up a ...
3
votes
2answers
716 views

Basic networking: Centos Server Router + Ubuntu Client setup.. unable to access outside world from client

I am trying to set up my Centos Server with two NICs as a router. eth0 is connected to the outside world and eth1 is connected to an Ubuntu client. Here's eth0 on the server: DEVICE=eth0 ...
3
votes
1answer
833 views

Configure server to route all traffic through OpenVPN

I have an openvpn setup that is working great. There are some 50 clients connected and everything is handy dandy. I need one of these clients to route all traffic trough the vpn. I setup a ccd for ...
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 ...
3
votes
1answer
2k views

Multiple GRE tunnels on the same host, only one routes incoming packets

I'm having a routing problem on CentOS 6.2 (kernel 2.6.32-220) Here's the setup: One host is on my local network. It's talking to two nearly identical hosts at a remote location. The two remote ...
3
votes
3answers
2k views

How do I get internal hosts to use a VPN connection set up on a FreeBSD router?

Question in short: How do I get traffic from a host on an internal network, using NAT behind a router, to use a VPN connection set up on the router? I have a FreeBSD 9 router with 4 network ...
3
votes
3answers
3k views

IP Phone over VPN - one way calls unless default route?

I have come across a strange problem with our VPN and BCM 50 (Nortel/Avaya) phone system. As you can tell by my other questions I have been doing some work on setting a VPN up from one location to ...
3
votes
1answer
15k views

How do I route between interfaces in PFsense?

I have a PFsense router which divides a single WAN connection into three NAT networks on three interfaces: LAN, OPT1 and OPT2. This allows me to segregate my network so that computers on the OPT1 and ...