Date: Mon, 5 Sep 2005 23:46:41 +0200 From: Ihsan Dogan <ihsan@dogan.ch> To: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: dhcrelay is setting the relay ip address wrong Message-ID: <20050905214641.GA28018@dogan.ch>
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Hello,
I'm running a small router/firewall on a FreeBSD 5.4 system. This
machine should also act as a DHCP gateway. For the dhcp relay,
I'm using ISC's dhcrelay (from Ports isc-dhcp3-relay-3.0.3).
The Interfaca and network configuration:
hme0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=b<RXCSUM,TXCSUM,VLAN_MTU>
inet 213.144.141.145 netmask 0xfffffff8 broadcast 213.144.141.151
inet6 fe80::a00:20ff:feb4:42cc%hme0 prefixlen 64 scopeid 0x1
inet6 2001:470:1f01:569::1 prefixlen 112
ether 08:00:20:b4:42:cc
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
hme1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=b<RXCSUM,TXCSUM,VLAN_MTU>
inet 192.168.23.1 netmask 0xffffff00 broadcast 192.168.23.255
inet6 fe80::a00:20ff:feb4:42cd%hme1 prefixlen 64 scopeid 0x2
ether 08:00:20:b4:42:cd
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
hme2: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=b<RXCSUM,TXCSUM,VLAN_MTU>
inet 192.168.42.1 netmask 0xffffff00 broadcast 192.168.42.255
inet6 fe80::a00:20ff:feb4:42ce%hme2 prefixlen 64 scopeid 0x3
ether 08:00:20:b4:42:ce
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
The DHCP server is on the subnet of hme0; the DHCP clients are on
hme1 on hme2.
netstat -rnf inet:
Destination Gateway Flags Refs Use Netif Expire
default 213.144.128.205 UGS 0 250630 tun0
127.0.0.1 127.0.0.1 UH 0 71 lo0
192.168.23 link#2 UC 0 0 hme1
192.168.23.2 00:c0:49:5a:1d:ca UHLW 0 2 hme1 823
192.168.42 link#3 UC 0 0 hme2
213.144.128.205 213.144.146.12 UH 1 0 tun0
213.144.141.144 ff:ff:ff:ff:ff:ff UHLWb 0 3 hme0 =>
213.144.141.144/29 link#1 UC 0 0 hme0
213.144.141.146 00:08:c7:3a:df:a9 UHLW 0 104123 hme0 233
213.144.141.147 00:07:e9:14:1a:a1 UHLW 0 38011 hme0 322
213.144.141.151 ff:ff:ff:ff:ff:ff UHLWb 0 1 hme0
The dhcrelay is started with the following options:
/usr/local/sbin/dhcrelay -i hme1 -i hme2 -d -a 213.144.141.146
The dhcrelay receives the request and passes them to the DHCP
server, but the forwarded package contains the "relay agent ip
address" of 192.168.23.1 and not 213.144.141.145 how it should
be. In that case, the DHCP server is sending the reply to
192.168.23.1 and not to 213.144.141.145.
Did I something wrong? A bug?
Ihsan
--
ihsan@dogan.ch http://ihsan.dogan.ch/
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