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test: Add TFTP / DNS collision test.
Add a test case where a TFTP client in k8s1 uses the DNS proxy port of k8s2 as it's ephemeral local (source) port number. This exposes a problem with the iptables rules used in proxy redirection in k8s2, as the response TFTP packets get intercepted by a socket match rule. As of now, this test case fails, but the fix in a following commit fixes the underlying problem. Related: #12241 Signed-off-by: Jarno Rajahalme <jarno@covalent.io>
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