North American Network Operators Group

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ingress filtering

  • From: Mr. Dana Hudes
  • Date: Thu May 28 13:43:17 1998

Who *does* do ingress filtering? I have it on our border routers
and customer connect ports. We have transit from MCI and UUNET.
Neither has ingress filters -- see below message from MCI on
The result of course is that spammers and other bad guys can try
to attack your systems with forged source IP addresses.
Random strange people in the 'net send "NETBIOS name service"
(port 137) packets to my unix mail relay, which of course ignores
Other such fun things continue to be seen in the logs.

Subject: Re: RFC1918 addresses from MCI
   Date: Thu, 28 May 1998 08:16:23 -0700
   From: [email protected]
      To: [email protected]
     CC: [email protected]

Mr. Hudes,

Thank you for your note.  MCI does not currently source filter
space at it's ingress points.  Addresses sourced from
non-routable or
invalid addresses are not blocked or filtered.  Addresses
destined to
non-routable addresses spaced are not routed.

If you think it is a security issue and it is on-going then
contact us with the target address so we can investigate.


-Julian Min