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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identify a router that cuts certain port

Is there a way to identify which particular router between me and some server blocks connections on certain port? I am in a hotel in Thailand, where they have recently changed some settings in their ...
Sergiks's user avatar
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Do I need routing protocols on a small network?

I have a small network with 10 VLANs, mostly routed via our core layer 3 switch. RIP is enabled on the core switch, but I'm in the process of adding a second router for a couple of VLANs as our core ...
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Why does ifconfig reset the default gateway route?

In FreeBSD, an ifconfig call seems to delete the default gateway route, even when given the same IP-address (e.g. when updating the netmask only). Is it a bug or a feature? As fas as I remember Linux ...
Eugene Yarmash's user avatar
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Ubuntu defaults to IPv6, should default to IPv4

Ubuntu 16.04.5 with kernel 4.4 used to work as intended: IPv4 is default. Since changing to kernel (hwe) 4.15, it uses IPv6 as default. It has IPv6 available via Tunnelbroker, broadcasted by the ...
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How to get public IPs on ESXi VMs?

We have a dedicated server with a hosting provider. We are running ESXi 6.0. The server has a single public IP which is currently being used for the management interface. The provider has also ...
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Why is Linux choosing the wrong source ip address

and what to do to let it choose the right one? This all happens inside an OpenVZ container: The Host is Debian/Wheezy with Redhat/OpenVZ Kernel: root@mycl2:~# uname -a Linux mycl2 2.6.32-openvz-...
Scheintod's user avatar
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Simple Multihomed Linux Server Issue

I have a Linux server running CentOS 6.4 that is used as an iSCSI target. The server is multi-homed with two NICs, both on the same subnet. iSCSI multipathing takes care of the load-balancing/failover,...
tfrederick74656's user avatar
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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, ...
Greg Mason's user avatar
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Jumbo frames with wireless client

I currently have the following network configuration Apple Time Capsule (Gigabit Ethernet router) 2 Windows desktop wired with Gigabit ethernet 1 MacBook Pro in wireless N mode 1 iPhone (obviously ...
Fabio's user avatar
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Dead gateway detection on linux

I have to setup dead gateway detection on a linux box with three network interfaces. The only guides I have found so far on the topic imply patching the kernel, which we are not very keen to do. Is ...
Figo's user avatar
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OpenVZ multiple networks on CTs

I have Hardware Node (HN) which has 2 physical interfaces (eth0, eth1). I'm playing with OpenVZ and want to let my containers (CTs) have access to both of those interfaces. I'm using basic ...
user6733's user avatar
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AWS: Error accessing the Internet with a custom Network ACL

I've been stuck looking at my screen for about 2 hours trying to figure out why this is not working. I'm building the typical VPC with a private and public subnet and trying to lock it down as much as ...
Augusto's user avatar
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How to make connections answer from the same gateway they entered in RouterOS?

I have a MikroTik RouterOS 6.23 device, and my network is as follows: Router | |-- bridge1_LAN (wlan1 + ether1) (192.168.0.210) -- LAN (192.168.0.0/24) | Here is where computers are. Those ...
Yajo's user avatar
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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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How to set a static route for an external IP address

I'm putting a new router on our network to help manage our private network connections and to better control routing to the outside. I've decided to simplify this question by removing references to a ...
HorusKol's user avatar
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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 ...
anastrophe's user avatar
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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 ...
Gilles 'SO- stop being evil''s user avatar
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Forward differing hostnames to different internal IPs through NAT router

I have one public IP address, one router and multiple servers behind the router. I would like to forward differing domains (All using HTTP) through the router to different servers. For example: ...
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How do I add a multicast route in Windows 7?

I have 2 interfaces on my desktop: one in a multicast enabled vlan, that has access to some udp streams, but otherwise unrouted, and one with internet access, but no multicast. If only the multicast ...
evilpenguin's user avatar
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How to forward host ports of < 1024 to a VirtualBox NAT-connected machine?

The manual says: "Forwarding host ports < 1024 impossible: On Unix-based hosts (e.g. Linux, Solaris, Mac OS X) it is not possible to bind to ports below 1024 from applications that are not run by ...
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Network Drive attached as SCSI Dropping the W/R speed on bigger files

I'm having Network disk attached a SCSI disk When copying smaller files like 700MB or even 1 GB, speed is high , from 90MB/s to 120 MB, so I'm capable to benefit from 1Gbit network. But if files is ...
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iptables packet forwarding to one of two gateways depending on origin

Given the following installation: old router 192.168.1.1 with NAT forward of tcp port 80 to 192.168.1.10:80 new router 192.168.1.2 with NAT forward of tcp port 80 to 192.168.1.10:80 web ...
Daniel Alder's user avatar
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New KVM guests cannot access outside LAN

I have a KVM host (at 192.168.0.10) that currently has one working KVM guest (at 192.168.0.12). On attempting to install a new KVM guest today, I reached a problem where the network on the new guest ...
Chris's user avatar
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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 ...
BBK's user avatar
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IPv6 Neighbor Discovery/Routing Failing for Kernel 3.10

Stupid mistakes led to all of this, read Update 5 Intro I'm trying to setup a Linux Router (LXC, 3.10.0-123.el7.x86_64) with IPv6. The provider is Hetzner and I got 2 subnets, one /56 and a /64. They ...
Thomas Rosenstein's user avatar
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Specifying Gateway for VPN Connection

I'm not very familiar with networking really, so go easy on me! I need help enabling Split Tunnelling for client connections to my newly created VPN server. I've un-ticked the Use Default Gateway on ...
Danwise's user avatar
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Router advertisement for ipv6 is advertising link-local adress

