UDP, bad length 1300 > 544 after upgrading to ipfire build 153

Hello,

I see a lot of these errors when trying to start af match or watch a replay in DOTA2. Problem started after I upgraded to 153.

13:35:48.695747 IP ipfire.localdomain.57900 > 139.45.193.10.27017: UDP, length 322
^C13:35:49.114739 IP ipfire.localdomain.64994 > 155.133.248.50.27067: UDP, bad length 1300 > 544

Nothing is logged on the firewall and the session just dies. Had to watch the packet dump on the red interface.

This is my onboard network cards:
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c)
03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c)

Ethernet:
[root@ipfire ~]# cat /var/ipfire/ethernet/settings
CONFIG_TYPE=3
GREEN_DEV=green0
GREEN_MACADDR=00:01:2e:93:a7:de
GREEN_DESCRIPTION=’“pci: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c)”’
GREEN_DRIVER=r8169
RED_DEV=red0
RED_MACADDR=00:01:2e:93:a7:df
RED_DESCRIPTION=’“pci: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c)”’
RED_DRIVER=r8169
BLUE_DEV=blue0
BLUE_MACADDR=04:f0:21:85:41:f4
BLUE_DESCRIPTION=’“pci: Qualcomm Atheros QCA986x/988x 802.11ac Wireless Network Adapter”’
BLUE_DRIVER=ath10k_pci
GREEN_ADDRESS=192.168.1.1
GREEN_NETMASK=255.255.255.0
GREEN_NETADDRESS=192.168.1.0
RED_DHCP_HOSTNAME=ipfire
RED_DHCP_FORCE_MTU=
RED_ADDRESS=0.0.0.0
RED_NETMASK=0.0.0.0
RED_TYPE=DHCP
RED_NETADDRESS=0.0.0.0
ORANGE_DEV=orange0
ORANGE_MACADDR=00:01:2e:93:a7:de
ORANGE_DESCRIPTION=’“pci: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c)”’
ORANGE_DRIVER=r8169
BLUE_ADDRESS=172.16.1.1
BLUE_NETMASK=255.255.255.0
BLUE_NETADDRESS=172.16.1.0

I am out of ideas and was hoping any of you had an idea?

Everything worked again after downgrading to 152.

I think this is a kernel bug related to this: 12563 – Core 153 brakes outgoing video conferencing (zoom, fb messenger and whatsapp)

If you run on x86_64 try the experimental kernel update. If you are in i586 you have to wait until my builder has finished.