Problem Receiving the first OSPF packet Post: 302239596

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Special Forums IP Networking Problem Receiving the first OSPF packet Post 302239596 by cosmic_egg on Wednesday 24th of September 2008 04:53:04 AM

09-24-2008

Registered User

Thanks for the reply and sorry for late reply. but I think that problem is not understood correctly.
I will try more explanation.
This is what I do. I do not interact with a an OSPF client as yet.
I am trying to develop code which could just send and receive OSPF packet.

Scenario1:
PC1

1) send any ospf packet(need not be an Hello packet) to PC2.
and wait for a OSPF packet.

PC2

2) See in Ethereal packet sniffer the packet

PC2

3) Send any OSPF packet to PC1.

PC1

4) My application is able to receive the OSPF packet. and also can see the packet in the ethereal packet sniffer

The above scenario works as expected but when
scenario2.

PC1

1) Wait for any OSPF packet(Application has not sent an OSPF packet yet)

PC2

2) Send an OSPF packet to PC1

PC1

3) Can see the packet in ethereal packet sniffer but my application times out waiting on the raw socket(Not received the data).

Why in the second scenario would my application not get the data from the kernal/os?

Well for fimblo's question

1) What happens when you send yourself a hello packet? Have you tried sending a HELLO packet from another client? (zebra, cisco, etc).

Ans. I just receive and ICMP message (Destination Unreacable | Protocol Unreachable). As I do not have a OSPF client on the other machine.
However this gives me an idea of going through zebra code. and figuring out how are they able to receive the packets.
I will also try doing as suggested in coming days. as that is my next step.

2) Are you listening on 224.0.0.5? or 224.0.0.6?
If the IP next-header field set correctly? (89)

Ans. I was just listening on the raw socket that I used to send and receive data in scenario 1.

Please Forgive me any inconsistencies I am just an amateur programmer and new to discussion forums.

cosmic_egg

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LEARN ABOUT DEBIAN

ldns_pkt_edns_data

ldns(3) 						     Library Functions Manual							   ldns(3)

NAME

       ldns_pkt_edns,	 ldns_pkt_edns_udp_size,   ldns_pkt_edns_extended_rcode,   ldns_pkt_edns_version,   ldns_pkt_edns_z,   ldns_pkt_edns_data,
       ldns_pkt_set_edns_udp_size, ldns_pkt_set_edns_extended_rcode, ldns_pkt_set_edns_version, ldns_pkt_set_edns_z, ldns_pkt_set_edns_data-

SYNOPSIS

       #include <stdint.h>
       #include <stdbool.h>

       #include <ldns/ldns.h>

       bool ldns_pkt_edns(const ldns_pkt *packet);

       uint16_t ldns_pkt_edns_udp_size(const ldns_pkt *packet);

       uint8_t ldns_pkt_edns_extended_rcode(const ldns_pkt *packet);

       uint8_t ldns_pkt_edns_version(const ldns_pkt *packet);

       uint16_t ldns_pkt_edns_z(const ldns_pkt *packet);

       ldns_rdf* ldns_pkt_edns_data(const ldns_pkt *packet);

       void ldns_pkt_set_edns_udp_size(ldns_pkt *packet, uint16_t s);

       void ldns_pkt_set_edns_extended_rcode(ldns_pkt *packet, uint8_t c);

       void ldns_pkt_set_edns_version(ldns_pkt *packet, uint8_t v);

       void ldns_pkt_set_edns_z(ldns_pkt *packet, uint16_t z);

       void ldns_pkt_set_edns_data(ldns_pkt *packet, ldns_rdf *data);

DESCRIPTION

       ldns_pkt_edns() returns true if this packet needs and EDNS rr to be sent.  At the moment the only reason is an expected packet size  larger
	      than 512 bytes, but for instance dnssec would be a good reason too.

	      packet: the packet to check
	      Returns true if packet needs edns rr

       ldns_pkt_edns_udp_size() return the packet's edns udp size
	      packet: the packet
	      Returns the size

       ldns_pkt_edns_extended_rcode() return the packet's edns extended rcode
	      packet: the packet
	      Returns the rcode

       ldns_pkt_edns_version() return the packet's edns version
	      packet: the packet
	      Returns the version

       ldns_pkt_edns_z() return the packet's edns z value
	      packet: the packet
	      Returns the z value

       ldns_pkt_edns_data() return the packet's edns data
	      packet: the packet
	      Returns the data

       ldns_pkt_set_edns_udp_size() Set the packet's edns udp size
	      packet: the packet
	      s: the size

       ldns_pkt_set_edns_extended_rcode() Set the packet's edns extended rcode
	      packet: the packet
	      c: the code

       ldns_pkt_set_edns_version() Set the packet's edns version
	      packet: the packet
	      v: the version

       ldns_pkt_set_edns_z() Set the packet's edns z value
	      packet: the packet
	      z: the value

       ldns_pkt_set_edns_data() Set the packet's edns data
	      packet: the packet
	      data: the data

AUTHOR

       The ldns team at NLnet Labs. Which consists out of Jelte Jansen and Miek Gieben.

REPORTING BUGS

       Please report bugs to ldns-team@nlnetlabs.nl or in our bugzilla at http://www.nlnetlabs.nl/bugs/index.html

COPYRIGHT

       Copyright (c) 2004 - 2006 NLnet Labs.

       Licensed under the BSD License. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

SEE ALSO

       ldns_pkt.  And perldoc Net::DNS, RFC1034, RFC1035, RFC4033, RFC4034  and RFC4035.

REMARKS

       This manpage was automaticly generated from the ldns source code by use of Doxygen and some perl.

								    30 May 2006 							   ldns(3)