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An5teifo
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Posts: 84
Joined: Mon Dec 13, 2021 10:51 am
Location: Austria

Speed IPv6 with Packet Sniffer

Thu Feb 09, 2023 2:52 pm

Dear forum,
I am running a CCR2004-16G-2S+ as my main internet router. As my local ISP only provide IPv4 addresses I have some tunnels to other ISPs with different technologies (GRE, SIT, EoIP, VXLAN).
So far everything works properly and I get my usual expected up- & download speed (300/40 for IPv4 & ~150/40 for IPv6 due to being a free service).

Yesterday I additional added SELKS which is a Suricata based IDS/IPS. On Mikrotik I enabled packet sniffer and forwarding any tcp & udp traffic to it. Works also well.

BUT what I saw today was kind of strange: While having Packet Sniffer enable I still do get full IPv4 speed but on IPv6 the speed dropped to 2-3 Mbit download (upload remained the same).
Not sure if this is a bug and already opened a ticket at Mikrotik support.

Anyone else saw such an issue?

I tried the same setup on my virtualized x86 router which are the next routing layer in my network and Packet Sniffer there does not have any issues with IPv6 download speeds.

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