HI Thanks!! I tried doing this also but the contents of the packets in both the caes is exactlty the same.. Something strange is happening...the gateway also sends an ip pkt to either A or B (sometimes to A , sometimes to B) which says IPv6 hop-by-hop option. In response to thsi particular pkt, the receiver machine(A or B) sends the icmp protoocol unreachable pkt.And the machine which gets the ping request pkt does not reply at all...Why is it so??? Paridhi --- Mani Mahadevan <mrsmani@cisco.com> wrote: > Seems to me that the packet contents are not filled > properly and > sent out to B. > Best way is to > * Enable IP forwarding > * Ping from A to B. > * At B , run tcpdump get the packet contents. > * Now try running with your program. Compare the > contents. > This should throw light on any issues related to pkt > contents. > > -Mani > > > -----Original Message----- > From: kernelnewbies-bounce@nl.linux.org > [mailto:kernelnewbies-bounce@nl.linux.org]On Behalf > Of paridhi bansal > Sent: Tuesday, December 03, 2002 1:53 PM > To: kernelnewbies@nl.linux.org; sarnold@wirex.com > Subject: Re:ICMP Protocol Unreachable > > > Hi > > U are not getting the problem. > > When A sends echo request packet to B, B should send > a > reply packet back to A. But this is not what's > happening. I have put a sniffer on B. B is receiving > the packet as such with source as A and destination > B. > SO what u r saying that i am chaanging the ip b4 > forwarding the packet is not happening. > > The problem is :B is sending the ICMP packet with > Source:B > Destination :Gateway's Interface to B > The ICMP packet type is Destination unreachable > and it's code is Protocol Unreachable. > > > The same thing also happens the other way round i.e > when B pings to A. So i assume problem is somewhere > in > the code..Can it be some port problem or what???? > > __________________________________________________ > Do you Yahoo!? > Yahoo! Mail Plus - Powerful. Affordable. Sign up > now. > http://mailplus.yahoo.com > -- > Kernelnewbies: Help each other learn about the Linux > kernel. > Archive: > http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > __________________________________________________ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
