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

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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 ...
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2answers
627 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 ...
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3answers
21k views

Source-based routing on Cisco 3750 switch?

I have this Cisco 3750 switch which handles many VLANs. It has an IP interface on some of them, and it does routing for those computers connected to those VLANs which use the switch's IP addresses as ...
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1answer
6k 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 ...
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1answer
6k views

how do I set static routes in windows domain to all computers at once

Setup, its a test lab and we have some odd requirements Windows 2012 Server running AD/DNS/DHCP 500 client machines used w/4 physical network interfaces each 2 interfaces are test resources, ...
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1answer
65 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 ...
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2answers
13k views

Sonicwall routing between multiple subnets on multiple interfaces

As shown by the network diagram below, I have two completely separate networks. One is being managed by a Sonicwall NSA 220, the other by some other router (the brand is not important). My goal is to ...
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2answers
190 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 ...
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1answer
2k 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 ...
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2answers
1k 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. ...
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2answers
790 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 ...
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4answers
119 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. ...
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1answer
790 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 ...
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5answers
2k 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
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2answers
364 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 ...
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1answer
227 views

OpenVPN routing: multiple default entries. OpenVPN client: iptables. DNS issues

I'm running an OpenVPN-Server (Debian 8) for privacy purposes when using public wifi. Hence, all network traffic of the client is intended to be handled over the VPN connection. The server and client ...
3
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1answer
1k views

MULTI: bad source address from client - any one-off solutions?

Setup: I have the an openvpn client/server setup (config files at bottom), and I get the infamous MULTI: bad source address from client [192.168.x.x], packet dropped message at server. The server has ...
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2answers
1k views

How to Reverse Proxy Raw TCP Packets

I am designing a system where remote devices securely send status updates to a central logging server for aggregation. On the server I am using the Redis + Logstash + Elasticsearch solution. The data ...
3
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1answer
947 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
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1answer
1k views

OpenVPN and one way pings

Network configuration I have set up a network: Appropriate ports of computers in 192.168.87.0/24 are forwarded on TP-LINK router to be seen "all over the world". IP forwarding in enabled on ...
3
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1answer
87 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 ...
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1answer
1k 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 ...
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1answer
879 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 ...
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1answer
266 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
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1answer
848 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, ...
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1answer
5k 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 ...
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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 ...
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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 ...
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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
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1answer
152 views

Routing on Bonded VLANs

I've got a linux d/b server (OEL 6.4 but effectively Redhat 6 I believe) with bonded nics connecting to juniper switches. I've split the bond up into multiple vlans (bond0.11, ... bond0.18) with IP ...
3
votes
1answer
760 views

Internet access from private VPC subnet?

My brain is a little bit fried trying to figure this out but I can't seem to get private subnets to connect to the internet to grab updates for example. Basically all I want is web access for these ...
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1answer
1k views

blocked.domain.gstatic.com - Where could this blocking be?

As of this morning we were having serious issues (partially loaded site with no functionality) accessing Google Drive which we use heavily. Other websites seemed to work fine. This is happening on ALL ...
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1answer
11k views

How do I route all traffic from clients connected to the DD-WRT to its OpenVPN tunnel tun0?

I am setting a secondary (DD-WRT) router to act as a OpenVPN client so that all clients would get VPN access simply by connecting to the router. But seems clients traffic is always routed via the main ...
3
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1answer
3k 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
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3answers
4k 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), ...
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3answers
1k views

How to access devices with static IPs on different subnet than router?

I have a SonicWall TZ100, firmware SonicOS Enhanced 5.8.1.13, with a static subnet of 10.0.6.0/24 on X0. Ports X2-X4 are port shielded to X0. On ports X3 and X4 I have two devices that were moved from ...
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2answers
8k 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
217 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 ...
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1answer
751 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
1k 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
905 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
956 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 ...
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2answers
3k 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
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1answer
3k 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 ...
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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 ...
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3answers
5k 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 ...
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3answers
374 views

ipv6 local connection

So I have an ubuntu 10.04 router that is tunneling ipv6 to hurricane electric. It has perfectly fine ipv6 connectivity. My problem is that I want to have my ubuntu 10.04 machine behind it be able to ...
3
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1answer
2k views

How to route all traffic over site to site VPN tunnel?

I have a site to site VPN configured between our main site (Site A) and a remote site (Site B). Site A is 10.60.0.0/16 Site B is 192.168.99.0/24 The firewall in Site B is a Juniper SSG running ...
3
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2answers
3k views

Routing based on source address in Windows Server 2008 R2

I'm implementing a direct routing load balanced solution using Windows Server 2008 R2 as back-end server. I've configured a loopback interface with the external IP address. This works, I am receiving ...
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5answers
8k views

Is there a command in Cisco IOS to show all routes tagged with a specific tag?

In Cisco IOS, if I have a route-map entry as follows: route-map redistribute deny 10 match tag 65000 100 ! Is there a 'show' command that will give me a list of all routes that will match that ...