Wireless Modem Router  
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Enter the certificate name. 
Paste the certificate content. 
Click Apply to apply your settings. 
4.2.17 Multicast 
Here you can configure the multicast feature. 
To configure IGMP for IPv4 
Check the LAN to LAN (Intra LAN) Multicast Enable box. 
Check the Membership Join Immediate (IPTV) box. This is only required for IPTV. 
Keep other options unchanged from factory defaults if you are not an advanced user. This is strongly recommended. 
 
To configure IGMP for IPv6 
Check the LAN to LAN (Intra LAN) Multicast Enable box. 
Keep other options unchanged from factory defaults if you are not an advanced user. This is strongly recommended.