34 lines
1012 B
Bash
Executable File
34 lines
1012 B
Bash
Executable File
#! /bin/bash
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. ./config.sh
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C1=10.2.1.41
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C2=10.2.1.71
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# 700 = Linux's minimum PMTU (552) + weave framing overheads
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# (currently about 60, but we leave some margin). That way the PMTUs
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# seen by containers is still >= 552.
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drop_large_udp_packets="FORWARD -p udp --destination-port 6783 -m length '!' --length 0:700 -j DROP"
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start_suite "PMTU discovery and packet fragmentation"
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weave_on $HOST1 launch
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weave_on $HOST2 launch
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start_container $HOST1 $C1/24 --name=c1
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start_container $HOST2 $C2/24 --name=c2
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run_on $HOST2 "sudo iptables -I $drop_large_udp_packets"
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assert_raises "weave_on $HOST2 connect $HOST1"
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sleep 35 # give weave time to discover the PMTU
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# Check large packets get through. The first attempt typically fails,
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# since the sending container hasn't discovered the PMTU yet. The 2nd
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# attempt should succeed.
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exec_on $HOST2 c2 $PING -s 10000 $C1 1>/dev/null 2>&1 || true
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assert_raises "exec_on $HOST2 c2 $PING -s 10000 $C1"
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run_on $HOST2 "sudo iptables -D $drop_large_udp_packets"
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end_suite
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