Questions tagged [routing]

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

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Redhat / CentOS Static Routing

Looking for some advice, I'm pulling my hair out trying to figure this out! Running Redhat (CentOS) with fairly normal configuration and I've disabled the firewall for now. I have a web server which ...
1 vote
0 answers
317 views

Router OpenVPN client connected, but remote VPN machines not visible

My goal is to connect my Asus RT-68 router to remote VPN network, so LAN computers can access remote ones. Remote OpenVPN server is run on Zentyal Linux distro. My LAN address range is 100.100.0.0/24 ...
1 vote
1 answer
3k views

Routing via sub-interfaces not working?

I'm trying to isolate outbound network traffic to a specific target for metering purposes, so I thought I'd route it via a dedicated IP address. In order to achieve this I have setup a subinterface ...
1 vote
1 answer
143 views

Routed port on BNT 8124 (Blade Networks/IBM switch)

How can I create a routed port on a BNT 8124? I need to create a /30 routed link between the BNT 8124 and a Cisco 4948 I have a port configured with: interface port 22 name "BNT_Routed_Link" exit ...
0 votes
1 answer
111 views

DNS requests from a local server to another local server

I have two servers running in one network. External IP of main server: 1.2.3.4 (domain.com) External IP of secondary server: should not be available directly from outside Main server (dns, mx, www)...
2 votes
3 answers
8k views

How can I prevent OpenVPN from clobbering local route?

I have a local network on 192.168.1.0 with netmask 255.255.255.0. When I connect to a VPN though OpenVPN (as a client), it pushes a route for 192.168.1.0 that clobbers the existing one, making my ...
2 votes
1 answer
3k views

Dnsmasq , redirect all but google.com

My router uses dnsmasq. In my dnsmasq.conf, I write: address=/#/127.0.0.1 in order to resolv any domain to my local server. It works. Now I'd like to make possible to join www.google.com. Any other ...
0 votes
1 answer
175 views

Freebsd 10 install with non standard gateway route

Some service providers offer dedicated/vps nodes with non standard gateways (ie not in the same subnet). For instance : ip add 10.0.1.1/32 with gateway 56.0.1.1 For this purpose some manual steps ...
3 votes
1 answer
2k views

OpenBSD routing: Cannot reach gateway from IF configured to static block

When trying to set up an OpenBSD router I've run into an apparent routing problem. I have a 1U machine with 6 gigabit NICs (em0-em5). My ISP provided me with the following: xx.xx.97.246/28 static ...
0 votes
1 answer
146 views

Forwarding IPs to Switch for NAT

I have a Question. We actually have a Cisco 1812 Router and we're Switching to an ASA 5512-X. The Problem is, the ASA 5512-X only has 6 Ports. The 1812, had 8. All in use. We need to translate 3 ...
0 votes
1 answer
566 views

PPTP with restrictive access to local network for connecting clients

How can I restrict access to my local network for VPN-clients connecting to a VPN-server (PPTPD) located on my network? I would like clients to be able to connect to my linux node running a VPN ...
2 votes
1 answer
309 views

route table issue when I appended option net.ifnames=0 to grub2

I appended two options net.ifnames=0 biosdevname=0 to grub2 because I want to change default network name to old name eth0 on RHEL 7. After that, I edited /etc/sysconfig/network to set default ...
0 votes
1 answer
474 views

Routing set of users/devices through a specific WAN with a Dual WAN router

I have two internet connections and I want certain devices/users to always to go through the specific connection while the others would be able to use either WAN in a typical load balancing setup. The ...
0 votes
1 answer
145 views

Most robust way of forwarding multiple URL via one IP

This is probably subjective but if anyone could suggest a robust solution for the following that would be fantastic. We have potentially multiple URL's in service which are currently 1:1 with Public ...
-1 votes
1 answer
929 views

Cisco Router - How do I host multiple websites with one public IP

I'm having some difficulty configuring my Cisco 4300 Series router to host multiple websites with a single public IP. I have created my access lists, but the techs over there tell me I must have one ...
0 votes
0 answers
161 views

Migrating from Static Routes to BGP:: now TRACERT/PING works but Windows CIFS or HTTP do not

When we switch from a static routed private non-BGP circuit to a BGP private circuit linking two offices, Windows shares and HTTP browsing of internal machines across offices fails with timeouts. ...
0 votes
2 answers
4k views

Iptables forwarding with single interface

Is it possible to use Iptables to forward all traffic going to certain network to given ip address? I have Ubuntu server to act as router in network 192.168.1.0/24. Its IP is 192.168.1.254. (This "...
3 votes
1 answer
1k views

Where can I get fresh routing registry data for IP:ASN and AS lookups?

