Has anyone seen an increase of broadcast pings, where the source route
appears to be from a nameserver?
We took a look through our access-list logs, and it seems all of the
attempted attacks during the last few days have had an IP-source of a
nameserver.
Just thought it was curious.
Best regards,
Jamie Scheinblum - FASTNET(tm) / You Tools Corporation
jamie@fast.net (610)954-5200 http://www.fast.net/
FASTNET - Business and Personal Internet Solutions
Yes we see a lot of broadcast pings, one network after the next in
sequential order through CIDR blocks. Fun. Probably 5-10 attacks/day.
I had a customers link go down because they were the target of a smurf
attack a few weeks ago, and when I was sniffing the link to find out what
was going on, I found tons of packets coming from root nameservers, .gov
sites, and other places. If I hadn't been at a terminal, I'd have done a
better job of logging them when it happened. As it stands, I just turned
off ICMP into my routers for a few hours and all was well. What I would
have given to have had a dedicated sniffer so I could have done a better
job of logging.
Regards,
Joe Shaw - jshaw@insync.net
NetAdmin - Insync Internet Services
Fortune for the day: "Speak softly and carry a +6 two-handed sword."
block/log broadcast pings: