Subject: NBP lookup problems with Linux
From: Andy Norman (ANorman@datamonitor.com)
Date: Tue Jul 01 1997 - 04:20:37 EDT
It seems that more people are running into this problem.
The symptoms of this problem are that you can't "see" Macs and printers
that are connected to a remote Linux AppleTalk router (by remote I mean a
router that you are not directly connected to).
The problem is with NBP lookups on remote zones (i.e. zones two routers
away). This prevents you from seeing devices on the other side of a Linux
AppleTalk router if there are two routers between you and the Macs you are
trying to see (the local router doesn't need to be a Linux one, only the
remote).
I am hoping the patch will be rolled into 2.0.31
The basic problem is that the Linux kernel code wasn't correctly converting
the NBP lookup packets into NBP broadcast requests before passing them onto
the target network.
I think this description is mostly right, I sure Mike will let us know if
it isn't.
Mike Freeman and Alan Cox came up with this correct patch after I
identified the problem and created my own ugly hack.
If you need the patch here it is. This probably won't patch cleanly in this
form (word et al), but it is very easy to apply by hand):
25a26
> * Alan Cox/Mike Freeman/Andy Norman : Possible fix to NBP
>problems
155c156,157
< ||to->sat_addr.s_node == ATADDR_BCAST ))
--- > ||to->sat_addr.s_node == ATADDR_BCAST > ||to->sat_addr.s_node == ATADDR_ANYNODE )) 512,513c514,517 < if((node==ATADDR_BCAST || iface->address.s_node==node) < && iface->address.s_net==net && !(iface->status&ATIF_PROBE)) --- > if((node==ATADDR_BCAST || node==ATADDR_ANYNODE > || iface->address.s_node==node) > && iface->address.s_net==net > && !(iface->status&ATIF_PROBE))-- Andy Norman Datamonitor Group IT Co-ordinator ANorman@datamonitor.com andy@focus.demon.co.uk http://www.datamonitor.com Tel: 0171 316 0792 Mobile: 0966 148131 Fax: 0171 316 0002
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