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Problems setting up IP_MASQUERADE: take #2



I am experiencing some module loading weirdness with the 2.6.21.x series
kernels [Fedora/rawhide] that I do not see with the 2.x.(19|20).x
kernels in FC6.

FC6
----
* reboot the system
* login /start the desktop
* launch Mac-On-Linux

==> all is well...

Mac-On-Linux is a Linux/PPC program that virtualizes MacOS or MacOSX in
Linux. MOL uses an IP tunnel to establish communications between the
Linux host and the virtualized MAC operating system.

When MOL is launched the following kernel modules are loaded:

Module                  Size  Used by
xt_tcpudp               3424  2 
ipt_MASQUERADE          4096  1 
iptable_nat             8388  1 
nf_nat                 20500  2 ipt_MASQUERADE,iptable_nat
nf_conntrack_ipv4      13448  2 iptable_nat
nf_conntrack           72968  4
ipt_MASQUERADE,iptable_nat,nf_nat,nf_conntrack_ipv4
nfnetlink               8344  3 nf_nat,nf_conntrack_ipv4,nf_conntrack
ip_tables              14900  1 iptable_nat
x_tables               18372  4
xt_tcpudp,ipt_MASQUERADE,iptable_nat,ip_tables
tun                    13728  1 
mol                    59304  1 


Fedora/Rawhide
--------------
* reboot the system
* login /start the desktop
* launch Mac-On-Linux

==> networking is borked. 

An examination of the output from 'lsmod' shows some modules did not
load:

Module                  Size  Used by
nf_nat                 20660  0
nf_conntrack_ipv4      13448  1
nf_conntrack           73408  2 nf_nat,nf_conntrack_ipv4
nfnetlink               8344  3 nf_nat,nf_conntrack_ipv4,nf_conntrack
ip_tables              14900  0
x_tables               18404  1 ip_tables
tun                    13504  1
mol                    59304  1



* exit Mac-On-Linux
* launch Mac-on-Linux

==> all is now well. 

An examination of the output from 'lsmod' shows the missing modules have
magically appeared:

Module                  Size  Used by
xt_tcpudp               3424  2
ipt_MASQUERADE          4096  1
iptable_nat             8452  1
nf_nat                 20660  2 ipt_MASQUERADE,iptable_nat
nf_conntrack_ipv4      13448  2 iptable_nat
nf_conntrack           73408  4 ipt_MASQUERADE,iptable_nat,nf_nat,nf_conntrack_ipv4
nfnetlink               8344  3 nf_nat,nf_conntrack_ipv4,nf_conntrack
ip_tables              14900  1 iptable_nat
x_tables               18404  4 xt_tcpudp,ipt_MASQUERADE,iptable_nat,ip_tables
tun                    13504  1
mol                    59304  1


Looks like something has changed in the 2.6.21.x kernels that effects
how IP_MASQUERADE is set up.


Thoughts???


-Joseph

-- 
jsacco [at] gnome [dot] org


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