Normally you can't spoof source addresses for TCP connections, the return traffic would go to the real IP, unless there's some exotic BCP hijack involved.
Are you sure that your router has not been compromised and a proxy server installed? Like SOCKS if it's a Mikrotik? -----Original Message----- From: AF <af-boun...@af.afmug.com> On Behalf Of Christopher Tyler Sent: Friday, June 19, 2020 11:46 AM To: AnimalFarm Microwave Users Group <af@af.afmug.com> Subject: Re: [AFMUG] Issue with Google Yes, NAT is in play here, I just now increased the NAT pool to 128 addresses based on TJ's theory that the NAT pool might be too small. The source IP's seem to be spoofed or proxied somehow as the first IP address in the list from Google is our ARIN /20 Network address (x.x.0.0) and I find it hard to believe that our gateway router is scraping Google for content. -- Christopher Tyler Senior Network Engineer MTCRE/MTCNA/MTCTCE/MTCWE Total Highspeed Internet Solutions 1091 W. Kathryn Street Nixa, MO 65714 (417) 851-1107 x. 9002 www.totalhighspeed.com ----- Original Message ----- > From: "afmug" <af...@ics-il.net> > To: "AnimalFarm Microwave Users Group" <af@af.afmug.com> > Sent: Friday, June 19, 2020 11:37:58 AM > Subject: Re: [AFMUG] Issue with Google > You have the source IP, port, and time. What more do you need to > determine who's doing it? > > I'm assuming you're NATing customers at the router in question. > > > > ----- > Mike Hammett > [ http://www.ics-il.com/ | Intelligent Computing Solutions ] [ > https://www.facebook.com/ICSIL ] [ > https://plus.google.com/+IntelligentComputingSolutionsDeKalb ] [ > https://www.linkedin.com/company/intelligent-computing-solutions ] [ > https://twitter.com/ICSIL ] [ http://www.midwest-ix.com/ | Midwest > Internet Exchange ] [ https://www.facebook.com/mdwestix ] [ > https://www.linkedin.com/company/midwest-internet-exchange ] [ > https://twitter.com/mdwestix ] [ http://www.thebrotherswisp.com/ | The > Brothers WISP ] [ https://www.facebook.com/thebrotherswisp ] [ > https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg ] > > From: "Christopher Tyler" <ch...@totalhighspeed.net> > To: "AnimalFarm Microwave Users Group" <af@af.afmug.com> > Sent: Friday, June 19, 2020 10:59:30 AM > Subject: [AFMUG] Issue with Google > > So the other day we got an email (excerpt below) from Google's automated tool... > > We are seeing automated scraping of Google Web Search from a large > number of your IPs. Automated scraping violates our /robots.txt file > and also our Terms of Service. We request that you terminate this > traffic immediately. Failure to do so may cause your network to be > blocked by our abuse systems. > > To allow you to identify the traffic, we are providing a list of your > IPs they used today (Source field), as well as the most common > destination (Google) IP and port and a timestamp of a recent request > (in UTC) to aid in your identification. Note that this list may not be > exhaustive, and we request that you terminate all such traffic, not > just traffic from IPs in this list. > > All of the destination ports (to Google) are either 80 or 443, so they > at least appear to be legit web traffic on the surface. They are > obviously spoofed IP address as there are network addresses in the > list and the IP belongs to a router that doesn't appear to be > compromised in any way. The initial letter included 700+ IP addresses from our network. > > It's now affecting our customers as they are now getting Captcha's for > every couple of Google searches that they perform. > > Does anyone know of a good way to track the perpetrator(s) down and/or > know of a way to mitigate this? > > -- > Christopher Tyler > Senior Network Engineer > MTCRE/MTCNA/MTCTCE/MTCWE > > Total Highspeed Internet Solutions > 1091 W. Kathryn Street > Nixa, MO 65714 > (417) 851-1107 x. 9002 > www.totalhighspeed.com > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com
