port forwarding weirdness

[Wayne Conrad]

I see these all the time on my freesco, and I think they are attacks.  See the ":53"?  They're going after bind, the DNS server.  I guess there are buffer overflow attacks against some versions of bind, and they could be trying that.  Or maybe they're trying to do a DNS Zone Transfer; I think that's a way for the attacker to gain more information about your LAN.  Nothing to worry about, I think, with port 53 blocked like it is.

My understanding is that this is so common because there's a Windows based worm out there that is going after bind.

  Wayne Conrad

On Sun, 22 July 2001, "Sean Roe" wrote:
> I have been experimenting with freesco http://www.freesco.org (FREE ciSCO)
> router distro as a replacement for Linux Router Project. I have a DNS Server
> setup behind the firewall servicing port 53 requests.
> 
> I have Freesco and running and all is well except for DNS.  I have a DNS
> server behind it and I have ports 53 udp and tcp passed through to it.  I
> keep getting these errors:
> 
> Jul 21 18:47:21 - kernel: IP fw-in rej eth0 UDP 64.14.66.100:11415
> 206.165.207.198:53 L=58 S=0x00 I=0 F=0x0040 T=51
> Jul 21 18:47:36 - last message repeated 4 times
> Jul 21 18:47:36 - kernel: IP fw-in rej eth0 UDP 64.14.66.100:12057
> 206.165.207.198:53 L=69 S=0x00 I=0 F=0x0040 T=51
> Jul 21 18:47:44 - kernel: IP fw-in rej eth0 UDP 64.14.66.100:11415
> 206.165.207.198:53 L=58 S=0x00 I=0 F=0x0040 T=51
> Jul 21 18:47:56 - last message repeated 4 times
> Jul 21 18:47:58 - kernel: IP fw-in rej eth0 UDP 64.14.66.100:12057
> 206.165.207.198:53 L=58 S=0x00 I=0 F=0x0040 T=51
> Jul 21 18:48:00 - kernel: IP fw-in rej eth0 UDP 64.14.66.100:11415
> 206.165.207.198:53 L=58 S=0x00 I=0 F=0x0040 T=51
> Jul 21 18:48:25 - last message repeated 4 times
> Jul 21 18:48:27 - kernel: IP fw-in rej eth0 UDP 64.14.66.100:12057
> 206.165.207.198:53 L=58 S=0x00 I=0 F=0x0040 T=51
> Jul 21 19:04:20 - kernel: IP fw-in rej eth0 UDP 151.203.0.85:44947
> 206.165.207.198:53 L=64 S=0x00 I=61649 F=0x0040 T=245
> 
> 
> My question is what causes these?  Is it a hack attempt?