I'm interested in maintaining a copy of the type of data available at ftp://ftp.arin.net/pub/rr/arin.db however the arin.db file seems to be missing quite a few resources which are available via the ...
1 vote
2 answers
147 views

Live Migration - Switch Infrastructure

We will be deploying into an environment intended for maximum resilience/redundancy and the capability for rapid scalability. Context This environment is: 1 x NAS server with FreeNAS RAID 2 x ...
1 vote
0 answers
664 views

Exim Route based on Email Header

I am currently crafting an Exim Router to manually route all emails to a user's Spam Box that have a certain header in it. The following condition works : condition = ${if match{$h_X-Spam-Status:}{\...
2 votes
0 answers
147 views

Cisco Switch Routing performance monitoring

It is quite a question for me: I have Cisco Catalyst 2960S switch which is nice hardware even despite its age and EOL. I'd like to set it as small router between several networks within a remote ...
0 votes
2 answers
438 views

Create smaller subnets from large subnet

My network is 10.10.0.0/16. I would like to break this up into /24s. My environment: I use /etc/hosts with dnsmasq for DNS and isc-dhcp-server for DHCP on an Ubuntu 14.04 server (gateway, router) ...
0 votes
0 answers
32 views

How to implement user-based routing for a mobile app

Here I have an interesting case I recently knew about. Let's say a small software shop creates mobile and web apps that make requests to a web service. The software is sold to single users and also to ...
0 votes
1 answer
65 views

Reliable UK/EU ICMP Targets for Periodic Routing/Connectivity Tests?

I need to test routing between my United States datacenters and United Kingdom and Mainland Europe ISPs. This is used to distinguish between general transcontinental routing issues and specific ...
0 votes
0 answers
607 views

ASA 5510 Inter-Vlan routing issues

and thank you in advance for your help. I am having an issue where we are migrating from an ASA 5505 to an ASA 5510 and the software versions are quite different as well so they handle VLANs ...
2 votes
1 answer
436 views

Replace client switches with Netgear to match core or instead mix/match Cisco?

We are looking for how we can have a more reliable, simpler network. How can we keep out administrative burden low, and work smarter not harder when it comes to our infrastructure? Background: We ...
1 vote
0 answers
108 views

OpenVPN Tunnel not working for subnets after some time

okay this sounds weird, I have one OpenVPN Server with 2 clients, 1 client works fine, the second one drops out after about 1 day. The server is 10.7.2.1, the client 1 10.7.2.2 (not working) and ...
1 vote
0 answers
1k views

RRAS IKEv2 Behind Router

I have an installation of Server 2012 R2 running that I need to deploy an IKEv2 VPN on. It's my way of accessing files at my office. The current setup involves a NAT Router (Just a standard ISP-...
2 votes
0 answers
1k views

Route single IPv6 address using router advertisement

I have a server in my local network that connects to an external VPN server and gets assigned the public IP address 2a02:c200:1:10:3:0:4315:2. Currently, when other computers in my local network ...
1 vote
1 answer
2k views

multiple default routes with iproutes2

I am very confused by the semantics of ip rules when it comes to the default route. Sometimes, I can have multiple default routes using different gateways: # ip route default via 10.0.0.4 dev eth0 ...
1 vote
2 answers
2k views

Multiple VLANs on a single subnet

I would like to establish the setup shown below. The image is taken from (http://gcharriere.com/blog/?p=620) and explains how to set this up on a brocade device. I would like to use an ubuntu server ...
0 votes
0 answers
261 views

VPC router does not route traffic to CSR

I am trying to configure VPC Gateway Redundancy with Cisco Cloud Services Router (CSR). http://www.cisco.com/c/en/us/td/docs/solutions/Hybrid_Cloud/Intercloud/CSR/AWS/CSRAWS/CSRAWS_4.html client1---...
3 votes
2 answers
12k views

How to Configure Different Gateways for Different VLANs

I have around 10 VLANs, and two different internet gateways. I want traffic on some VLANs to use one gateway, and traffic on other VLANs to use another gateway. (e.g. I wish to route server traffic ...
1 vote
1 answer
8k views

ipsec/strongswan - how to use remote router as local gateway using the route command

