Questions tagged [multi-homed]

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Windows clients with multihomed NICs: can one setup different firewall policies per address?

We have a scenario in which we have a number of Windows 10 clients, that should connect to a 2nd network (different gateway/subnet etc) which resides outside our security perimeter. This, in order to ...
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1answer
58 views

Multi-homing: do i need Route metrics for 2 interfaces of which only one can access the internet?

I have 2 multi-homed servers which, besides each being connected to the Internet via one of their NICs, they are also connected back-to-back to each other via their 2nd NIC. I use systemd-networkd to ...
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35 views

Linux network configuration: multihomed server + monohomed one

I have an issue that i'm sure it comes from Linux configuration. Here is the little infra (it is setup on Azure): I want to be able to ping 192.168.2.21 from 192.168.4.10, but i never received the ...
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1answer
40 views

nginx and wordpress - site2.com need to load content of of site1.com/site2 without url change

I have 1st domain name site1.com - self-hosted wordpress and contains posts and pages. (everything good, no issue at all) I have 2nd domain name site2.com - nothing hosted (dns pointing to same server ...
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2answers
586 views

Sharing same IP across two NICs, to route one IP over dedicated NIC

I have a few hosts connected to the same switch, which are all on the same subnet (10.0.0.0/16). Two of these hosts have faster network interfaces so I have connected them together, meaning these two ...
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0answers
1k views

Windows 10 uses wrong NIC to reach certain IP addresses

I have two servers running Windows 10 Enterprise 2016 LTSB that seem to be using the wrong NICs. The network consists of 2 subnets. So each server has one NIC on the "main" network with Internet ...
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0answers
48 views

Secondary IP dropping traffic

I'm running Ubuntu 18.04 with two interfaces on separate vlans. I'm running a web server which is listening on both interfaces. From each of the lans I can connect to the web server. One of the ...
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1answer
71 views

Net Use Doesn't Work For Second NIC In Windows 7 Pro Computer

I have an Intel E1G42ET Gigabit ET Dual Port Server Adapter installed in a Windows 7 Pro computer (NOT a Windows Server, just a plain old Windows 7 Pro computer). I have setup a 192.168.1.0 network ...
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2answers
353 views

How do I specify a preferred source address for IPv6 multihome clients?

My ISP provides an IPv6 prefix delegation but with a dynamic prefix. I want a publicly routed static prefix for some local services, so I also have a Hurricane Electric tunnel set up, which means ...
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0answers
356 views

Configure DNS servers on multi-homed EC2 instance running Windows 2016 server

I need help configuring DNS servers for a multi-homed EC2 instance running Windows 2016 server. This instance has 2 network interfaces attached to it, eth0 and eth1. I have setup routing policies to ...
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1answer
128 views

Multihomed Computers - wont communicate on a network

I have two multi-homed servers connected to each other via a private network and also via a public network. I cannot get traffic to go across the private network. The servers only use the public ...
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1answer
904 views

DNS Resolution fails on multihomed server

I have an odd issue with a freshly installed Win2012R2 server (Actually a VM running on VMWare). The server has 2 nics (Both enabled), one on VLAN101 the other on vlan102. The configuration: Nic0 IP ...
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1answer
436 views

troubleshooting default route on multihomed device

I'm trying to setup a multi-homed Debian system so that there is a default route per interface, not just a default route for the system. Its a well known setup, but I can't seem to get it to work and ...
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1answer
2k views

Multi-homed OpenBSD system: Policy based routing vs. mpath default routes

TL;DR Will OpenBSD policy based routing help with a multi-homed server/gateway situation? If so, how do I configure it? Long Form I'm managing an OpenBSD with two ISP links and VPN tunnels to ...
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1answer
74 views

ArchLinux multi home not responding on one interface

I have a bunch of kit in a DC running through Cisco ASAs - this isn't really working out as it relies on us creating, paying and waiting for tickets concerning out network config. I've been and ...
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2answers
67 views

Guide for using multiple consumer grade DSL

Consumer grade DSLs are way cheaper than getting at leased line, so for my building complex I am considering getting a bunch of DSLs instead of a leased line. I feel confident that I am not the first ...
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2answers
147 views

Unix: How to find the name of the ethernet interface through which I'm logged in

We have multihomed servers. And to simplify things, I would like to know the dns of the interface trough which I'm logged in. (e.g. to set PS1 thus it can be used in scp commands) My solution for ...
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1answer
2k views

How do I set up the default route on a Linux router with dual ISP links?

