Re: Is it possible, bind has done but the OS still respond with ICMP destination unreachable



I encounter a problem seems strange. I ran ser(a open source SIP
server) which binds to the port 5060. After the system starting up, I
can see aparently that the ser has successfully bind to UDP 5060.

You shouldn't be saying "apparently". Run netstat -ltu and see what it
*has* bound to.
.