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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= DST=
> > 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= DST= 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 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 is sending a RESET packet
> to 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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