Hi, i have a network of over 300 dhcp clients and i want to use 3 routers with one dhcp each. Clients should get an ip from one router , but be able to talk to the other clients that have acquired ip from an other dhcp. No internet, its just an intranet.
How to set up this please?
Re: How to use 3 DHCP for load balancing and Failover
How many ISPs do you have and what is their throughput.........
which 3 routers are you using.
what is the price of tea in china,
What is the airspeed velocity of an unladen swallow,,,,,,
do you mean the european swallow or the african swallow................
which 3 routers are you using.
what is the price of tea in china,
What is the airspeed velocity of an unladen swallow,,,,,,
do you mean the european swallow or the african swallow................
Re: How to use 3 DHCP for load balancing and Failover
u can play with delay threshold, but be careful, do small lab and test it first.
Re: How to use 3 DHCP for load balancing and Failover
Thanks for the reply.
3x RB951G running mipsbe and one dhcp each. No ISP. Just plain intranet.
3x RB951G running mipsbe and one dhcp each. No ISP. Just plain intranet.
Re: How to use 3 DHCP for load balancing and Failover
Thanks for the reply.How many ISPs do you have and what is their throughput.........
which 3 routers are you using.
what is the price of tea in china,
What is the airspeed velocity of an unladen swallow,,,,,,
do you mean the european swallow or the african swallow................
3x RB951G running mipsbe and one dhcp each. No ISP. Just plain intranet. i just need my clients to get an ip and see each other. nothing more.
Last edited by ccz117 on Tue Mar 07, 2023 9:40 am, edited 1 time in total.
Re: How to use 3 DHCP for load balancing and Failover
Thanks for the tip. but im a beginner, i need to do some other steps first. can you quide a little? thanksu can play with delay threshold, but be careful, do small lab and test it first.
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jvanhambelgium
Forum Veteran
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Re: How to use 3 DHCP for load balancing and Failover
Since it is only "Intranet" you can deal with the failover/redudancy by using a larger scope and divide it across the 3
Eg. 172.16.0.0/16 , so this is a large IP-space, especially for only 300 devices.
On all 3 , the "network" would be 172.16.0.0/16 , but the differences will be in the ip-pools
Router 1 : Have it distribute 172.16.1.1 up to 172.16.2.254 , provide mask 255.255.0.0 and the gateway if needed ? (eg. gateway 172.16.0.1) and create such interface on your LAN
Router 2 : Have it distribute 172.16.3.1 up to 172.16.4.254 , provide mask 255.255.0.0
Router 3 : Have it distribute 172.16.5.1 up to 172.16.6.254 , provide mask 255.255.0.0
So, the client will cry for a dhcp-offer and the first to respond will make it happen, IF even 2 of your routers are "out", 1 router still has a "pool" large enough to provide for 300 clients.
Don't worry about "load balancing" , 300 clients is ... nothing ....if you would say I have 10.000 or 30.000 endpoint then you need to make some solid dhcp-architecture too.
Eg. 172.16.0.0/16 , so this is a large IP-space, especially for only 300 devices.
On all 3 , the "network" would be 172.16.0.0/16 , but the differences will be in the ip-pools
Router 1 : Have it distribute 172.16.1.1 up to 172.16.2.254 , provide mask 255.255.0.0 and the gateway if needed ? (eg. gateway 172.16.0.1) and create such interface on your LAN
Router 2 : Have it distribute 172.16.3.1 up to 172.16.4.254 , provide mask 255.255.0.0
Router 3 : Have it distribute 172.16.5.1 up to 172.16.6.254 , provide mask 255.255.0.0
So, the client will cry for a dhcp-offer and the first to respond will make it happen, IF even 2 of your routers are "out", 1 router still has a "pool" large enough to provide for 300 clients.
Don't worry about "load balancing" , 300 clients is ... nothing ....if you would say I have 10.000 or 30.000 endpoint then you need to make some solid dhcp-architecture too.
Re: How to use 3 DHCP for load balancing and Failover
thank you so much for the reply.Since it is only "Intranet" you can deal with the failover/redudancy by using a larger scope and divide it across the 3
Eg. 172.16.0.0/16 , so this is a large IP-space, especially for only 300 devices.
On all 3 , the "network" would be 172.16.0.0/16 , but the differences will be in the ip-pools
Router 1 : Have it distribute 172.16.1.1 up to 172.16.2.254 , provide mask 255.255.0.0 and the gateway if needed ? (eg. gateway 172.16.0.1) and create such interface on your LAN
Router 2 : Have it distribute 172.16.3.1 up to 172.16.4.254 , provide mask 255.255.0.0
Router 3 : Have it distribute 172.16.5.1 up to 172.16.6.254 , provide mask 255.255.0.0
So, the client will cry for a dhcp-offer and the first to respond will make it happen, IF even 2 of your routers are "out", 1 router still has a "pool" large enough to provide for 300 clients.
Don't worry about "load balancing" , 300 clients is ... nothing ....if you would say I have 10.000 or 30.000 endpoint then you need to make some solid dhcp-architecture too.
So, like this my clients can see each other, even if they get an ip from a different dhcp server?
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jvanhambelgium
Forum Veteran
- Posts: 990
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- Location: Belgium
Re: How to use 3 DHCP for load balancing and Failover
They are all in 1 large IP-space so they can communicate with each other, and the DHCP-server does not matter.thank you so much for the reply.Since it is only "Intranet" you can deal with the failover/redudancy by using a larger scope and divide it across the 3
Eg. 172.16.0.0/16 , so this is a large IP-space, especially for only 300 devices.
