I think you need use -ip parameter when your server machine have two (or more) network adapter enabled. To prevent srcds to choose wrong adapter.
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Usually don't need set -ip parameter at all when have one adapter, srcds will find it automatically.
This is my wild guess and what I quick googled
*edit
Used for internal IP, LAN IP.
!Use +ip
-ip localhost default value, get automatically internal IP
-ip 0.0.0.0 wildcard, listen all addresses
-ip 127.0.0.1 same as
-ip loopback
https://superuser.com/questions/9494...=votes#tab-top
*edit
you can also try commands which can kick players out server or timing out.
net_status Shows current network status
net_channels Shows net channel info, connected players etc.
if you change
ip value, activate with
net_start
and maybe map change
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