Solved

Default Gateway - more than one?

Posted on 2013-01-30
8
442 Views
Last Modified: 2013-01-31
HI,

Can you have multiple default gateways and if so, can you run multiple default gateways at the same time?

Thanks
0
Comment
Question by:fredostare
  • 2
  • 2
  • 2
  • +1
8 Comments
 
LVL 9

Expert Comment

by:IntegrityOffice
ID: 38837471
Go to the advanced tab on your TCP/IP4 ( I am assuming Windows here ) and add separate default gateways, you need to weight them (add metric ) for the priority
0
 

Author Comment

by:fredostare
ID: 38837485
Thanks! Would you use more than one default gateway for redundency? And is it actually advisable? I've heard it shouldn't be done, and others say it's fine...
0
 
LVL 9

Expert Comment

by:IntegrityOffice
ID: 38837512
I often have a piece of hardware ( such as a watchguard firewall ) and I let that do the load balancing across the two broadbands. I can then use it to do "policy based routing"

Eg

Fast broadband Internet, VPN connectios
Slow one mail and maybe webmailHTTPs access, DNS

The advantage here is that I setup the lines to use the above protocols but there is also a what happens if BB1 fails it all flicks to BB2 in less than 45 seconds. ( that is configurable )

If you are really worried about a hardware failure you can HA ( high availability ) link two filrewalls together so you do not need to worry about a single point of failure.

Also if you are using something like a Watchguard you can use all the wonderful features of UTM. There are many firweall operators that do this but I have been using it on sites with WG for several years now.
0
Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

 
LVL 50

Expert Comment

by:Don Johnston
ID: 38837609
Can you have multiple default gateways and if so, can you run multiple default gateways at the same time?

You can have multiple default gateways defined, but only one will be used at any given time.

If you want first hop redundancy then a FHRP (First Hop Redundant Protocol) such as VRRP, HSRP or GPBP would be used on the layer three devices which are the default gateways.
0
 
LVL 77

Accepted Solution

by:
Rob Williams earned 500 total points
ID: 38838447
Multiple default gateways in Windows do not work as they should.  Firstly "default" by definition can only be one, but Windows allows a failover default gateway.  Unfortunately if the higher metric gateway fails, even for a second, the lower metric gateway takes over, but under no condition does it ever switch back as it should, without a reboot.  This in no way allows for load balancing between the two gateways.  That requires a dual WAN port router.
0
 

Author Comment

by:fredostare
ID: 38839186
Hi all, so is best practice to avoid having a client point to two default gateways on a windows system, and rather deal with redundancy at the gateway itself instead?
0
 
LVL 50

Expert Comment

by:Don Johnston
ID: 38839221
Hi all, so is best practice to avoid having a client point to two default gateways on a windows system, and rather deal with redundancy at the gateway itself instead?
Correct.
0
 
LVL 77

Expert Comment

by:Rob Williams
ID: 38839511
Windows will even warn you of that if you try to add a second agteway, though it will accept it.
0

Featured Post

Manage your data center from practically anywhere

The KN8164V features HD resolution of 1920 x 1200, FIPS 140-2 with level 1 security standards and virtual media transmissions at twice the speed. Built for reliability, the KN series provides local console and remote over IP access, ensuring 24/7 availability to all servers.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

#Citrix #Citrix Netscaler #HTTP Compression #Load Balance
Data center, now-a-days, is referred as the home of all the advanced technologies. In-fact, most of the businesses are now establishing their entire organizational structure around the IT capabilities.
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
Here's a very brief overview of the methods PRTG Network Monitor (https://www.paessler.com/prtg) offers for monitoring bandwidth, to help you decide which methods you´d like to investigate in more detail.  The methods are covered in more detail in o…

838 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question