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Number of needed network adapter drivers.
If you use the router with ISDN, you typically have one network adapter only, hence the default value is 1. However, if you use DSL, you will have two network adapters in the majority of cases.
You have to separate two cases:
This variable contains the name of the driver to be used for the network adapter. The default for NET_DRV_1 is to load the driver for a NE2000 compatible network adapter. More available drivers for a large amount of families of network adapters are included in the tables 3.3 and 3.4.
The 3COM EtherLinkIII network adapter (3c509) has to be configured by the DOS tool 3c509cfg.exe, available under:
ftp://ftp.ihg.uni-duisburg.de/Hardware/3com/3C5x9n/3C5X9CFG.EXE
It should be used for setting the IRQ and I/O port and, if necessary, the type of connection (BNC/TP). The entry NET_DRV_x_OPTION='' can normally be left empty.
Some ISA adapters require the driver to have additional information in order to find the adapter, e.g. the I/O address. This is the case e.g. for NE2000 compatible ISA adapters and the EtherExpress16.
In such a case, you can set
NET_DRV_x_OPTION='io=0x340'
(or the corresponding numerical value).
If no options are required, you can leave this variable empty.
If you need to specify more than one option, you have to separate them by blanks, e.g.
NET_DRV_x_OPTION='irq=9 io=0x340'
If you use two identical network adapters, e.g. NE2000 ISA adapters, you have to separate the different I/O ports by commas:
NET_DRV_x_OPTION='io=0x240,0x300'
No space is allowed before or after the comma!
This does not work with all network adapter drivers. Some of them need to be loaded twice, i.e. you have to use NET_DRV_N='2'. In this case you will have to assign different names to the adapters by using the ``-o'' option, e.g.
NET_DRV_N='2'
NET_DRV_1='3c503'
NET_DRV_1_OPTION='-o 3c503-0 io=0x280'
NET_DRV_2='3c503'
NET_DRV_2_OPTION='-o 3c503-1 io=0x300'
We recommend to try the ``comma'' method first before falling back to loading the driver multiple times.
Some more examples:
NET_DRV_1='ne'
NET_DRV_1_OPTION='io=0x340'
NET_DRV_1='3c509'
NET_DRV_1_OPTION=''
For this adapter, see also:
NET_DRV_1='ne'
NET_DRV_1_OPTION='io=0x320,0x340'
Here, you will often need to specify the IRQ values:
NET_DRV_1_OPTION='io=0x320,0x340 irq=3,5'
You should first try the configuration without specifying any IRQs and enter IRQs only if the network adapters are not found otherwise.
NET_DRV_1='ne2k-pci'
NET_DRV_1_OPTION=''
NET_DRV_1='ne'
NET_DRV_1_OPTION='io=0x340'
NET_DRV_2='ne2k-pci'
NET_DRV_2_OPTION=''
NET_DRV_1='wd'
NET_DRV_1_OPTION='io=0x270'
NET_DRV_2='ne2k'
NET_DRV_2_OPTION='io=0x240'
You can find complete lists of available drivers in the Table of available network adapter drivers and in the Table of available WLAN adapter drivers.
If you need a dummy device, use 'dummy' as your NET_DRV_x and
IP_NET_x_DEV='dummy<number>' as your device.