func (p *InstancePortTable) nextHost(host net.IP, from port.Port) port.HostPort {
key := port.HostPort{host.String(), from}
for {
if _, ok := p.reserved[key]; !ok {
p.reserved[key] = true
return key
}
last := len(host) - 1
host[last]++
if host[last] == 255 {
host[last-1]++
host[last] = 1
}
key.Host = host.String()
}
panic("Unable to locate a valid host")
}
