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From: brian@shift.utell.net (Brian Somers)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: PPP and broadcast forwarding
Date: 26 Jun 1997 13:56:19 GMT
Organization: Awfulhak Ltd.
Lines: 52
Message-ID: <5otse3$dlh@ui-gate.utell.co.uk>
References: <slrn5r2msh.6ap.Alain.Thivillon@azuret.alma.fr>
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In article <slrn5r2msh.6ap.Alain.Thivillon@azuret.alma.fr>,
Alain.Thivillon@alma.fr (Alain Thivillon) writes:
>
> Hello,
>
> I use kernel mode pppd to serve remote users using Win95, Macs and WiNNT
> computers. Everything is OK (i use mgetty in AutoDetect PPP mode). pppd
> is in proxy arp mode (I assign an address in Lan range to dialup users).
>
> Of course net.inet.ip.forwarding is set to 1 (ie FreeBSD forward
> paquets).
>
> The only small problem i have is that Win* computers broadcast UDP
> paquets to x.y.z.255 (x.y.z is the Lan Class C address) to find master
> browser of Windows networking, and eventually NetBios Names (if i don't
> use Wins).
>
> It seems that FreeBSD does not forward broadcasts to the Lan : is there a
> way to change this ?
Nope. Forwarding broadcasts would be a disaster. Think about it.
The 'net would fill up with broadcast packets in minutes, and they'd
go 'round & 'round & 'round.
> I'm not sure if this is an IP problem or only a PPP problem, i try to
> take a look on kernel source, but ... :)
>
> I use FreeBSD 2.2.1.
>
> When someone is connected, i have these routing tables :
> (ppp-priv-03.alma.fr is the remote user ip name, 194.2.236 is the LAN
> network, de0 is the Ethernet interface, valerian.alma.fr is the server
> hostname):
>
> Destination Gateway Flags Refs Use Netif Expire
> default inet-gw.alma.fr UGSc 59 155281 de0
> localhost localhost UH 11 8400 lo0
> 194.2.236 link#1 UC 0 0
> [...]
> ppp-priv-03.alma.f valerian.alma.fr UH 2 147 ppp0
> ppp-priv-03.alma.f 0:0:c0:eb:29:cf UHLS2 0 0 de0
> [...]
> 194.2.236.255 ff:ff:ff:ff:ff:ff UHLWb 3 39648 de0
I always understood proxy-arp to mean arp forwarding, but perhaps
it means broadcast forwarding too ? Can anyone enlighten/point
me ?
--
Brian <brian@awfulhak.org> <brian@freebsd.org>
<http://www.awfulhak.org>
Don't _EVER_ lose your sense of humour !