Re: Mysterious packet
On Thursday, November 08, 2012 11:58:33 AM Darac Marjal wrote:
> On Thu, Nov 08, 2012 at 03:26:23PM +0000, Hendrik Boom wrote:
> > I've started getting messages like the following:
> >
> > [12332.047451] IN=ppp0 OUT=ppp0 SRC=74.125.133.188 DST=25.46.128.71
> > LEN=40 TOS=0x00 PREC=0x00 TTL=50 ID=46353 PROTO=TCP SPT=5228 DPT=44380
> > WINDOW=0 RES=0x00 RST URGP=0 [111179.489288] IN=ppp0 OUT=ppp0
> > SRC=74.125.133.188 DST=25.45.89.15 LEN=40 TOS=0x00 PREC=0x00 TTL=50
> > ID=25315 PROTO=TCP SPT=5228 DPT=43491 WINDOW=0 RES=0x00 RST URGP=0
> >
> > Now these IP numbers are not on my LAN, which is masqueraded. They also
> > bear no relationship to my external-world IP number. If it's about a
> > packet being sent from 4.125.133.188 to either of the others, my ISP
> > shouldn't even be sending it to me. Do I understand the message
> > correctly?
>
> Yep. As I understand it 74.125.133.188:5228 is sending a RESET packet
> to 25.46.128.71:44380. By the looks of things, though, your kernel is
> responding as you'd expect it to and re-routing the packet back out your
> PPP connection (that is, it came in on ppp0, it's not for you, so you
> pass it back out on the default route which I imagine is ppp0).
Presented this way, it could be a DDoS attack on either the src or the dest.
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