I am running lwip version 1.41 on a Linux server(red hat release 6.4). I am
using the socket API and attempting to listen to multicast packets that a test
client running on the same linux server is sending. I have successfully send
unicast packets using this setup on the tap0 device. However, when my
listener tries to join a multicast group, I see the IGMP v2 report packets
going out and the igmp_joingroup call returns without an error code but I don't
join the multicast group(I have confirmed this with a netstat -g). It appears
that I have done all the setup successfully so I am stumped. Any ideas as to
what I might be doing wrong?
As a side question, I was wondering why the system command ifconfig(in file
tapif.c) used to configure the tap0 device uses the gateway instead of the IP:
netif: IP address of interface set to 192.168.1.2
netif: netmask of interface set to 255.255.255.0
netif: GW address of interface set to 192.168.1.1
tapif_init: system("/sbin/ifconfig tap0 inet 192.168.1.1")
tap0 Link encap:Ethernet HWaddr 12:48:BE:27:92:1E
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Thanks in advance for any help,
Stefan
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