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The GRE traffic is working in v7.2.7. Then, it stops working after the firmware upgrade to v7.4.3. If the collisions of the GRE tunnel are increasing every time:
diag sys gre list
IPv4:
vd=0 devname=GRE-test devindex=3 ifindex=41
saddr=192.168.1.100 daddr=192.168.1.101 rpdb=0 ref=0
key=0/0 flags=0/0 dscp-copy=0 diffservcode=000000
RX bytes:1760660 (1.6 Mb) TX bytes:653330 (638.0 kb);
RX packets:2669, TX packets:1592, TX carrier_err:0 collisions:3643
npu-info: asic_offload=0, enc/dec=0/0, enc_bk=0/0/0/0, dec_bk=0/0/0/0
rpdb-ver: 00000026 rpdb-gwy: 0.0.0.0 rpdb-oif: 0
diag sys gre list
IPv4:
vd=0 devname=GRE-test devindex=3 ifindex=41
saddr=192.168.1.100 daddr=192.168.1.101 rpdb=0 ref=0
key=0/0 flags=0/0 dscp-copy=0 diffservcode=000000
RX bytes:1760660 (1.6 Mb) TX bytes:653330 (638.0 kb);
RX packets:2669, TX packets:1592, TX carrier_err:0 collisions:3719
npu-info: asic_offload=0, enc/dec=0/0, enc_bk=0/0/0/0, dec_bk=0/0/0/0
rpdb-ver: 00000026 rpdb-gwy: 0.0.0.0 rpdb-oif: 0
Then it matches bug 987501. This issue was seen in 7.4.2 and 7.4.3. This was fixed in v7.2.8 and v7.4.4.
The workaround is to downgrade to v7.2.7 or create an IPsec VPN tunnel as a workaround.
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