moby: 1.7.0/CentOS/RHEL 6.6 - bridge interface creation fails. daemon won't start.

Can’t provide docker info, since daemon won’t start.

# docker -D -d
DEBU[0000] Registering POST, /containers/{name:.*}/unpause 
DEBU[0000] Registering POST, /containers/{name:.*}/restart 
DEBU[0000] Registering POST, /exec/{name:.*}/resize     
DEBU[0000] Registering POST, /containers/create         
DEBU[0000] Registering POST, /containers/{name:.*}/kill 
DEBU[0000] Registering POST, /containers/{name:.*}/start 
DEBU[0000] Registering POST, /containers/{name:.*}/stop 
DEBU[0000] Registering POST, /containers/{name:.*}/resize 
DEBU[0000] Registering POST, /auth                      
DEBU[0000] Registering POST, /build                     
DEBU[0000] Registering POST, /containers/{name:.*}/wait 
DEBU[0000] Registering POST, /containers/{name:.*}/attach 
DEBU[0000] Registering POST, /containers/{name:.*}/copy 
DEBU[0000] Registering POST, /containers/{name:.*}/exec 
DEBU[0000] Registering POST, /exec/{name:.*}/start      
DEBU[0000] Registering POST, /commit                    
DEBU[0000] Registering POST, /images/create             
DEBU[0000] Registering POST, /images/load               
DEBU[0000] Registering POST, /images/{name:.*}/push     
DEBU[0000] Registering POST, /images/{name:.*}/tag      
DEBU[0000] Registering POST, /containers/{name:.*}/pause 
DEBU[0000] Registering POST, /containers/{name:.*}/rename 
DEBU[0000] Registering DELETE, /containers/{name:.*}    
DEBU[0000] Registering DELETE, /images/{name:.*}        
DEBU[0000] Registering OPTIONS,                         
DEBU[0000] Registering GET, /version                    
DEBU[0000] Registering GET, /containers/ps              
DEBU[0000] Registering GET, /containers/{name:.*}/changes 
DEBU[0000] Registering GET, /images/{name:.*}/history   
DEBU[0000] Registering GET, /containers/json            
DEBU[0000] Registering GET, /containers/{name:.*}/export 
DEBU[0000] Registering GET, /containers/{name:.*}/json  
DEBU[0000] Registering GET, /events                     
DEBU[0000] Registering GET, /images/search              
DEBU[0000] Registering GET, /images/get                 
DEBU[0000] Registering GET, /images/{name:.*}/get       
DEBU[0000] Registering GET, /exec/{id:.*}/json          
DEBU[0000] Registering GET, /info                       
DEBU[0000] Registering GET, /containers/{name:.*}/top   
DEBU[0000] Registering GET, /containers/{name:.*}/logs  
DEBU[0000] Registering GET, /containers/{name:.*}/stats 
DEBU[0000] Registering GET, /_ping                      
DEBU[0000] Registering GET, /images/json                
DEBU[0000] Registering GET, /images/{name:.*}/json      
DEBU[0000] Registering GET, /containers/{name:.*}/attach/ws 
WARN[0000] You are running linux kernel version 2.6.32-504.8.1.el6.x86_64, which might be unstable running docker. Please upgrade your kernel to 3.10.0. 
DEBU[0000] Warning: could not change group /var/run/docker.sock to docker: Group docker not found 
INFO[0000] Listening for HTTP on unix (/var/run/docker.sock) 
DEBU[0000] devicemapper: driver version is 4.27.0       
DEBU[0000] Generated prefix: docker-252:3-1311141       
DEBU[0000] Checking for existence of the pool 'docker-252:3-1311141-pool' 
DEBU[0000] Pool doesn't exist. Creating it.             
DEBU[0000] Error retrieving the next available loopback: open /dev/loop-control: no such file or directory 
DEBU[0000] Error retrieving the next available loopback: open /dev/loop-control: no such file or directory 
DEBU[0000] [deviceset] constructDeviceIdMap()           
DEBU[0000] Loading data for file /var/lib/docker/devicemapper/metadata/base 
DEBU[0000] Added deviceId=1 to DeviceIdMap              
DEBU[0000] Skipping file /var/lib/docker/devicemapper/metadata/deviceset-metadata 
DEBU[0000] Loading data for file /var/lib/docker/devicemapper/metadata/transaction-metadata 
DEBU[0000] Added deviceId=1 to DeviceIdMap              
DEBU[0000] [deviceset] constructDeviceIdMap() END       
INFO[0000] [graphdriver] using prior storage driver "devicemapper" 
DEBU[0000] Using graph driver devicemapper              
DEBU[0000] Using default logging driver json-file       
DEBU[0000] Creating images graph                        
DEBU[0000] Restored 0 elements                          
DEBU[0000] Creating repository list                     
WARN[0000] Running modprobe bridge nf_nat failed with message: , error: exit status 1 
DEBU[0000] /sbin/iptables, [-t nat -D PREROUTING -m addrtype --dst-type LOCAL -j DOCKER] 
DEBU[0000] /sbin/iptables, [-t nat -D OUTPUT -m addrtype --dst-type LOCAL ! --dst 127.0.0.0/8 -j DOCKER] 
DEBU[0000] /sbin/iptables, [-t nat -D OUTPUT -m addrtype --dst-type LOCAL -j DOCKER] 
DEBU[0000] /sbin/iptables, [-t nat -D PREROUTING]       
DEBU[0000] /sbin/iptables, [-t nat -D OUTPUT]           
DEBU[0000] /sbin/iptables, [-t nat -F DOCKER]           
DEBU[0000] /sbin/iptables, [-t nat -X DOCKER]           
DEBU[0000] [deviceset docker-252:3-1311141] Shutdown()  
DEBU[0000] [devmapper] Shutting down DeviceSet: /var/lib/docker/devicemapper 
DEBU[0000] [devmapper] deactivateDevice()               
DEBU[0000] [devmapper] deactivateDevice END()           
DEBU[0000] [devmapper] deactivatePool()                 
DEBU[0000] [devmapper] devicemapper.GetDeps() /dev/mapper/docker-252:3-1311141-pool: &devicemapper.Deps{Count:0x2, Filler:0x0, Device:[]uint64(nil)} 
DEBU[0000] [devmapper] deactivatePool END               
DEBU[0000] [deviceset docker-252:3-1311141] Shutdown() END 
FATA[0000] Error starting daemon: Error initializing network controller: Error creating default "bridge" network: operation not supported