So, here's the situation. I have dual ISP links currently active and working for routing traffic from my network, with a very similar iptables setup to the accepted answer at Load balancing & NAT-...
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1answer
432 views

iptables and CONNMARK on ubuntu 14.04

How to enable connmark in netfilter in ubuntu 14. I see this post but I don't find the good module in Ubuntu 14.04. I use connmark for multiwan. My configuration run perfectly in debian 8. But no ...
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1answer
126 views

openvpn client restarts if default gateway is changed

I am running openvpn client in my system which connects to remote openvpn server via Internet. My system is connected to two networks (multi homed) wlan0 and ppp0. Both provides internet connectivity ...
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2answers
514 views

Multi-Homed AD servers. 1 for production, and 1 for management

In a multi-tenant environment, we have a client that is running a couple of active directory servers on servers that we manage for them. The servers are multi-homed for a primary network which is ...
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3answers
444 views

Windows 7 sending all packets to one nic

I have windows 7 with two nics, one default gateway set on nic1, and no default gateway on nic2. Nics are on different subnets. Nic1 is on 192.168.1.0/24 subnet, and nic2 is on 10.60.194.0/28 network. ...
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1answer
118 views

Multihomed VM workgroup attached to domain clients, resolution issues

hopefully someone here can help me out with this nightmare: I have a corporate network with ADDS, let's make believe this is a 192.168.10.x network. I have a server that runs 3 VMs (one APP server, ...
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3answers
106 views

Can't consistently ping both networks of multihomed host

I have a host which is multihomed, eth0 is on 172.31.254.0/24 and eth0.10 is on 172.31.253.0/24 . Obviously eth0.10 is a subinterface on vlan id 10. From this host I can succesfully ping hosts on ...
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1answer
138 views

AS number with two isolated networks

The company I work for have branches all over Europe and data centers in Sweden and Germany. In Sweden all sites are connected to each other via point-to-point links as well as each connected to ...
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2answers
5k views

Avoiding a multi-homed Domain Controller in a dual network environment

I'm trying to take over an old infrastructure and clean it up, but I'm running into some issues deciding on the new architecture. We have a set of around a dozen or two test/production servers in a ...
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1answer
871 views

Trying to setup Multi-Homing under Ubuntu12 but can only get 1 of 2 IP to accept requests

I am having an issue on some new servers that we are creating under Ubuntu 12 in a virtual box running under VMware(VSphere I believe). This is at an ISP not my desktop. I think that we have the same ...
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1answer
8k views

Citrix Receiver hangs at "Please wait for the Local Session Manager" and published application fails to launch

When a user tries to connect to a Citrix XenApp 6.0 published application on a Windows 2008 R2 server, Citrix Receiver hangs at "Please wait for the Local Session Manager..." Eventually it times out ...
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2answers
2k views

BGP Multi-Homed Cisco Routers Configure For Resilience But Separate Inbound Weight

I've got 2 Cisco routers, each with a single Internet feed, providing BGP with default route only, which allows us to advertise certain routes out each feed. We're not using the full DFZ because ...
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2answers
217 views

Transparent proxy cache on BGP multihome

Provider A have transparent caching with squid . In the situation which a client has multihome BGP with provider A and provider B then client does not send its outgoing traffic (upload) to provider ...
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1answer
1k views

Can't reach multi-homed Ubuntu from different subnet

I have a multi-homed Ubuntu 12.04 server. I have two network interfaces connected to two different IP ranges. 2: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen ...
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1answer
519 views

Multi-homed forward zone DDNS updates always sent out the same network interface

I have a multi-homed server 'dhcp1' with network interfaces '192.168.10.151' (eth0) and '192.168.0.151' (eth1). The machine is attempting to use DDNS with a name server 'ns1' having network interfaces ...
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1answer
80 views