I have the following situation: I configured a FreeBSD 9.1 machine as the endpoint of a heartbeat SixXS tunnel on a gif0 interface. It works so far, and I can ping6 via IPv6. I assigned to another ...
GorillaPatch's user avatar
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"route add default -iface em1" in rc.conf on FreeBSD

I have two NICs on my FreeBSD server, which are set up like this in rc.conf: ifconfig_em0="10.0.0.1 netmask 255.255.255.0" # LAN NIC ifconfig_em1="DHCP" #...
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Policy based routing

I found very good article on load balancing at http://www.diegolima.org/wordpress/?p=36.. I could not implement it though as my requirement is slightly different from pure load balancing. We have two ...
Silkograph's user avatar
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RedHat 7: SIOCDELRT: No such process

[user@telco-aa1]# route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface default gateway 0.0.0.0 UG 100 0 0 ...
Brian Harkness's user avatar
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openvpn: How to not use VPN for domains with multiple IP addresses

I want to route around openvpn for a specific domain. I have tried: allow-pull-fqdn route specificdomain.com 255.255.255.255 net_gateway But this simply does a DNS lookup of the domain and adds ...
David Ljung Madison Stellar's user avatar
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Make LXC containers directly accessable with ipv6

First off I have a special IPv6 address allocated to my dedicated server, just 1. A ::1/128 one. But I can assign addresses to eth0 (eg ::2/128, ::3/128, etc). Now I would like to run LXC containers ...
harm's user avatar
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Possible to have DHCP hand out different DNS server address when using different tunnel?

We have several ASA 5505 deployed. Currently, we have a setup where the local ASA is answering DHCP queries and is configuring clients with two DNS servers: our DR site DNS server (we use AD) and a ...
brandeded's user avatar
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Choosing nearest Server across the globe?

i want 3 dedicated servers: in USA, Europe and China. They all run exactly same website. I want to setup them so, that particular user will automatically talk to the nearest in network sense instance ...
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4 answers
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Dynamic subdomain routing

I asked this question over at stackoverflow, but got very few views: https://stackoverflow.com/questions/2284917/route-web-requests-to-different-servers-based-on-subdomain Perhaps it's more ...
Nader's user avatar
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How do I tell OS X's implementation of Bonjour/ZeroConf which network to use for mdns?

I have four networks on my machine: 192.168.20.0/24 wired (connected only at work) 192.168.20.0/24 wireless (connected only at home) 192.168.132.0/24 VMWare's NAT 192.168.238.0/24 VMWare's host-only ...
Chas. Owens's user avatar
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Access services via Cloud VPN from Kubernetes container

I have a VPC network set-up with a VPN connecting to the on-prem network. Cloud router is used to create routes (BGP) internally and with the VPN network. One of the projects is hosting public ...
PsychoX's user avatar
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Routing traffic to two NICs on the same network

I have a few linux test boxes on Scaleway, each having 2x NICs that are all connected to the same network 10.0.0.0/8 but each has its own gateway. I want to be able to use both NICs (eth0/eth1) and ...
Vad1mo's user avatar
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1 answer
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Load balancing network traffic using iptables

I am trying to load balance traffic from internal LAN on a linux router having two gateways. Initially I went for the iproute implementation which didnt balance the load as expected, reason being that ...
Bhavya's user avatar
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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 ...
Peter Lieber's user avatar
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Are Link-Local routes necessary (IPv4)?

I noticed in my routes output in RHEL6 (and most 2.6.x series Linux), for every interface I see the creation of the following route in my kernel routing table: 169.254.0.0 0.0.0.0 255.255....
slugman's user avatar
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OpenVPN server cannot ping client IPs

I have flashed a router at two separate sites with DD-WRT firmware and setup OpenVPN on both. once connected the client can ping computers on the servers LAN however the server cannot ping IPs on the ...
Maurycy_was_userxxxxxx's user avatar
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1 answer
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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 ...
Josh's user avatar
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Windows Server 2008 R2 RAS VPN: access server on internal interface ip

short question: I'm usually a linux admin but need to setup a Win2k8 R2 server for a student project. The server is running as VM on a root server and has a public internet IP assigned. Additionally I ...
maff's user avatar
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What is the purpose of TPROXY, how should you use it and what happens internally?

After reading a bit about TPROXY (e.g at https://www.kernel.org/doc/html/latest/networking/tproxy.html ) I now have more questions then answers. I actually don't even know what TPROXY should do... ...
Garo's user avatar
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Linux machine unable to send IPv6 packets for five minutes about once per day [closed]

I am operating a router based on a Linux server running Debian stable (Buster). It uses Quagga to speak BGP4 to four peers (one of which sends the entire Internet routing table for IPv4 and IPv6, the ...
ftc's user avatar
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How long is an (accepted) ICMP redirect observed for, and how can I shorten that time?

If a Linux host receives and accepts an ICMP redirect (accept_redirects=1 on the interface in question), how long is this route being cached for and observed? Can I lower that time? I am asking ...
Nils Toedtmann's user avatar
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2 answers
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Incoming packets don't hit iptables INPUT chain

I'm running a VPN client in a docker container. I'm trying to connect from the host to a web server running in the docker container over port 8080. When I try to connect, I see my incoming packet on ...
user875729's user avatar
5 votes
1 answer
421 views

Overcome asymmetric routing while migrating between sets of ISPs

We are migrating from one set of addresses to another set, both /24, and trying to minimize any down time during the migration. Ideally we'd run both for a period of time as we shut down the old ...
fullstop's user avatar
5 votes
2 answers
583 views

timing issue after route add/delete (route not used)

I have an application that is running a raw IP socket, destination of this socket is governed by routes installed via the 'ip route add' command. These routes can change during the lifetime of a ...
KillianDS's user avatar
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