[LARTC] Proxy-ARP

From: "S Mohan" <smohan@vsnl.com>
To: lartc@vger.kernel.org
Subject: [LARTC] Proxy-ARP
Date: Sun, 17 Nov 2002 14:11:18 +0000	[thread overview]
Message-ID: <marc-lartc-103759486813907@msgid-missing> (raw)

I'm working with LEAF boxes as gateway machines. I'm trying to implement
Proxy-ARP to build a bandwidth manager for my network. I've gone as per
the lartc howto to implement a transparent bridge in an existing network
and plan to put in my tc script after this. I'm configuring the box as a
standalone one before plugging it into the network. I'm getting an error
when I try to delete a route for local LAN addresses thro' the external
interface in order to put in a specific one to route only packets meant
for the router's interface thro' that ethernet interface on the LEAF
box. The kernel version is 2.4.18 patched with htb and ipsec. Iproute2
is also installed.

My intended network goes as below. I put up a LEAF box to try this. LAN
Config is as under

                         10.0.1.1
  Internet   +-----------------+      eth0+-----------+eth1      |
======> | Router/ VPN Box |----------|LEAF Bering|----------| LAN
  Leased     +-----------------+  10.0.1.4+-----------+10.0.1.4  |
10.0.1.x

I set up interfaces file and checked all the settings. I'm unable to
delete the route for eth0 for 10.0.1.x addresses. I'm giving below the
transcript. I'm not able to figure out what the problem is. Can you help
me put this up please?

<transcript>
#ip li sh
1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: dummy0: <BROADCAST,NOARP> mtu 1500 qdisc noop 
    link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
3: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 100
    link/ether 00:00:21:f3:0a:4f brd ff:ff:ff:ff:ff:ff
4: eth1: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 100
    link/ether 00:00:21:f4:50:e7 brd ff:ff:ff:ff:ff:ff

#ip addr sh
1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 brd 127.255.255.255 scope host lo
2: dummy0: <BROADCAST,NOARP> mtu 1500 qdisc noop 
    link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
3: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 100
    link/ether 00:00:21:f3:0a:4f brd ff:ff:ff:ff:ff:ff
    inet 10.0.1.4/24 brd 10.0.1.255 scope global eth0
4: eth1: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 100
    link/ether 00:00:21:f4:50:e7 brd ff:ff:ff:ff:ff:ff
    inet 10.0.1.4/24 brd 10.0.1.255 scope global eth1

#ip ro sh
10.0.1.0/24 dev eth0  proto kernel  scope link  src 10.0.1.4 
10.0.1.0/24 dev eth1  proto kernel  scope link  src 10.0.1.4 
default via 10.0.1.1 dev eth0

#cat /proc/sys/net/ipv4/conf/eth1/proxy_arp
1

#cat /proc/sys/net/ipv4/conf/eth0/proxy_arp
1

#ip ro del 10.0.1.0/24 via 10.0.1.4 dev eth0
RTNETLINK answers: No such process

#ip ro add 10.0.1.1/24 via 10.0.1.4 dev eth0
#ip ro sh
10.0.1.1 via 10.0.1.4 dev eth0 
10.0.1.0/24 dev eth0  proto kernel  scope link  src 10.0.1.4 
10.0.1.0/24 dev eth1  proto kernel  scope link  src 10.0.1.4 
default via 10.0.1.1 dev eth0 
</transcript>

Since I'm going to be introducing this bridge into a production LAN, I'd
like this to work first shot. Any pointers please.

TIA
Mohan

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