Messages in this thread |  | | Subject | Re: ioctl SIOCGIFNETMASK: ip alias bug 2.4.9 and 2.2.19 | Date | Thu, 6 Sep 2001 10:04:44 -0400 (EDT) | From | (Wietse Venema) |
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Andrey Savochkin: > > Even if it checked the address it would not be unique because you can have multiple > > interfaces with the same addresses but different netmasks.
The same IP address with different netmasks on the same hardware interface? The mind boggles. How does one handle broadcasts?
> The only one good reason for an SMTP server to bother about IP addresses at > all is a quick check for mail loops, i.e. a check at the moment of opening > TCP connection to send a message whether your peer is yourself. > Bothering about network masks just doesn't have any valid grounds.
The issue is not MTA loop detection.
Postfix uses the local netmask info to distinguish between local and remote networks. At the discretion of the sysadmin, systems on local subnets can be granted different rights than random systems on the Internet.
If Linux insists on breaking SIOCGIFCONF then so be it, even though it works perfectly well on any non-Linux system that I could lay my hands on.
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