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NAT warning if IPv4 loopback address in /etc/resolv.conf

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Bob Lantz
2019-04-04 16:40:04 -07:00
parent 598d694058
commit 664ba39383
1 changed files with 4 additions and 0 deletions
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bin/mn
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@@ -388,6 +388,10 @@ class MininetRunner( object ):
listenPort=opts.listenport ) listenPort=opts.listenport )
if opts.ensure_value( 'nat', False ): if opts.ensure_value( 'nat', False ):
with open( '/etc/resolv.conf' ) as f:
if 'nameserver 127.' in f.read():
warn( '*** Warning: loopback address in /etc/resolv.conf '
'may break host DNS over NAT\n')
mn.addNAT( *opts.nat_args, **opts.nat_kwargs ).configDefault() mn.addNAT( *opts.nat_args, **opts.nat_kwargs ).configDefault()
# --custom files can set CLI or change mininet.cli.CLI # --custom files can set CLI or change mininet.cli.CLI