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Special Forums IP Networking Why eth1 with auto dhcp disturbs pppoe over eth0? Post 302995947 by adrhc on Saturday 15th of April 2017 03:25:01 PM
Old 04-15-2017
Why eth1 with auto dhcp disturbs pppoe over eth0?

Hi, I use ubuntu 16.04 desktop with ufw (default setup + 22, 80, 443 ports open).

I connect directly to ISP using pppoe over eth0. I also have eth1 which when disabled the websites are accessible in browser. When starting eth1 with auto dhcp the websites are no longer accessible in browser (give a timeout while trying to load). eth1 is plugged in a LAN port of a router with its WAN port unplugged (yeah, don't ask why). When setting a manual ip on eth1 while gateway and dns are left blank the websites are accessible in browser again.

Why this happens?
 

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Match-all classifier in tc(8)					       Linux					     Match-all classifier in tc(8)

NAME
matchall - traffic control filter that matches every packet SYNOPSIS
tc filter ... matchall [ skip_sw | skip_hw ] [ action ACTION_SPEC ] [ classid CLASSID ] DESCRIPTION
The matchall filter allows to classify every packet that flows on the port and run a action on it. OPTIONS
action ACTION_SPEC Apply an action from the generic actions framework on matching packets. classid CLASSID Push matching packets into the class identified by CLASSID. skip_sw Do not process filter by software. If hardware has no offload support for this filter, or TC offload is not enabled for the inter- face, operation will fail. skip_hw Do not process filter by hardware. EXAMPLES
To create ingress mirroring from port eth1 to port eth2: tc qdisc add dev eth1 handle ffff: ingress tc filter add dev eth1 parent ffff: matchall skip_sw action mirred egress mirror dev eth2 The first command creats an ingress qdisc with handle ffff: on device eth1 where the second command attaches a matchall filters on it that mirrors the packets to device eth2. To create egress mirroring from port eth1 to port eth2: tc qdisc add dev eth1 handle 1: root prio tc filter add dev eth1 parent 1: matchall skip_sw action mirred egress mirror dev eth2 The first command creats an egress qdisc with handle 1: that replaces the root qdisc on device eth1 where the second command attaches a matchall filters on it that mirrors the packets to device eth2. To sample one of every 100 packets flowing into interface eth0 to psample group 12: tc qdisc add dev eth0 handle ffff: ingress tc filter add dev eth0 parent ffff: matchall action sample rate 100 group 12 SEE ALSO
tc(8), iproute2 21 Oct 2015 Match-all classifier in tc(8)
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