Ok, this should be an easy one, but its driving me nuts. Scenario: Site A (San Francisco) Site B (Colombia) Both sites are connected successfully via IPSec (openswan, debian 8): SiteA---------------...
4 votes
3 answers
36k 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 ...
1 vote
0 answers
37 views

Losing connection to devices over the weekend

We have a networking scheme such as: 10.1.0.0/16 10.2.0.0/16 10.3.0.0/16 Each network is associated with a switch. Each switch connects to a layer 3 core switch that also acts as our router. We ...
-1 votes
2 answers
7k views

How to forward ipv4 broadcast packets between 2 computers on 2 different subnets?

I use my linux server as a primitive router. Currently I have it able to use masquerading to talk to the outside world (using a fixed IP), but about a year or two ago, I upgraded the link between my ...
1 vote
1 answer
3k views

Forward specific web requests from Apache server to IIS 7?

I have two servers: an Ubuntu/Apache web server and a Windows 2008 IIS7 server. I have one external static IP address. All web requests on port 80 are forwarded to my Ubuntu machine. The majority ...
1 vote
0 answers
292 views

openvp client "spoofing" server with IPv6

An openvpn client (windows 64 bit -presumable windows 8-) is connecting my OpenVPN server normally. After connecting, it is routing all it's vpn related traffic through the vpn, natting (seems to be ...
0 votes
1 answer
114 views

Load-balance via netfilter

In iptables I can mark some packets(one of four, ie) in preroute and redirect after only marked packets. Is way to load-balance traffic via netfilter tables?
7 votes
3 answers
2k views

How does a router on the Internet know where to send a packet to next to get it towards its destination IP address? [closed]

I've been doing small-time freelance IT work (among other things) for about the last decade now. I've set-up or rebuilt more local network arrangements than I can care to count, and more recently I've ...
0 votes
2 answers
3k views

How can I DNAT a packet coming through a bridge back to its source with iptables? [duplicate]

I have a host1 that has a WAN interface eth0 (1.2.3.4) and a LAN interface eth1 (10.41.82.1). Inside the LAN is a host2 with the IP address 10.41.82.2. Incoming connections to 1.2.3.4:22 are ...
1 vote
0 answers
445 views

Routing Traffic Through from VPN Client to Switch Network

Network Diagram I have two computers, Foo and Bar, connected to an OpenVPN server on Amazon EC2. Both the computers are connected to the Internet via Wi-Fi. The VPN IP addresses are on 13.8.0.*. ...
0 votes
1 answer
998 views

How to route all internet requests to a local pc

I have a friend who works in a small office with ~10 computers + 4 servers. Local service provider told him that there will be a planned maintenance and they will have ~2-3 days of internet downtime. ...
3 votes
1 answer
4k views

OpenVPN server sending bogus default gateway information to client?

Though the VPN client successfully connects to the OpenVPN server, it seems to be setting an incorrect and bogus gateway no matter what permutations of push "redirect-gateway local def1" and/or push "...
2 votes
1 answer
92 views

routing two DCs using VPN

I have two remote servers that have their local LAN connected via a VPN. Some more details including routing tables here https://ghostbin.com/paste/6sv3w 192.168.1.1 is router1 with lan 192.168.1.0/...
0 votes
0 answers
92 views

Debugging a routing issue

So I have a weird temporary configuration that we have in place for a migration to AWS. (retiring some old equipment) I need to pipe web traffic from our current IPs in one datacenter to new ones in ...
0 votes
1 answer
1k views

Assign WAN IP on internal NAT network

I have a static WAN IP address (in the example 77.88.99.166) that is provided by a DSL modem that also has a static IP address (77.88.99.165). The modem interfaces with a firewall/NAT router (green) ...
0 votes
1 answer
124 views

I FUBAR'd the IP, subnet, and VLAN settings. Now how to access managed switch?

I have a Dell powerconnect 2748. I think I have done messed it up though when setting it up because so far I have not been able to access the webconfig of the switch after I changed some settings I ...
32 votes
2 answers
4k views

Does adjusting a domain name's TTL actually matter?

I'm aware that tomorrow the public IP address of one of our production servers is going to be changed. The TTL on that A record is currently set to 3 hours. Will adjusting the TTL on that A record ...

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