test-network: use the same MTU bytes for veth interfaces

Hopefully fixes #34204.

diff --git a/test/test-network/systemd-networkd-tests.py b/test/test-network/systemd-networkd-tests.py
index 04ababe827958fef6574cc89b48aa96e32d30b33..8a2c5af3989a7c23eef3e2ccfe3860f30df179b7 100755 (executable)
--- a/test/test-network/systemd-networkd-tests.py
+++ b/test/test-network/systemd-networkd-tests.py
@@ -5734,12 +5734,14 @@ class NetworkdRATests(unittest.TestCase, Utilities):
         self.check_ndisc_mtu(1410)
 
         check_output('ip link set dev veth99 mtu 1600')
+        check_output('ip link set dev veth-peer mtu 1600')
         self.check_ndisc_mtu(1410)
 
         check_output(f'{test_ndisc_send} --interface veth-peer --type ra --lifetime 1hour --mtu 1700')
         self.check_ndisc_mtu(1600)
 
         check_output('ip link set dev veth99 mtu 1800')
+        check_output('ip link set dev veth-peer mtu 1800')
         self.check_ndisc_mtu(1700)
 
     def test_ipv6_token_prefixstable(self):