Hi!
I am using a Debian 12 (as a VM in VirtualBox on Windows10) to Bridge two interfaces.
enp0s8 for incoming traffic from a CPE, enp0s9 for outgoing traffic to a DSL modem.
So far it is working fine. But i see, that TCP connections do not work properly over the bridge. If I remove the bridge and connect the CPE directly to the modem no issues can be observed.
My guess it is a MTU issue, but i dont know how to solve it. I cannot configure the MTU on the CPE.. setting a fixed MTU on the Bridge and the interfaces did not resolve my issue.
Any ideas?
Thanks!
I am using a Debian 12 (as a VM in VirtualBox on Windows10) to Bridge two interfaces.
enp0s8 for incoming traffic from a CPE, enp0s9 for outgoing traffic to a DSL modem.
So far it is working fine. But i see, that TCP connections do not work properly over the bridge. If I remove the bridge and connect the CPE directly to the modem no issues can be observed.
My guess it is a MTU issue, but i dont know how to solve it. I cannot configure the MTU on the CPE.. setting a fixed MTU on the Bridge and the interfaces did not resolve my issue.
Any ideas?
Code:
cat /etc/network/interfacessource /etc/network/interfaces.d/*# The loopback network interfaceauto loiface lo inet loopbackauto enp0s3iface enp0s3 inet dhcpauto enp0s8iface enp0s8 inet manualauto enp0s9iface enp0s9 inet manualauto br0iface br0 inet manualbridge_ports enp0s8 enp0s9Code:
cat /etc/sysctl.conf ## /etc/sysctl.conf - Configuration file for setting system variables# See /etc/sysctl.d/ for additional system variables.# See sysctl.conf (5) for information.##net.ipv4.conf.default.rp_filter=1#net.ipv4.conf.all.rp_filter=1#net.ipv4.tcp_syncookies=1#net.ipv4.ip_forward=1#net.ipv6.conf.all.forwarding=1#net.ipv4.conf.all.accept_redirects = 0#net.ipv6.conf.all.accept_redirects = 0# net.ipv4.conf.all.secure_redirects = 1#net.ipv4.conf.all.send_redirects = 0#net.ipv4.conf.all.accept_source_route = 0#net.ipv6.conf.all.accept_source_route = 0#net.ipv4.conf.all.log_martians = 1#kernel.sysrq=438net.bridge.bridge-nf-call-arptables = 1net.bridge.bridge-nf-call-ip6tables = 1net.bridge.bridge-nf-call-iptables = 1net.bridge.bridge-nf-filter-pppoe-tagged = 1net.bridge.bridge-nf-filter-vlan-tagged = 1net.bridge.bridge-nf-pass-vlan-input-dev = 1Thanks!
Statistics: Posted by throw732849 — 2024-01-29 08:46