12:21:47.873763 IP MYIP1.http > MYIP2.33988: . 309872:311320(1448) ack 1 win 1608 <nop,nop,timestamp 253866603 2408797320>
12:21:47.873770 IP MYIP1.http > MYIP2.33988: . 309872:311320(1448) ack 1 win 1608 <nop,nop,timestamp 253866603 2408797320>
12:21:47.873825 IP MYIP1.http > MYIP2.33988: . 311320:312768(1448) ack 1 win 1608 <nop,nop,timestamp 253866603 2408797320>
From: Karl Tatgenhorst [mailto:karl.tatgenhorst@xxxxxxxxx]
Sent: Tue 19/2/2008 8:43 PM
To: Hayim Shaul
Cc: kernelnewbies@xxxxxxxxxxxx
Subject: Re: duplicated packets
Hayim,
With your tcpdump output are you sure that it is two of the same
packet (same sequence number etc...) It could be that it (the stack)
is expecting a reply or getting a NAK and resending the packet. If
that is the case I believe that the seq numbers should be the same.
Karl
On 2/19/08, Hayim <hayim@xxxxxxxxxxxx> wrote:
>
> Hi all,
>
> I am seeing a very strange behavior and I suspect it comes from the
> kernel.
>
> I have an application that writes to the network using raw socket:
>
> arp_output = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
> int r = sendto(arp_output, p->ether_header(), p->size_of_ether_packet(),
> 0, (sockaddr*)&ip_sock_addr, sizeof(ip_sock_addr));
>
>
> Once in a while it seems that the kernel is duplicating the packet I am
> sending. That is, I call sendto once, but I see two packets with
> tcpdump.
>
>
> Does this make sense to anyone?
>
>
>
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