Category Archives: Networking

Port Forwarding with systemd

Using Port Forwarding with xinetd has served me well at many occasions. As time proceeds, new technologies show up that allow for similar functionality and others are deprecated. When reading about the obsoletion of xinetd in SLES15, I wondered if … Continue reading

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Port Forwarding with xinetd

In some network environments, where for example administration lans or some private lans are deployed, it might still be necessary to access a specific port of a machine inside that lan from the outside. Commonly, you would have to access … Continue reading

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Persistent IUCV Network Devices

On mainframes, Inter User Communication Vehicle provides a means to exchange data between two guests in z/VM. Some time ago, this has been one of the preferred networking methods between two Users (virtual machines) on z/VM. From a linux perspective, … Continue reading

Posted in Mainframe, Networking, udev, z Linux | Tagged , , | Leave a comment

DRBD and Network Restarts

Using drbd as a simple and reliable alternative to distributed block devices is quite common. Especially in primary/primary mode, it provides the possibility to host block devices for virtual machines on two different hosts. However, there is one annoyance that … Continue reading

Posted in block devices, DRBD, Networking | Tagged | 1 Comment

Xen or KVM

Since little more than half a year, I am in the process of installing a new virtualization Platform. One of the hardest decisions to make was if we should use Xen or go with KVM. We already have Xen in … Continue reading

Posted in block devices, KVM, Networking, openSUSE, Xen | 1 Comment

Xen Networking with VLAN

When deploying virtual machines in network environments that are setup with several VLANs, it may be a good idea to provide the virtual Host with the necessary tagged VLANs. It is possible to untag the respective vlans in the controlling … Continue reading

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