You MUST be very careful.
RTFM :-)) (Sorry)
# less /etc/doc/howto/en/IP-Masquerade-HOWTO.gz Section 7:23 in SuSE 6.4
Starts at about line 4620!!!
Masquerading DOESN'T work using aliased interfaces.
It uses explicity devices -
eg eth0.
There may be an error in your software!
Regards,
Bruce.
>Hello,
>
>This behavior is apparent with both Linux kernels 2.2.14 and
>2.3.99-pre6.3 on the DEC (Compaq) Alpha. This box is acting as a MASQ
>gateway (ipchains; iptables -t nat) and our ISP is preparing to change
>out subnet this weekend (or sometime thereabouts). Not a problem says
>I; I'll just add an alias and new default route, and let it failover.
>
>All worked fine the remainder of the day, but today things were not all
>well. None of the masqueraded boxes were able to access beyond the
>gateway; however, the gateway box itself had no problems going to either
>side. It is not an ISP problem, and I can narrow it down to this
>scenario:
>
># route
>Kernel IP routing table
>Destination Gateway Genmask Flags Metric Ref Use
>Iface
>localnet * 255.255.255.0 U 0 0 0
>eth1
>209.101.87.0 * 255.255.255.0 U 0 0 0
>eth0
>default CISCO.SPACEY.NE 0.0.0.0 UG 0 0 0
>eth0
>default CISCO.SPACEY.NE 0.0.0.0 UG 0 0 0
>eth0
>
># ifconfig
>eth0 Link encap:Ethernet HWaddr 08:00:2B:E4:32:7E
> inet addr:209.101.87.28 Bcast:209.101.87.255
>Mask:255.255.255.0
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:190133 errors:0 dropped:0 overruns:0 frame:0
> TX packets:35699 errors:0 dropped:0 overruns:0 carrier:0
> collisions:46 txqueuelen:100
> Interrupt:10 Base address:0x8800
>
>eth0:1 Link encap:Ethernet HWaddr 08:00:2B:E4:32:7E
> inet addr:207.168.50.156 Bcast:207.168.50.255
>Mask:255.255.255.0
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> Interrupt:10 Base address:0x8800
>
>eth1 Link encap:Ethernet HWaddr 00:50:04:A8:DB:9E
> inet addr:192.168.68.252 Bcast:192.168.68.255
>Mask:255.255.255.0
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:2180626 errors:2 dropped:0 overruns:0 frame:2
> TX packets:139768 errors:0 dropped:0 overruns:0 carrier:0
> collisions:33 txqueuelen:100
> Interrupt:15 Base address:0x9000
>
>If I "ifconfig eth0:1 up", MASQ stops working; if I "ifconifg eth0:1
>down", it begins working immediately. I don't know if this is a bug
>that needs to be reported, or if it is simply my own misunderstanding,
>in which case enlightenment would be appreciated.
>
>Thanks,
>Christopher
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