Date: Sat, 6 Aug 2005 18:58:02 -0600 From: "Chad Leigh -- Shire.Net LLC" <chad@shire.net> To: FreeBSD - Questions <freebsd-questions@freebsd.org> Subject: jail question -- why can a user programatically see more than one IP address inside a jail? Message-ID: <1AC1583D-DC24-46EC-B061-107F95F973D2@shire.net>
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I have some jails. On 5.3R i386
Some software (some C based, some java) for various reasons, like
licensing, look at all the IP addresses/interfaces available in the
running system.
Inside the jail they return more than just the jails IP address. For
example, FrontBase database (www.frontbase.com) sees the following
inside the jail
"
Host name and IP and ethernet address information
=================================================
Name of this host : db.shire.net
IP address of this host : XXX.70.252.100
IP address : XXX.70.252.132
IP address : 192.168.2.2
IP address : 127.0.0.1
No ethernet interfaces configured
WARNING: The IP address, XXX.70.252.100 for this host db.shire.net is
not configured on any network device.
"
The main address shown, XXX.70.252.100 is the jail's IP.
XXX.70.252.132 is the main address assigned to bge0 on the jail's host
192.168.2.2 is the main address assigned to bge1 on the jail's host
127.0.0.1 is the main address assigned to lo0 on the jail's host
The other bunch of alias IPs assigned to bge0 do not show through.
I was wondering why the jailed processes can see these addresses
though they do not show in ifconfig for example and you cannot do
anything with them...
On a related note we have some java software that is trying to do
multicast inside a jail to do the mDNS stuff for ZeroConf and it is
getting confused for similar reasons it appears (still gathering
details on this)
thanks
Chad
---
Chad Leigh -- Shire.Net LLC
Your Web App and Email hosting provider
chad@shire.net
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