[syslinux] PXE multihomed Interface for multiple subnets

[Jason Gerfen]

I am attempting to setup a PXE boot server listening on different 
subnets and have spent a couple of days scouring forums trying to find 
an anser. Below is a brief synopsis of the topology. I could really use 
some help with this if at all possible.

Client -> Subnet-29 -> Server-1
Client -> Subnet-151 -> Server-1

Here is the current DHCPD.CONF

### GLOBAL DHCP CONFIGURATION ###

option domain-name="tyr";
default-lease-time 900;
max-lease-time 1800;
ddns-update-style none;
authoritative; allow bootp;
allow booting;
option space PXE;
option PXE.mtftp-ip code 1 = ip-address;
option PXE.mtftp-cport code 2 = unsigned integer 16;
option PXE.mtftp-sport code 3 = unsigned integer 16;
option PXE.mtftp-tmout code 4 = unsigned integer 8;
option PXE.mtftp-tmout code 4 = unsigned integer 8;

 ### SUBNETS CONFIGURATION ###

# Vlan-029
subnet 192.168.1.0
netmask 255.255.255.0 {
 option domain-name-servers 192.168.1.10, 192.168.1.11;
 option routers 192.168.1.1;
}
# Vlan-151
subnet 192.168.0.0
netmask 255.255.255.0 {
 option domain-name-servers 192.168.0.10, 192.168.0.11;
 option routers 192.168.0.1;
}

### PXE GROUPS CONFIGURATION ###

# MMC-PXE group
group {
 next-server 192.168.1.254;
 filename "/tftproot/pxelinux.0";
 host MMPC-57 {
  hardware ethernet 00:02:B3:A3:06:7c;
  fixed-address 192.168.1.101;
 }
 host MMPC-110 {
  hardware ethernet 00:02:B3:EB:08:43;
  fixed-address 192.168.1.102;
 }
}
# UN-PXE group
group {
 next-server 192.168.0.254;
 filename "/tftproot/pxelinux.0";
 host unsc-01 {
  hardware ethernet 00:02:B3:63:c6:b5;
  fixed-address 192.168.0.101;
 }
 host unpc-92 {
  hardware ethernet 00:02:B3:D2:06:1B;
  fixed-address 192.168.0.102;
 }
}

When I sniff the packets on the client and server this is the output I 
am recieving:

13:26:05.381080 mmpc-98.32823 > tyr.tftp: 22 RRQ "pxelinux.0" (DF)
13:26:05.381105 tyr > mmpc-98: icmp: tyr udp port tftp unreachable [tos 
0xc0]

And the output of the current listening services on the server:

jason at tyr:~$ netstat -an | grep udp
udp 0 0 0.0.0.0:67 0.0.0.0:*
udp 0 0 0.0.0.0:67 0.0.0.0:*
udp 0 0 0.0.0.0:69 0.0.0.0:*

And the current ifconfig output:
eth2.29 Link encap:Ethernet HWaddr 00:02:B3:BC:46:88
               inet addr:192.168.0.254 Bcast:192.168.0.255 
Mask:255.255.255.0 UP BROADCAST
               RUNNING MULTICAST MTU:1500 Metric:1 RX packets:65644
               errors:0 dropped:0 overruns:0 frame:0 TX packets:167395
               errors:0 dropped:0 overruns:0 carrier:0 collisions:0 
txqueuelen:0 RX bytes:7195714 (6.8 Mb) TX bytes:17110387 (16.3 Mb)

eth2.151 Link encap:Ethernet HWaddr 00:02:B3:BC:46:88 inet 
addr:192.168.1.254 Bcast:192.168.1.255 Mask:255.255.255.0 UP BROADCAST 
RUNNING MULTICAST MTU:1500 Metric:1 RX packets:72591 errors:0 dropped:0 
overruns:0 frame:0 TX packets:138170 errors:0 dropped:0 overruns:0 
carrier:0 collisions:0 txqueuelen:0 RX bytes:6934628 (6.6 Mb) TX 
bytes:14440655 (13.7 Mb) Am I missing something? Any help, pointers, 
tips, tutorials etc. are appreciated.
-- Jas