Date: Tue, 24 Aug 1999 17:19:47 +0200 (MET DST) From: Christian Wolf <Christian.Wolf@medis.de> To: Christoph Kukulies <kuku@gilberto.physik.RWTH-Aachen.DE> Cc: Hellmuth Michaelis <hm@hcs.de>, ISDN Mailinglist <freebsd-isdn@FreeBSD.ORG> Subject: Routing (was: isic0 not found at 0x340) Message-ID: <Pine.GSO.3.96.990824165526.15325A-100000@sun-chris.medis.de> In-Reply-To: <19990824152855.A51258@gil.physik.rwth-aachen.de>
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On Tue, 24 Aug 1999, Christoph Kukulies wrote:
> On Tue, Aug 24, 1999 at 01:51:55PM +0200, Hellmuth Michaelis wrote:
> > If i remember correctly, a packet is only routed to a destination in case
> > the destination is in a different network.
>
> Hhmm.
> <scratching head>
Normaly a packet is routed to an interface if the destination is in the
*same* network, because this is what the ifconfig command adds to the
routing table. I assume this is, what Helle wanted to say ;-).
On a point-to-point interface the netmask should not matter, because
ifconfig adds only a host-route. On an broadcast or point-to-multipoint
interface a network-route is added to the routing table.
This is the setup on one of our routers which works well on FreeBSD
3.1-RELEASE with i4b-00.83.00-beta-300799:
/etc/rc.conf looks like this:
------------------------------------- 8< -------------------------------------
network_interfaces="ed0 ipr0 ipr1 ipr2 ipr3 lo0"
ifconfig_ed0="inet 193.141.96.42 netmask 255.255.255.224"
defaultrouter="193.141.96.47"
hostname="bsdgate.medis.de"
keymap="german.iso"
ifconfig_ipr0="inet 193.141.96.42 193.141.96.1 link1"
ifconfig_ipr1="inet 193.141.96.42 193.141.96.2 link1"
ifconfig_ipr2="inet 193.141.96.42 193.141.96.3 link1"
ifconfig_ipr3="inet 193.141.96.42 193.141.96.4 link1"
gateway_enable="YES"
sendmail_enable="NO"
isdn_enable="YES"
isdn_fsdev="NO"
isdn_flags="-dn -d0x1f9" # Flags for isdnd
isdn_trace="NO" # Enable the ISDN trace subsystem (or NO).
isdn_traceflags="-f /var/tmp/isdntrace0" # Flags for isdntrace
------------------------------------- >8 -------------------------------------
this results in:
------------------------------------- 8< -------------------------------------
$ ifconfig -au
ed0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet 193.141.96.42 netmask 0xffffffe0 broadcast 193.141.96.63
ether 00:00:c0:87:f5:ae
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
inet 127.0.0.1 netmask 0xff000000
ipr0: flags=2811<UP,POINTOPOINT,SIMPLEX,LINK1> mtu 1500
inet 193.141.96.42 --> 193.141.96.1 netmask 0xffffff00
ipr1: flags=2811<UP,POINTOPOINT,SIMPLEX,LINK1> mtu 1500
inet 193.141.96.42 --> 193.141.96.2 netmask 0xffffff00
ipr2: flags=2811<UP,POINTOPOINT,SIMPLEX,LINK1> mtu 1500
inet 193.141.96.42 --> 193.141.96.3 netmask 0xffffff00
ipr3: flags=2811<UP,POINTOPOINT,SIMPLEX,LINK1> mtu 1500
inet 193.141.96.42 --> 193.141.96.4 netmask 0xffffff00
$ netstat -rn
Routing tables
Internet:
Destination Gateway Flags Refs Use Netif Expire
default 193.141.96.47 UGSc 0 191 ed0
127.0.0.1 127.0.0.1 UH 0 13 lo0
193.141.96.1 193.141.96.42 UH 1 41427 ipr0
193.141.96.2 193.141.96.42 UH 0 0 ipr1
193.141.96.3 193.141.96.42 UH 0 230 ipr2
193.141.96.4 193.141.96.42 UH 0 0 ipr3
193.141.96.32/27 link#1 UC 0 0 ed0
193.141.96.33 8:0:20:18:af:93 UHLW 2 8250 ed0 930
193.141.96.36 8:0:20:81:9a:e1 UHLW 4 33530 ed0 1181
193.141.96.47 link#1 UHLW 1 0 ed0
------------------------------------- >8 -------------------------------------
Regards,
Chris
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