Questions tagged [multi-homed]

The multihomed / multi-homed tag is for a single PC or server with multiple NICs connected to different networks or multiple vLans on a single NIC. Multiple NICs can present unique challenges and expose the sysAdmin to unexpected routing, even make a machine less secure.

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Change TeamCity IP address and port number on multi-homed Windows Server 2008 running IIS 7

After two full days of "research" (read: banging my head against my keyboard) and cursing at TeamCity/MSDN/Tomcat documentation as well as phantom IIS bindings, I've come up with an answer to a very ...
Brad B.'s user avatar
  • 431
7 votes
1 answer
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 ...
Jim Dennis's user avatar
7 votes
2 answers
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 ...
furriephillips's user avatar
5 votes
3 answers
7k 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,...
tfrederick74656's user avatar
4 votes
9 answers
16k views

Best solution for Multi-WAN failover (inside & out)? [closed]

Looking for a way to setup 2 ISPs in failover mode, for both incoming & outgoing traffic, for our small (<100 devices) network. The leading contender for now seems to be the Peplink Balance ...
Sean O's user avatar
  • 277
4 votes
2 answers
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 ...
tacos_tacos_tacos's user avatar
4 votes
2 answers
358 views

Is MySQL Cluster appropriate for a small, low-volume multi-homed system?

I'd like to multi-home a proprietary web-based application for a relatively small user base with modest dataset size. Scalability is not as much of a concern as extremely high availability. The ...
dlo's user avatar
  • 471
4 votes
2 answers
257 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 ...
Omid Kosari's user avatar
3 votes
4 answers
10k views

How serious is a problem is multi-homed networks?

Multi-homed is the term that I have heard for being connected to a LAN at the same time as being connected to the internet via something like a wireless connection. I have heard that this is so ...
Robert MacLean's user avatar
3 votes
3 answers
2k views

DHCP Relay vs Multi-Homed DHCP Server

I'm sketching out a new network topology and I'm unsure of how to solve the issue of DHCP between two VLANs. 10.50.2.0/23 will hold the majority of our users, corporate wifi, printers etc. 10.250.3.0/...
Craig Watson's user avatar
  • 9,670
3 votes
3 answers
3k views

Configuring multi-homed Windows Vista/2008 machine to ignore default gateway and DNS server settings on one adapter?

I've got a Windows 2008 machine with two network adapters in it. One's connected to the corporate network, and the other's connected to a private (lab) network. They're both configured by DHCP. They ...
Roger Lipscombe's user avatar
3 votes
3 answers
187 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 ...
TSG's user avatar
  • 1,852
2 votes
2 answers
3k 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 ...
Malvineous's user avatar
  • 1,145
2 votes
4 answers
5k 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. ...
Spack's user avatar
  • 1,624
2 votes
2 answers
3k views

Issues resolving DNS entries for multi-homed servers

This is difficult to explain, so bear with me. We have 2 domain controllers, each multi-homed to straddle 2 internal subnets, (subnet A and subnet B) and provide dns, dhcp, and ldap authentication. ...
I.T. Support's user avatar
2 votes
2 answers
6k 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 ...
Artiom's user avatar
  • 145
2 votes
1 answer
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 ...
Jochen's user avatar
  • 51
2 votes
2 answers
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 ...
Grogg's user avatar
  • 21
2 votes
1 answer
961 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 ...
Paul Hardwick's user avatar
2 votes
1 answer
558 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 ...
jerry's user avatar
  • 21
2 votes
1 answer
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 ...
Massimo's user avatar
  • 71.2k
2 votes
1 answer
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-...
clee's user avatar
  • 253
1 vote
3 answers
424 views

Cisco BGP question about advertising routes

I have the following config and understand what's happening pretty well with everything except the routes I'm advertising. In other words it's INBOUND traffic I have a question about. What I 'want' to ...
Domino's user avatar
  • 13
1 vote
3 answers
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 ...
Xaqron's user avatar
  • 218
1 vote
2 answers
3k 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 ...
Ira's user avatar
  • 139
1 vote
3 answers
971 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 ...
chillitom's user avatar
  • 123
1 vote
2 answers
434 views

Exchange and routing of messages

I have Exchange 2007 installed on a W2k8 box with two NICs. How can I tell Exchange to route all outgoing SMTP traffic out via a specific NIC? Edit: Can I do it via the W2k8 firewall/routing?
Marius's user avatar
  • 115
1 vote
1 answer
5k 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 ...
Andrew Myers's user avatar
1 vote
1 answer
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 ...
user avatar
1 vote
0 answers
46 views

Internet failover on Cisco ASA 5500 series Primary ISP is on DHCP address and so is backup. Always defaults to backup

I had SLA MONITOR setup on my ASA and working fine for months. All traffic was routing through my primary connection. I rebooted my ASA after a firmware upgrade. When it came back, it would always ...
c240amg's user avatar
  • 11
1 vote
1 answer
841 views

How can I mount an NFSv4 export with multiple IPs

I have a Synology with 2 controllers exporting an NFSv4 share. The NFS export can be accessible via any of the 2 IPs (which are on different subnets). How on a CentOS/RHEL/Rocky Linux distro, can I ...
cohortq's user avatar
  • 475
1 vote
0 answers
63 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 ...
simon_dmorias's user avatar
1 vote
2 answers
827 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 ...
cqcallaw's user avatar
  • 163
1 vote
1 answer
1k 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 ...
Fredster's user avatar
1 vote
1 answer
907 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 ...
300baud's user avatar
  • 111
1 vote
2 answers
666 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 ...
Deprived.Writer's user avatar
1 vote
3 answers
491 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. ...
zdravke's user avatar
  • 21
1 vote
1 answer
123 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, ...
ToddBlan's user avatar
1 vote
1 answer
158 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 ...
Par S's user avatar
  • 13
1 vote
1 answer
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 ...
Andreas Falck's user avatar
1 vote
1 answer
319 views

OptiQroute does not favor weighted WAN connection

I have an interesting problem: Our load balancer (a FiberLogic OptiQroute 2140) seems to consistently favor one WAN connection over another (and not one I want it to). We have two WAN connections ...
user avatar
1 vote
1 answer
437 views

How to configure machines in a public subnet with two gateways?

We have a single public /24 subnet, with a BGP router as the primary gateway. Now I'm interested in configuring a second router for redundancy. How do I deal with multiple gateways on the servers in ...
Shtééf's user avatar
  • 1,235
0 votes
1 answer
3k views

Can I use BIND to provide DNS resolution for two isolated networks via a dual-homed DNS server?

I am setting up two small isolated networks. Neither of these networks will have an Internet connection. I am trying to provide DNS and DHCP to both networks via a single Ubuntu server I have ...
romandas's user avatar
  • 3,362
0 votes
1 answer
2k 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 ...
user2938984's user avatar
0 votes
1 answer
90 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 ...
user739866's user avatar
0 votes
2 answers
1k 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 ...
bluedog's user avatar
  • 101
0 votes
3 answers
333 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 ...
Richard Keller's user avatar
0 votes
1 answer
287 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 ...
haelix's user avatar
  • 217
0 votes
1 answer
198 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 ...
ajh4's user avatar
  • 1
0 votes
2 answers
82 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 ...
shashank's user avatar