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Dealing with multiple IP addresses
While you could use 6 interfaces, one per IP, it would be easier to use IP aliasing to
add multiple IP addresses to a single interface.
*Link: How do I add interface aliases using Network Manager GUI?

dnsmasq config:
-Change the IP to your server's

address=/lancache-steam/192.168.1.100  
address=/.cs.steampowered.com/192.168.1.100  
address=/cs.steampowered.com/192.168.1.100  
address=/content1.steampowered.com/192.168.1.100  
address=/content2.steampowered.com/192.168.1.100  
address=/content3.steampowered.com/192.168.1.100  
address=/content4.steampowered.com/192.168.1.100  
address=/content5.steampowered.com/192.168.1.100  
address=/content6.steampowered.com/192.168.1.100  
address=/content7.steampowered.com/192.168.1.100  
address=/content8.steampowered.com/192.168.1.100  
address=/.hsar.steampowered.com.edgesuite.net /192.168.1.100  
address=/clientconfig.akamai.steamstatic.com/192.168.1.100    
address=/lancache-riot/192.168.1.101  
address=/l3cdn.riotgames.com/192.168.1.101  
address=/lancache-blizzard/192.168.1.102  
address=/dist.blizzard.com.edgesuite.net/192.168.1.102  
address=/llnw.blizzard.com/192.168.1.102  
address=/dist.blizzard.com/192.168.1.102  
address=/lancache-hirez/192.168.1.103  
address=/hirez.http.internapcdn.net/192.168.1.103  
address=/lancache-origin/192.168.1.104  
address=/akamai.cdn.ea.com/192.168.1.104  
address=/lancache-sony/192.168.1.105  
address=/pls.patch.station.sony.com/192.168.1.105  
address=/lancache-gog/192.168.1.106  
address=/cdn.gog.com/192.168.1.106  
address=/wpc.11df.deltacdn.net/192.168.1.106  
address=/11df-eu-lb.wpc.edgecastcdn.net/192.168.1.106  
address=/11df-eu-lb.apr-11df.edgecastdns.net/192.168.1.106  

My Setup

• I am currently using Ubuntu 15.04 on a dual Xeon quad core CPU with 24GiB of memory.
• My filesystem is ZFS on Linux, where I use 6 250GB SSDs in raidz1.
• I use bonded dual 10G links to my switch.

Issues

• LoL caches just fine on the first download but subsequent downloads stall midway.