dhcrelay does not forward BOOTREPLY
Mickaël Canévet
mickael.canevet at gmail.com
Thu Jan 31 17:58:29 UTC 2013
Hello,
I have some troubles to make my dhcp relay working.
I launch dhcrelay with:
/usr/sbin/dhcrelay -d -i eth0 -i eth0.2 192.168.2.254
I can see the boot requests forwarded:
Forwarded BOOTREQUEST for 00:26:9e:xx:xx:xx to 192.168.2.254
but no BOOTREPLY forwarded.
With dhcpdump on eth0.2 (the interface connected to the client) I can see
the BOOTREQUEST:
TIME: 2013-01-30 17:54:14.108
IP: 0.0.0.0 (0:26:9e:xx:xx:xx) > 255.255.255.255 (ff:ff:ff:ff:ff:ff)
OP: 1 (BOOTPREQUEST)
HTYPE: 1 (Ethernet)
HLEN: 6
HOPS: 0
XID: 9505ab35
SECS: 2816
FLAGS: 0
CIADDR: 0.0.0.0
YIADDR: 0.0.0.0
SIADDR: 0.0.0.0
GIADDR: 0.0.0.0
CHADDR: 00:26:9e:xx:xx:xx:00:00:00:00:00:00:00:00:00:00
SNAME: .
FNAME: .
OPTION: 53 ( 1) DHCP message type 1 (DHCPDISCOVER)
OPTION: 61 ( 7) Client-identifier 01:00:26:9e:xx:xx:xx
OPTION: 12 ( 7) Host name mypc
OPTION: 60 ( 8) Vendor class identifier MSFT 5.0
OPTION: 55 ( 12) Parameter Request List 1 (Subnet mask)
15 (Domainname)
3 (Routers)
6 (DNS server)
44 (NetBIOS name server)
46 (NetBIOS node type)
47 (NetBIOS scope)
31 (Perform router discovery)
33 (Static route)
121 (Classless Static Route)
249 (MSFT - Classless route)
43 (Vendor specific info)
And on eth0 (the interface connected to the DHCP server) both the request
and the reply:
TIME: 2013-01-30 17:55:54.872
IP: 192.168.2.11 (b8:27:eb:xx:xx:xx) > 192.168.2.254 (f4:ca:e5:xx:xx:xx)
OP: 1 (BOOTPREQUEST)
HTYPE: 1 (Ethernet)
HLEN: 6
HOPS: 1
XID: 221fce9e
SECS: 0
FLAGS: 0
CIADDR: 0.0.0.0
YIADDR: 0.0.0.0
SIADDR: 0.0.0.0
GIADDR: 192.168.2.11
CHADDR: 00:26:9e:xx:xx:xx:00:00:00:00:00:00:00:00:00:00
SNAME: .
FNAME: .
OPTION: 53 ( 1) DHCP message type 1 (DHCPDISCOVER)
OPTION: 61 ( 7) Client-identifier 01:00:26:9e:xx:xx:xx
OPTION: 12 ( 7) Host name mypc
OPTION: 60 ( 8) Vendor class identifier MSFT 5.0
OPTION: 55 ( 12) Parameter Request List 1 (Subnet mask)
15 (Domainname)
3 (Routers)
6 (DNS server)
44 (NetBIOS name server)
46 (NetBIOS node type)
47 (NetBIOS scope)
31 (Perform router discovery)
33 (Static route)
121 (Classless Static Route)
249 (MSFT - Classless route)
43 (Vendor specific info)
OPTION: 82 ( 6) Relay Agent Information
Circuit-ID 65:74:68:30
---------------------------------------------------------------------------
TIME: 2013-01-30 17:55:54.884
IP: 192.168.2.254 (f4:ca:e5:xx:xx:xx) > 192.168.2.11 (b8:27:eb:xx:xx:xx)
OP: 2 (BOOTPREPLY)
HTYPE: 1 (Ethernet)
HLEN: 6
HOPS: 0
XID: 221fce9e
SECS: 0
FLAGS: 0
CIADDR: 0.0.0.0
YIADDR: 192.168.2.15
SIADDR: 0.0.0.0
GIADDR: 0.0.0.0
CHADDR: 00:26:9e:xx:xx:xx:00:00:00:00:00:00:00:00:00:00
SNAME: .
FNAME: .
OPTION: 53 ( 1) DHCP message type 2 (DHCPOFFER)
OPTION: 54 ( 4) Server identifier 192.168.2.254
OPTION: 51 ( 4) IP address leasetime 43200 (12h)
OPTION: 1 ( 4) Subnet mask 255.255.255.0
OPTION: 3 ( 4) Routers 192.168.2.254
OPTION: 6 ( 4) DNS server 192.168.2.254
Does anybody have an idea why my ISC DHCP Relay does not forward BOOTREPLY ?
Thanks a lot.
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