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Question about Socketshi,
is it possible to use a Socket (proto_udp) and recieve icmp messages ? what i want to do is, send a datagram to a remote host/port and check if the host replies with port_unreachable (i think icmp type 3). is this possible with a udp Socket and the RecieveFrom() method ?. another approach would be (at least thats what i think) to use a raw socket with proto_udp. is this a wrong way to go ? thanks Bernd schrieb:
> hi, Hi,> > is it possible to use a Socket (proto_udp) and recieve icmp messages ? > what i want to do is, send a datagram to a remote host/port and check if > the host replies with port_unreachable (i think icmp type 3). > is this possible with a udp Socket and the RecieveFrom() method ?. > another approach would be (at least thats what i think) to use a raw > socket with proto_udp. > is this a wrong way to go ? > > thanks hhmmm, I think ICMP messages are not sent through UDP. So, I'm not sure but I think its not possible to do that with a UDP Socket. Yours sincerely Andy Andy Schmidt schrieb:
Show quoteHide quote > Bernd schrieb: ok, thanks for your answer. and yes you are right, icmp is not sent> >> hi, >> >> is it possible to use a Socket (proto_udp) and recieve icmp messages ? >> what i want to do is, send a datagram to a remote host/port and check if >> the host replies with port_unreachable (i think icmp type 3). >> is this possible with a udp Socket and the RecieveFrom() method ?. >> another approach would be (at least thats what i think) to use a raw >> socket with proto_udp. >> is this a wrong way to go ? >> >> thanks > > > Hi, > > hhmmm, I think ICMP messages are not sent through UDP. So, I'm not sure > but I think its not possible to do that with a UDP Socket. > > Yours sincerely > > Andy through udp. would it be possible to work with 2 sockets ? lets say i create an udp socket, send a dgram and recieve the reply with a raw socket proto_type_icmp ? thanks Bernd schrieb:
Show quoteHide quote > Hi,> > Andy Schmidt schrieb: > >>Bernd schrieb: >> >> >>>hi, >>> >>>is it possible to use a Socket (proto_udp) and recieve icmp messages ? >>>what i want to do is, send a datagram to a remote host/port and check if >>>the host replies with port_unreachable (i think icmp type 3). >>>is this possible with a udp Socket and the RecieveFrom() method ?. >>>another approach would be (at least thats what i think) to use a raw >>>socket with proto_udp. >>>is this a wrong way to go ? >>> >>>thanks >> >> >>Hi, >> >>hhmmm, I think ICMP messages are not sent through UDP. So, I'm not sure >>but I think its not possible to do that with a UDP Socket. >> >>Yours sincerely >> >>Andy > > > > ok, thanks for your answer. and yes you are right, icmp is not sent > through udp. > would it be possible to work with 2 sockets ? lets say i create an udp > socket, send a dgram and recieve the reply with a raw socket > proto_type_icmp ? > > thanks ok, I've looked in W. Richard Stevens book "TCP/IP Volume 1" and found out, that you can use the UDP Socket to receive the ICMP reply of your sent datagram. In the ICMP message the IP-Header and the first 8 bytes of the IP-Data are transmitted. And Stevens wrote: the ICMP module can assiciate with this information an UDP Port and respectivly a process with the ICMP reply. Yours sincerely Andy  
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