| Carl-Friedrich-Gauß-Fakultät | Informatik

IBR Netzwerk

Autor Frank Steinberg
Schlüsselworte network

The following tables show the VLANs and subnets that are currently used in the IBR network.

IP address spaces

  • IPv4 host configuration MUST be done via DHCP. Never use static address configuration!
  • IPv6 host configuration MUST be done via autoconf (preferably) or DHCP (alternatively). Never use static address configuration! 2001:638:602:1181::/64 ibr-core core services, hosts maintained only by IBR admins, ports and hosts located only in the IBR server room 2001:638:602:1185::/64 ibr-cip subnet of computer pools G40 and 359 2001:638:602:1183::/64 ibr-misc known client hosts, registered with LDAP ibr-misc known client hosts, registered with LDAP by MAC addresses, but using DHCP IPv4 address pool ibr-misc anonymous hosts, DHCP IPv4 address pool ibr-misc Georg's testbed hosts ibr-misc other registered hosts with fixed private IPv4 addresses ibr-misc cloud subnet maintained by DS group 2001:638:602:1182::/64 OpenVPN UDP clients, via 2001:638:602:1182::/64 OpenVPN TCP clients, via StudentCloud Subnet for Nico, on ibr-misc 2001:638:602:1f00::/56 subnets for "Praktikum Administration von Computernetzen", via and fe80::5072:19ff:fe57:fd3b ibr-san iSCSI SAN, isolated from all other subnets 2001:638:602:118f::/64 ibr-mgmt management subnet, IPMI, iDRAC, etc. management subnet for kvm proxy ibr-roce isolated 10G VLAN (configured as PFC group for RoCE) used by DS

If you consider to use a new IPv4 private subnet for your own work, please talk to Frank to get a unique and documented address prefix (e.g., 10.x.0.0/16).


To be prepared for cases in which VLANs may span multiple floors of our building or even a wider range, VLAN-IDs have to be unique. Therefore, the VLAN ID namespace is managed by the GITZ. The following table lists the VLAN which are currently assigned to IBR:

ibr-core 136 core services; attachments are restricted to the server room and to hosts which are maintained only by IBR admins
ibr-cip 137 pools (rooms G40 and 359)
ibr-lab 138 Lab VLAN (currently not is use, 2016-04)
ibr-misc 139 major VLAN to which any hosts may connect; almost all ports in IBR rooms are in this VLAN
ibr-mgmt 140 management VLAN (switches, BMCs, iDRACs)
ibr-roce 141 VLAN for RDMA over Converged Ethernet (RoCE) which is used by the DS group
ibr-ds 142 a VLAN to interconnect some servers of the DS group
ibr-san 143 a VLAN to interconnect iSCSI devices in room 104, 10G-only

IPv6 Routing

Don't worry, if you see multiple IPv6 default routes. As of 2017-02 we really have two routers: The Linux firewall and gateway router advertises itself with "low" priority, while the Mellanox switch/router advertises itself with "high" priority, because it is able to route much faster between the IBR subnets. Just in case, the Mellanox router fails, well behaved IPv6 clients should use the Linux router.

aktualisiert am 12.09.2017, 07:55 von Frank Steinberg