[Qemu-devel] [PATCH] Allow user to configure -net user subnet

[Ed Swierk]

In environments where the 10.0.2.0/24 subnet is already used for
another purpose, it's useful to be able to configure a different -net
user (slirp) subnet, such as 192.168.100.0/24.

The attached patch adds a subnet option to -user net. Currently only
/24 subnets (mask 255.255.255.0) are accepted. An error is generated
if the specified subnet is not of the form XX.YY.ZZ.0/24. This
restriction could be relaxed in the future with more extensive changes
to slirp.

One quirk is that the default guest-host for the -redir option remains
10.0.2.15 even if the user passes a different subnet to -net user.
Obviously this can be worked around by explicitly specifying the
correct guest-host. The next patch (qemu-slirp-options.patch) fixes
this issue, among others.

--Ed

qemu-slirp-subnet-option.patch
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