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Where do you place a load balancer?

Generally your load balancer needs to in a position where it has the ability to terminate connections to your public IPs (assuming you are load-balancing a public-facing site). Your servers can then ...
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6 votes
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How do load balancers fit in to a data center with much higher throughput than they can handle?

Do the load balancers not become a bottleneck in certain traffic conditions? Certainly, but this is generally not the case in a well engineered network. You should be able to design your network in ...
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6 votes
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Measurement of Traffic Parameters using SNMP

First, do 'Octets' in ifInOctets and ifOutOctets actually refer to packets? Can someone explain in detail? ifInOctets and ifOutOctets refer to bytes received and transmitted (respectively) by the ...
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6 votes
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F5 BigIQ communication with BigIP

F5 has a REST API available, documentation and examples can be found on https://devcentral.f5.com. If you have some programming skills, writing some scripts in python to do things isn't that hard. ...
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  • 15.6k
5 votes
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What's the difference between interdomain and intradomain load balancing?

To answer this question, we have to define the term "domain". Easily spoken, the Internet is a network of networks. In BGP terminology, there are many Autonomous Systems (AS) on the Internet, each of ...
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  • 1,039
5 votes

How can we reset a service account password in the F5 CLI?

Using tmsh to modify the system maintenance account passwords Impact of procedure: Performing the following procedure should not have a negative impact on your system. Log in to the TMOS Shell (tmsh)...
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5 votes

What's the meaning of requests in Load-balancer?

That seems to use the term 'request' both for DNS queries and for HTTP requests, which makes it a bit confusing. Most load balancers however are able to balance all kinds of application protocols, ...
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  • 15.6k
4 votes

Session, loadbalancer and Akamai

If I recall correctly, Akamai performs multiple requests in one TCP/HTTP connection to your origin. If using F5 (but could be of interest as well if not), see http://support.f5.com/kb/en-us/solutions/...
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4 votes
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F5 VIP required to have on External VLAN?

SelfIP is for sure needed on External as that's where it will arp out for the VIP address. The one on VLAN 10 should be used so it can locally contact the box, otherwise it will refer to the route ...
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  • 566
3 votes

F5 auto SNAT not working

SNAT automap applied to a VIP will only affect traffic that has arrived inbound to the VIP. It won't affect traffic initiated from your real servers heading outbound. For that, you will need to ...
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  • 13.9k
3 votes

What's the difference between interdomain and intradomain load balancing?

Two paths with equal cost is often called equal-cost multipath (ECMP) mechanism. ECMP often works well, but there are a few caveats. Before you get to the issue of running BGP over parallel links, it’...
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  • 41
3 votes
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F5 Routing - Default Route or IP Forwarding Virtual Server?

You're not alone, there is often confusion about the Forwarding Virtual Server, and what role it serves in an F5 LTM. Not having watched the video in question, I can only speculate on exactly what ...
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3 votes
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Moving to vlans from a basic network

If the problem is MOSTLY running out of addresses, all you need to do is move to larger subnets - go from /24 to /22 and you have 4x (+6) the addresses you had on /24. In order to move to VLANs you ...
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  • 2,736
3 votes
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F5 loading balancing - Routing requests to specific server in pool when specified in the request?

You could do this with iRules. The admin override would request the page adding a cookie like so: http://somesite.com?override=web1 Then the iRule would look for an an HTTP Cookie of override ...
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  • 13.9k
3 votes
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Using SSL with Cisco Network Load balancer

Load balancing SSL is tricky. (I and several coworkers hold a patent on how to do it without decoding the traffic.) If you have a 1:1 NAT, there should be no problems... everything always goes to the ...
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  • 29.5k
3 votes

F5 backup whole bigIP configuration and save UCS

(tmos)# save /sys ucs Configuration Items: foobar.ucs I guess you are under tmos shell, right? I mean you have to enter in tmos shell running the command "tmsh". Then, you have to write the rest ...
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2 votes

How do load balancers fit in to a data center with much higher throughput than they can handle?

This is indeed a bottleneck and will limit your throughput to the "weakest link in the chain" which is your LBs. However, you can get around it. If you use something known as "switchback" or "direct ...
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2 votes

Load balancing vs hardware clustering

Load balancing spreads incoming requests across a pool of servers, each of which is a mostly independent system. Clustering creates one big server out of a pool of hardware boxes, which are tightly ...
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2 votes

What is the difference between uplink and downlink (JMeter)?

in terms of server and client communications . based on stream or traffic traffic going from the server to the clients called downstream , and from clients to server called upstream . based on device ...
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  • 3,404
2 votes

Load balancer features - load compensation

I know at least F5 LTM has a feature where it monitors performance of each pool member and adjust its loadbalancing method based on this: Predictive (member): [...] the system analyzes the trend of ...
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  • 15.6k
2 votes
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Load balancer features - load compensation

Some manufacturers have this feature. It is an agent that runs on the host and reports the load back to the load balancer. Some reasons for not using it: CPU usage fluctuates quite a bit, and isn't ...
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  • 62.1k
2 votes

Web server address with two ISPs

Unfortunately BGP will not help you, this is small-scale. You will not be able to justify a provider-independent block of addresses for a single web server even if RIPE is still issuing them. ...
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  • 1,181
2 votes
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load balancer in high availibility

It depends on what risk you are trying to mitigate against. If you use virtual machines, you are mitigating against software errors on the load balancers. But you are still vulnerable to a hardware ...
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  • 62.1k
2 votes
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F5 backup whole bigIP configuration and save UCS

I had an operator role. I needed to have an administrator or iRule Manager(or something similar?) role only for this to show up!
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  • 235
2 votes

Where should I locate F5 Load Balancer in Network Segmentation?

As @Zac67 already mentioned, there's not one best practice here. There are a few things to consider here: what function does the firewall have? Does it just do stateless inspection? Or is it a ...
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  • 15.6k
1 vote
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Is dual WAN load balancing possible for traffic to/from a webserver

the 50/5 mbps bandwidth provided by our ISP. They can not offer us a higher bandwidth connection but they can offer us a second connection at the same bandwith. With a traffic ratio like that i'm ...
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  • 11.6k
1 vote
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Web server address with two ISPs

The most appropriate solution for you is to run BGP with your own address space. Then you can allocate your own Provider Independent address to the server and advertise it to both ISPs. Otherwise any ...
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  • 1,118
1 vote

What is the difference between uplink and downlink (JMeter)?

From your side: Upplink is the traffic that you send to your ISP, request, and all the another stuff. Downlink, by th other side, is traffic that you download, traffic from your ISP to you.
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1 vote

Supporting 100+ WiFi Devices at a time

It could be the load balancer or several other things: Most APs slow down with more than 20 clients. It could be channel contention. Make sure you have disabled low speeds (1-11Mbps) on each AP. It ...
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  • 62.1k
1 vote

Load Balancing System For 2 Servers on Different Datacenters

What you need is a DNS server that does health checks. There are both on-prem and hosted options available from multiple vendors. These can serve up DNS responses based on (among other things): ...
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  • 1,783

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