Using Interface Aliases on FreeBSD with ipfw

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1 total messages Started by "Andrew Hodges" Sat, 13 Feb 1999 00:00

#3951

Author: "Andrew Hodges"
Date: Sat, 13 Feb 1999 00:00

92 lines
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Hi,

for purely availability reasons I am using on old DECpc 433W as a filtering Firewall with ipfw on
2.2.8. This sytem has only one ethernet interface and I have been using in with ppp through the
serial port. I am putting ISDN in place and the TA I have has an ethernet interface. 

I am wondering if it would be feasible to use the same interface le0 with 2 ip addresses on different
subnets using something like: 

 ifconfig_le0_alias0="inet 139.100.1.1 netmask 255.255.255.0"
 ifconfig_le0_alias1="inet 192.168.2.1 netmask 255.255.255.0"

and use rc.firewall with the same interface and natd.

Is this possible? Are there any issues?

Thanks
Andrew

ahodges@ozemail.com.au




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<DIV><FONT color=#000000 size=2>Hi,</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT> </DIV>
<DIV><FONT color=#000000 size=2>for purely availability reasons I am using on 
old DECpc 433W as a filtering Firewall with ipfw on</FONT></DIV>
<DIV><FONT size=2>2.2.8. This sytem has only one ethernet interface and I have 
been using in with ppp through the</FONT></DIV>
<DIV><FONT size=2>serial port. I am putting ISDN in place and the TA I have has 
an ethernet interface. </FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>I am wondering if it would be feasible to use the same 
interface le0 with 2 ip addresses on different</FONT></DIV>
<DIV><FONT size=2>subnets using something like: </FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2> ifconfig_le0_alias0="inet 139.100.1.1 netmask 
255.255.255.0"<BR> ifconfig_le0_alias1="inet 192.168.2.1 netmask 
255.255.255.0"</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>and use rc.firewall with the same interface and 
natd.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Is this possible? Are there any issues?</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Thanks</FONT></DIV>
<DIV><FONT size=2>Andrew</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2><A 
href="mailto:ahodges@ozemail.com.au">ahodges@ozemail.com.au</A></FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2></FONT> </DIV></BODY></HTML>

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