Hi,
I''m setting up a router (linux, debian-sarge), which shall relay dhcp
requests
from all subnets to a central DHCP server. The general stuff is solved, i.e.
I can ping from any connected machine to any other including the NICs of the
router itself. All firewall tables (including nat and mangle) are set to
ACCEPT and flushed.
On my model system I have the NIC 172.16.1.121 (eth1), which is surtur and
also connects to adept the DHCP (172.16.1.7). This net (172.16.1.0) shall be
connected to 172.16.2.0 using the other NIC 172.16.2.1 (eth0, not in DNS).
Attached to it is my WLAN access point (ymir, 172.16.2.12). And this is what
happens:
#> dhcrelay -i eth0 adept.mgr
#> tcpdump -i any port bootpc or port bootps
09:42:09.996479 172.16.1.12.bootpc > 255.255.255.255.bootps: xid:0x960f0000
flags:0x8000 [|bootp]
09:42:09.997009 surtur.mgr.bootps > adept.mgr.bootps: (request)
xid:0x960f0000
flags:0x8000 G:172.16.2.1 ether 0:9:5b:68:19:fb [|bootp] (DF)
09:42:09.997603 adept.mgr.bootps > 172.16.2.1.bootps: (reply) xid:0x960f0000
flags:0x8000 Y:ymir.mgr S:adept.mgr G:172.16.2.1 ether 0:9:5b:68:19:fb [|
bootp] (DF)
... but somethink like the following never appears (line taken from DHCP
exchange from server installed on router):
09:59:38.780364 172.16.2.1.bootps > 255.255.255.255.bootpc: xid:0x960f0000
flags:0x8000 Y:ymir.mgr S:172.16.2.1 [|bootp] [tos 0x10]
Therefore, ymir never gets his IP!
Any help appreciated,
- lars.
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