As with other classes of devices, Ersatz-11 uses a device-independent interface to attach any supported PC network interface type as the physical side of any supported PDP-11 network interface type. Each interface is created using a one-line ASSIGN command in the E11.INI initialization text file. E11 can optionally perform filtering based on Ethernet protocol numbers so that the PDP-11 operating system will not be swamped by broadcast traffic intended for other systems. Note that while real PDP-11 network interfaces were limited to 10 MBPS Ethernet, E11 will work with the newer high-speed Ethernet interfaces.

Physical PC network interfaces: (E11 for DOS)

• Any Ethernet interface with a packet driver
• NE2000 clones, ISA or PCI (built-in driver)
• RealTek RTL8139-based PCI 10/100 MBPS Ethernet cards

Physical PC network interfaces: (E11 for Win32)

• Any Ethernet (or Ethernet-like) interface supported by Windows

E11 needs the (free) WinPcap package to perform raw Ethernet I/O

Physical PC network interfaces: (E11 for Linux)

• Any Ethernet (or Ethernet-like) interface supported by Linux

E11's network driver requires version 2.2 or later of the Linux kernel

Emulated PDP-11 network interfaces:

dev name	controller types	description	E11 versions
NI:	Interlan NI1010A/NI2010A	Unibus/Q-bus Ethernet port	all
XE:/NU:	DEUNA, DELUA	Unibus Ethernet port	all
XH:/NQ:	DEQNA	Q-bus Ethernet port	all (as of V3.1)