I am using: Linux kernel version: 2.6.35.14-106.fc14.x86_64

IP multicasting packets are not being forwarded between eth0 & wlan0.

I understand that I need the following modules in the kernel:
CONFIG_IP_MULTICAST=y
CONFIG_IP_ROUTER=y
CONFIG_IP_MROUTE=y
CONFIG_NET_IPIP=y
These show as enabled in /boot/config<kernel-version>, except for IP_ROUTER which shows as IP_ADVANCED_ROUTER & NET_IPIP which shows as: CONFIG_NET_IPIP=m
I can load ipip with modprobe.

But I cannot confirm 100% that IP_MULTICAST is loaded

lsmod shows no modules referencing MULTICASTING:
]$ lsmod | grep -i ip
xt_multiport 2644 1
ipt_MASQUERADE 2353 1
iptable_nat 5018 1
nf_nat 20289 2 ipt_MASQUERADE,iptable_nat
iptable_mangle 1695 1
ip6t_REJECT 4263 2
nf_conntrack_ipv6 18078 2
ip6table_filter 1687 1
ip6_tables 17497 1 ip6table_filter
ipv6 286633 48 ip6t_REJECT,nf_conntrack_ipv6

Neither does modprobe.

Is there a sure way to find out?
Your help is greatly appreciated.

before messing around with a "End Of Life " version .
You might want to install the current and supported version FIRST

Fedora 16

only 15 and 16 are currently supported
and 15 hits EOL in 4 months


what is not working that you think you need those exact modules built

I set up a PC to route packets on eth0 - subnet 172.16.0.0 to wlan0 subnet 192.168.125.0 Device on eth0 get addresses via a DHCP server which listens on eth0. packets forwarded are NAT/Masquerade to the 192.168.125.0 subnet using the address of wlan0. This works. The PC has Mediatomb installed and the Media rendered i.e.TV, can play content from Meditomb. The TV discovers Media servers using UPnP multicast:
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
21:40:52.095126 IP 172.16.225.10.blackjack > 239.255.255.250.ssdp: UDP, length 302
21:40:52.116722 IP 172.16.225.10.blackjack > 239.255.255.250.ssdp: UDP, length 311


I cannot see the multicast packets on the wlan0 side.
Incidentally, I did try FC 16, but dhcpd did not recognize the eth0 port when i used DHCPARGS=p3p0 - which is the name for eth0 under FC 16. Other changes made me put off starting over the learning curve for FC 16.
I still would like to know how to be sure multicasting module is loaded & running in the kernel? or am I going about this the right way?