0
votes
1answer
45 views

Avoiding a Single Point of Failure with link aggregation

I have a requirement for a system with no Single Point of Failure. The client have offered two Ethernet cables per server. Each of the servers will connect into their network, however I want to ...
1
vote
0answers
69 views

Redundant Debian Gateway

I have to configure a redundant gateway with Debian boxes and I would like to get some recommendation what's the best solution in my case. There are certain limitations in my setup and I have to go ...
0
votes
1answer
339 views

XenServer HA (failover VM's) without shared storage

In the university from Uruguay where I work, we have 2 IBM BladeCenter S with 4 server blades each one. Each blade have XenServer 6.2 installed and working. Our idea is have each BladeCenter in ...
1
vote
1answer
324 views

LAN Redundancy - NIC, Cables + Switch?

I'm trying to move to a HA solution and would like to understand what hardware is required to have redundancy in the NICs, switch and cables. The diagrams below show how I envisage a non-redundant ...
0
votes
0answers
53 views

Number of public ips for wackamole

I am trying to configure a highly available cluster consisting of three boxes with public ips. How many public IP addresses will I require for this? Can I configure spread on a private NIC and manage ...
2
votes
1answer
655 views

ESXi Beacon Probing Limitation - Three Switches Required?

We are currently using Link Status Only for our NIC Teams on our VM hosts, but recently ran into an issue where one of our two switches had a memory error and stopped passing traffic. All of our VM ...
1
vote
1answer
181 views

Bond0 Failover when link light stays up: High Availability Network

Configuration: Two switches, each with a separate internet route Centos servers with eth0 and eth1 bonded as an active-backup on bond0, eth0 in on switch and eth1 in the other /etc/modprobe.conf ...
0
votes
0answers
227 views

Strange Keepalived VRRP email notification

I have a 3 nodes keepalived (K1 to K3) installed and receiving email notification. The setup of keepalived is K1 VI_50, priority 100 VI_51, priority 98 VI_52, priority 99 K2 VI_50, priority 99 ...
-1
votes
1answer
103 views

Relying on shared disks for heartbeat

I read somewhere that using shared disks for heartbeats is reliable even if network totally fails. I read it in the context of remedy from split-brain. Is this correct? But I can not understand this. ...
1
vote
1answer
202 views

ssh host key management between ha hosts

We have a setup with 2 Redhat-based servers which are both ha hosts behind a virtual ip. 192.168.0.3 dataserver (virtual ip) 192.168.0.1 dataserver_ha1 (physical server) 192.168.0.2 dataserver_ha2 ...
4
votes
3answers
190 views

Risks of Network Partitioning When a Split Brain Creates a Security Flaw

I'm looking to create a high-availability, scalable networking solution by using a distributed system of data. A node here, describes a network that has control over one copy of the data. These nodes ...
0
votes
1answer
2k views

keepalived doesn't listen on virtual IP

I'm learning to use keepalived; for now within a single machine - just to make sure the forwarding works. I've started a mock webserver listening on 192.168.56.200:8080. It just replies with the ...
0
votes
1answer
60 views

Office network failover? [duplicate]

Possible Duplicate: What hardware do I need to add a backup internet connection? I have a office LAN providing internet access to several workstations. Each workstation is basically ...
0
votes
1answer
225 views

Network GURUs - IP failover combined with load-balancing… Is there such software? Is it possible?

I've been playing around with high-availability solutions for a few days and so far I find UCARP very useful for IP fail-overing. It's dead simple and does the job. I was thinking about taking it a ...
1
vote
1answer
372 views

How do I load balance between two Linux machines?

Inspired by the Stack Overflow network, I am now obsessed with HAProxy and trying to use it myself. At the moment, each HAProxy box has got two network cards (well, two configured, I can have a ...
3
votes
1answer
5k views

Keepalived for more than 20 virtual addresses

I have set up keepalived on two Debian machines for high availability, but I've run into the maximum number of virtual IP's I can assign to my vrrp_instance. How would I go about configuring and ...
0
votes
1answer
399 views

How do I configure a virtual IP interface on RHEL 4 for HA failover

I have two servers, each with a physical IP address on a physical network interface: Server A: 192.168.0.1 (eth0) - PRIMARY Server B: 192.168.0.2 (eth0) - BACKUP I want to run an application on ...
1
vote
2answers
47 views

combined connection for 3 non-stable channels

I have 3 non-stable connections between 2 my Linux servers located in different countries. These 3 connections have different routes. From time to time one or two connections have packet loss problem ...
1
vote
1answer
229 views

Multiple IPs on single interface - force source IP address

I have an interface eth1 on host A with two different IP addresses (let's say 10.0.0.1 and 10.0.0.3). The .1 is the standard IP of the host and .3 is the failover IP that can be switched over to ...
36
votes
6answers
6k views

Windows 2008 ignores Gratuitous ARP requests

We recently saw an issue after a fail over of our router where our Windows 2008 Boxes didn't start talking to the primary router after fail-back. When we did some digging they still had the ARP ...
4
votes
2answers
532 views

Google network architecture

I am aware that this question might be closed as "not a real question", "subjective" or even "argumentative". If this is a mistake, I am sorry. I am not good at all at networking but I'm trying to ...
2
votes
2answers
782 views

load balancing, high availability for webapp setup

We have build a special interest social network and need to setup now the proper server setup for the webapp servers. We have for the webapp 5 physical server available (2xE5645 CPU, 24 GB Ram, RAID, ...
0
votes
2answers
370 views

Can I replace a router and DHCP server without disrupting traffic?

I have a device which acts as a router and DHCP server. I'm replacing it, and would like to minimize down time. If I unplug it, and plug in a different device with the same IP, will all the PCs ...
2
votes
3answers
3k views

OpenVPN multiple servers on the same subnet, high availability

Hey everyone. Let me start by saying that my Linux experience isn't super awesome but I can usually find my way around things easily. Over at work we have an OpenVPN setup that's been due for some ...
1
vote
1answer
487 views

Using Windows Network Load Balancing for one IP only?

When configuring NLB, you choose the cluster IP. This removes any other secondary IP addresses for the network adapter. How can I have one cluster IP shared by NLB while still having multiple ...
0
votes
1answer
141 views

Moving from a single IIS to a webfarm using NLB with minimal downtime?

Say the IP of our website is 1.1.1.1, and we want to set up NLB, is it best to set 1.1.1.1 as the virtual IP - could mess this up and cause downtime... Better to set the virtual IP as 1.1.1.2, then ...
5
votes
2answers
364 views

Is this a reasonable architecture for a newspaper site?

We run a newspaper-style site and are consolidating our architecture from one that grew amorphously into a more scalable, resiliant solution. I was thinking of the following: internet | h/w ...
2
votes
2answers
1k views

Network load balancing, efficience and limits?

I'm about to study about NLB on Windows Server 2003. It archives both of my interests now: scalability and high-availability. But I don't know about its power in production environment. Is NLB a ...