On all 3 , the "network" would be 172.16.0.0/16 , but the differences will be in the ip-pools
Router 1 : Have it distribute 172.16.1.1 up to 172.16.2.254 , provide mask 255.255.0.0 and the gateway if needed ? (eg. gateway 172.16.0.1) and create such interface on your LAN
Router 2 : Have it distribute 172.16.3.1 up to 172.16.4.254 , provide mask 255.255.0.0
Router 3 : Have it distribute 172.16.5.1 up to 172.16.6.254 , provide mask 255.255.0.0
So, the client will cry for a dhcp-offer and the first to respond will make it happen, IF even 2 of your routers are "out", 1 router still has a "pool" large enough to provide for 300 clients.
Don't worry about "load balancing" , 300 clients is ... nothing ....if you would say I have 10.000 or 30.000 endpoint then you need to make some solid dhcp-architecture too.
So, like this my clients can see each other, even if they get an ip from a different dhcp server?
Can you draw how these 300 clients are connected ? I mean, you must have various LAN-switches and somewhere these 3 RB915G's must also be in that same IP-space.
As long as you provide a 255.255.0.0 "mask" to each client within that large 172.16.x.x "block" you are good.
I assume you do not have anything like VLAN's ? Just 1 "flat" network ?
Re: How to use 3 DHCP for load balancing and Failover
Hi. yes, its plain flat. the reason i am using 3x dhcp is frequent power cuts that can affect one or two routers...so at least one can serve the clients remaining.They are all in 1 large IP-space so they can communicate with each other, and the DHCP-server does not matter.
thank you so much for the reply.
So, like this my clients can see each other, even if they get an ip from a different dhcp server?
Can you draw how these 300 clients are connected ? I mean, you must have various LAN-switches and somewhere these 3 RB915G's must also be in that same IP-space.
As long as you provide a 255.255.0.0 "mask" to each client within that large 172.16.x.x "block" you are good.
I assume you do not have anything like VLAN's ? Just 1 "flat" network ?
Question: the clients will not need a gateway? if an assign one, and its the one going down what happens?
Thank you again for your time.
Re: How to use 3 DHCP for load balancing and Failover
hi.
sure. no problem. each dhcp server in the same subnet needs separate block to offer, along with their specific setting. but unfortunately it doesn't work smoothly on session based traffic.
you can specify as many gateway as you want in dhcp server gateway options settings for your clients use, but that method won't work magically for any fail over for dhcp clients.
did you mean: each dhcp server provides it's own gateway?Question: the clients will not need a gateway? if an assign one, and its the one going down what happens?
sure. no problem. each dhcp server in the same subnet needs separate block to offer, along with their specific setting. but unfortunately it doesn't work smoothly on session based traffic.
you can specify as many gateway as you want in dhcp server gateway options settings for your clients use, but that method won't work magically for any fail over for dhcp clients.
Re: How to use 3 DHCP for load balancing and Failover
It seems what you need are three UPS, more than anything.
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jvanhambelgium
Forum Veteran
- Posts: 990
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- Location: Belgium
Re: How to use 3 DHCP for load balancing and Failover
Ahhh..that is not going to workHi. yes, its plain flat. the reason i am using 3x dhcp is frequent power cuts that can affect one or two routers...so at least one can serve the clients remaining.
Question: the clients will not need a gateway? if an assign one, and its the one going down what happens?
Thank you again for your time.
You cannot gain failover with regards to that aspect.If you have 1 "flat" network why not look at VRRP ?
If you network is flat and you don't have Internet ... WHAT IS the gateway ? You need one ? Is any of these 3 routers a gateway to somewhere ??
Re: How to use 3 DHCP for load balancing and Failover
No, dont tell me you need to see a network diagram and a better understanding of the requirements.....
JV now fully engaged in playing whackamole LOL ( not even a full config seen yet )
JV now fully engaged in playing whackamole LOL ( not even a full config seen yet )
Re: How to use 3 DHCP for load balancing and Failover
Hi again, i have tried without a gateway and it seems to work. VRRR seems nice though, i ll give it a try. thanks my friend.Ahhh..that is not going to work
Hi. yes, its plain flat. the reason i am using 3x dhcp is frequent power cuts that can affect one or two routers...so at least one can serve the clients remaining.
Question: the clients will not need a gateway? if an assign one, and its the one going down what happens?
Thank you again for your time.
If you have 1 "flat" network why not look at VRRP ?
If you network is flat and you don't have Internet ... WHAT IS the gateway ? You need one ? Is any of these 3 routers a gateway to somewhere ??
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jvanhambelgium
Forum Veteran
- Posts: 990
- Joined:
- Location: Belgium
Re: How to use 3 DHCP for load balancing and Failover
If you only need to communicate among your 300 clients you do not need a gateway. Case closed and this solution will work.Hi again, i have tried without a gateway and it seems to work. VRRR seems nice though, i ll give it a try. thanks my friend.
Ahhh..that is not going to work
If you have 1 "flat" network why not look at VRRP ?
If you network is flat and you don't have Internet ... WHAT IS the gateway ? You need one ? Is any of these 3 routers a gateway to somewhere ??
If you have some requirement for some concept of gateway, please post a drawing because things can get more complex quickly.
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