Networking

How to set up source nat routing (SNAT) in iptables to load balance outbound connections across multiple IP addresses

In our earlier days, before IOFlood, some of us ran web based proxy services. These were popular at workplaces or schools for accessing websites that were blocked there, such as gmail and myspace (remember myspace?). One common problem that came up, was that with so many users each sharing one IP on one server, our

Configuring additional IP addresses (virtual interfaces) on Centos Servers

You may have a Centos dedicated server or VPS, and you’ve been assigned additional IP addresses, which have not been configured by your hosting provider. There are good reasons your host won’t have configured these for you, because if you are using virtualization, many VPS control panels need to manage these IPs, and so it

nf_conntrack: table full, dropping packet — A solution for CentOS Dedicated Servers

A common problem you may experience is sluggish performance or disconnections from your Centos dedicated server, even though there is sufficient CPU, ram, disk i/o, etc. After some troubleshooting, you may come to believe you are being DDoS attacked, but you don’t see an unusual amount of traffic, and there’s no single IP or handful

DDoS protection, does my server need it?

Many of us have heard about DDoS attacks recently, as they are becoming more and more common and reported in the news. Some of us may have been targeted by them, or otherwise impacted. A question we get from a lot of customers is “Do I need DDoS protection?” The answer is much like “what

Troubleshooting high linecard CPU use / exhaustion on Brocade MLX and MLXe routers

Today we’re going to be talking about a poor design decision in the Brocade MLX and MLXe series routers that can lead to CPU exhaustion on your router line cards. Overall we’re very happy with the Brocade MLX. After all, every routing platform has its quirks, so one small problem that is easily solved is

Real world performance of Brocade Foundry FESX-448-PREM — CPU exhaustion

In case you’re still using the Brocade / Foundry FESX-448-PREM for doing routing on your network, I thought I would share some of the performance limitations we’ve seen on that platform. We’ve long since upgraded our network to use newer and more powerful Brocade MLX routers, but wanted to share our experience so others could

IOFLOOD.com — Phoenix, AZ dedicated server BGP network improvements

IOFLOOD.com is proud to announce that we’ve completed a series of upgrades to our network to maximize performance and reliability for our dedicated server customers. Our new network topology now contains a blend of 4 carriers: Tinet — 1x 10gbps Telia Sonera — 1x 10gbps -New- Cogent — 1x 10gbps HE.net — 2x 1gbps Tinet

e1000e NIC link failure / x9scm / x9scl / patch fix for Centos

If you’ve had problems with the nic driver failing on x9 / x10 supermicro motherboards with the intel e1000e NIC, we have a fix for you. Centos 6 on X9 motherboards (x9scl / x9scm) seems to have the most problems, but other motherboards and OS’s are potentially affected as well. There are a lot of