Documentation/networking/decnet.rst

1 .. SPDX-License-Identifier: GPL-2.0
10    - Project Home Pages
11      - http://www.chygwyn.com/				   - Kernel info
12      - http://linux-decnet.sourceforge.net/                - Userland tools
13      - http://www.sourceforge.net/projects/linux-decnet/   - Status page
20     - CONFIG_DECNET (obviously)
21     - CONFIG_PROC_FS (to see what's going on)
22     - CONFIG_SYSCTL (for easy configuration)
27     - CONFIG_DECNET_ROUTER (to be able to add/delete routes)
28     - CONFIG_NETFILTER (will be required for the DECnet routing daemon)
37  - Set the MAC address on your ethernet card before starting _any_ other
42 to set the MAC address, see the next section. Also all configurations which
48 You can set a DECnet address on the kernel command line for compatibility
50 If you do st a DECnet address on the command line, it has only one purpose
53 With 2.4 kernels, DECnet would only recognise addresses as local if they
54 were added to the loopback device. In 2.5, any local interface address
55 can be used to loop back to the local machine. Of course this does not
59 N.B. Since the address list of an interface determines the addresses for
60 which "hello" messages are sent, if you don't set an address on the loopback
61 interface then you won't see any entries in /proc/net/neigh for the local
63 operation of the local communications in any other way though.
69 the two numbers are the node address 1,2 = 1.2 For 2.2.xx kernels
71 DECnet address like this. For more recent 2.3.xx kernels, you may
73 obvious choice :-)
80 There are also equivalent options for modules. The node address can
85 ethernet address of your ethernet card has to be set according to the DECnet
86 address of the node in order for it to be autoconfigured (and then appear in
89 address to use. The address can be set by ifconfig either before or
95 or something similar, to /etc/sysconfig/network-scripts/ifcfg-eth0 or
96 wherever your network card's configuration lives. Setting the MAC address
97 of your ethernet card to an address starting with "hi-ord" will cause a
98 DECnet address which matches to be added to the interface (which you can
106     echo -n "eth0" >/proc/sys/net/decnet/default_device
145    - Is the node address set (see /proc/sys/net/decnet/node_address)
146    - Is the node of the correct type
148    - Is the Ethernet MAC address of each Ethernet card set to match
149      the DECnet address. If in doubt use the dn2ethaddr utility available
151    - If the previous two steps are satisfied, and the Ethernet card is up,
156    - If you have any DECnet routers on your network, they should appear
159    - If you want to send to any node which is not listed in the
163    - Try starting a simple server and client, like the dnping/dnmirror
168    - If this seems to work, then try talking to a node on your local
170    - At this point you are on your own... :-)
179  - What kernel version are you running ?
180  - What version of the patch are you running ?
181  - How far though the above set of tests can you get ?
182  - What is in the /proc/decnet* files and /proc/sys/net/decnet/* files ?
183  - Which services are you running ?
184  - Which client caused the problem ?
185  - How much data was being transferred ?
186  - Was the network congested ?
187  - How can the problem be reproduced ?
188  - Can you use tcpdump to get a trace ? (N.B. Most (all?) versions of
190    the hex listing of the packet contents is _essential_, usually the -x flag.
191    You may also need to increase the length grabbed with the -s flag. The
192    -e flag also provides very useful information (ethernet MAC addresses))
194 7. MAC FAQ
197 A quick FAQ on ethernet MAC addresses to explain how Linux and DECnet
201 to a host computer when they are addressed to it, or to the broadcast address.
213 built in MAC address of the card, as usual) and/or to allow multiple DECnet
215 ethernet card doesn't support perfect hashing in its MAC address filter
219 cards its better to set the MAC address of the card as described above