Dual Homed to speed communication between two servers

I have to RHEL 6.4 servers that each have 1000 Mbps Full Duplex NIC Cards. However, the switch between them is only 100 Mbps. Is there any downside to setting both servers up as dual-homed and use a ...
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2answers
952 views

iptables and CONNMARK on ubuntu 12.04

I have Ubuntu 12.04 on a multi-homed host. I am trying to use iptables to reroute HTTP packets coming in to a certain IP address to another IP address. From Googling, I believe it is necessary on ...
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2answers
2k views

DHCP clients: Where is the hostname going to come from

We are building a private cloud here, VMs have at least 2 NICs, sometimes 3 or 4, each may be statically configured for IPv4 and/or IPv6 or be configured by DHCP or a combo of the two. Yes it's a ...
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1answer
2k views

Postfix: "hostname x does not resolve to address y" warning even though it does

Postfix log shows lots of these: warning: hostname client.lab.lan does not resolve to address 192.168.1.153 Yet a DNS lookup from the server shows that it does resolve: # nslookup client.lab.lan ...
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3answers
6k views

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,...
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4answers
2k views

DNS answer based on IP address

I'm running a Windows Server 2003 as a DNS server. I'd like to set up a DNS zone so that the given answer is different depending of the requester's IP address. Let's say I have the zone example.com. ...
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3answers
823 views

Send TCP/IP packets down three routes and pick fastest

Does there exist a way to split TCP/IP traffic across three routes and have the first packets to reach the destination be used? I'm imagining something like multi-homing but with the requirement that ...
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2answers
220 views

Windows 2008 server multihome issue

I have moved from Windows 2003 server to Windows 2008 and have some issues related to IIS or networking I would rather say. I have two NIC's in the server. One is with a fast IP address given by the ...
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2answers
80 views

different name and different IP on a single m/c

I am just a beginner in ip domain etc..I had two questions: if I have configuration on "same" Machine(win or lin) in host file like: m/c name : IP(Example) mac1.net.com 10.124.77.10 and ...
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1answer
636 views

Multihomed Server or What?

The first thing i need say is english isnt my native language so i hope u guys can understand me. I`m willing start host an website and mail services on my home, the problem is i dont have many ...
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2answers
3k views

Using DHCP with Multi-Homed NICs

I am trying to steer away from our current manual addressing system and embrace the decades-old wonder of DHCP. In our domain and even at my home network DHCP is great - I can use address reservations ...
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2answers
3k views

Desktop has two IP addresses, server has decided to refer to it using the wrong one. How do I fix this?

I have a Windows 7 desktop machine, having a static 192.168.*.* IP address on a network full of things with such addresses. I recently received a piece of hardware that I need that machine to talk to ...
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3answers
7k views

How to control source IP addresses from a multihomed server?

My Windows Server 2008 server has several IP addresses bound to it's network card. How do I configure it so that connections originating from certain programs, on certain ports, or to specific ...
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1answer
3k views

Multihomed multi-router setup with Quagga BGP

I'm doing some labs with Quagga on Ubuntu 10.04 LTS as a BGP router in a multihomed and multi router setup. Currently I have setup a fake "ISP" router in my lab and have my two Quagga routers behind ...
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1answer
5k views

How to configure Windows Firewall to protect the external interface but not the internal one?

Windows Server 2008 R2 SP1, running the Edge role of Lync Server 2010. One internal network interface connected to the company LAN, configured with a private IP address, subnet mask, internal DNS ...
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1answer
180 views

Configuring Cisco DHCP Server Multi-Homed Static Leases

I have a network managed by a Cisco router with DHCP. The network is used by some embedded software developers who use kit with fixed IP addresses. We'd like to configure their machines to use DHCP, ...
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2answers
2k views

Multihomed ubuntu inbound connectivity issue

I have a multi-homed system (Ubuntu server, 11.04) where eth0 is lan and eth1 is wan. There is internet connectivity through both, but via different routes. When the system boots, I cannot connect to ...
0
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3answers
298 views

Multihomed email

Our primary MX record points to an external server which handles spam filtering, thereafter the mail is pushed to our internal mail server. The mail is never stored on the external server for longer ...