Hello
did anyone has success implementing IPv6 fastpath on 7.18+ ?
I have met the same conditions as fastpath ipv4, the checkbox is active, but no counters! All to 0.
How can I be sure the fastpath is running?
thanks
Have you applied the command and the two rules (at the right spot) that @BrateloSlava and restarted the router as @Sit75 have suggested in the 7.18 beta thread?
Edit:
you may also have a look at @CGGXANNX’s note about IPv6 and TCP MSS and @felixka’s post about IPsec interaction with IPv6 FastPath.
Hello, thank you for your reply. I have no issue with fasttrack-v6, I was talking about fastPATH
My bad. Tough if FastTrack works for you, than FastPath should be too, since the former can’t operate without the later. While we at the topic of FastPath (and FastTrack) the relevant sections of the documentation need some love, since IPv6 FastPath and FastTrack are undocumented features currently.
Fasttrack works, but even with NO RULES in the ipv6 section, the fastpath counter doesnt raise.
For, me, like in ipv4, fastpath counter stay always at 0… but fastrack work well :
[admmikrotik@router70a] > /ip/settings/print
ip-forward: yes
send-redirects: yes
accept-source-route: yes
accept-redirects: no
secure-redirects: yes
rp-filter: strict
ipv4-multipath-hash-policy: l3
tcp-syncookies: yes
tcp-timestamps: random-offset
max-neighbor-entries: 16384
arp-timeout: 30s
icmp-rate-limit: 100000
icmp-rate-mask: 0x1818
icmp-errors-use-inbound-interface-address: no
allow-fast-path: yes
ipv4-fast-path-active: no
ipv4-fast-path-packets: 0
ipv4-fast-path-bytes: 0
ipv4-fasttrack-active: yes
ipv4-fasttrack-packets: 1202060
ipv4-fasttrack-bytes: 1250656041
[admmikrotik@router70a] > /ipv6/settings/print
disable-ipv6: no
forward: yes
multipath-hash-policy: l3
accept-redirects: no
accept-router-advertisements: no
disable-link-local-address: no
stale-neighbor-detect-interval: 30
stale-neighbor-timeout: 60
min-neighbor-entries: 4096
soft-max-neighbor-entries: 8192
max-neighbor-entries: 16384
allow-fast-path: yes
ipv6-fast-path-active: yes
ipv6-fast-path-packets: 0
ipv6-fast-path-bytes: 0
ipv6-fasttrack-active: yes
ipv6-fasttrack-packets: 7301486
ipv6-fasttrack-bytes: 7933132583
I’m on 7.18.2, trying to enable IPv6 fast track, but in winbox, the setting is blank and it won’t let me enable it.
Is the only way to enable it, to manually add a firewall rule (as suggested earlier)?
/ipv6 firewall filter add action=fasttrack-connection chain=forward comment="Enable FastTracked v6 traffic" connection-state=established,related
/ipv6 firewall filter add action=accept chain=forward comment="accept established,related,untracked" connection-state=established,related,untracked
The second rule is already present, but not the first.
Yes, you’ll need both rules. Also, as documented by @EdPa from MikroTik, some bridge settings like DHCP Snooping cause fast path to be ineffective, as a result, fasttrack will also not work on that bridge (shown as active but the counters do not increase), in those cases you’ll only get “partial” fasttracking when moving packets between bridge and (WAN) interfaces external to the bridge only, not for inter-VLAN traffics (if you keep DHCP Snooping enabled).
Thanks, I deleted all the old rules, inserted the new “fasttrack-connection” rule at the top of the “forward” chain that I exported, and reapplied all of the rules, and rebooted.
It looks like it’s working now.
that is FASTTRACK, on my OP, I wrote FAST PATH!
no rules, just packets from one int to another.
I’ve been pretty negative recently in my posts here (I would argue justifiably, though that’s neither here nor there at the moment), but I want to take a moment to offer well deserved praise and give credit where credit is due. So: THANK YOU MikroTik (genuinely) for FINALLY getting around to implementing IPv6 Fastpath/Fasttrack support. The lack of this has been a HUGE showstopper in doing a major IPv6 push to most of our end-users, since we have deployed a LOT of RouterBOARDs to customers as CPE. And prior to this, IPv6 forwarding performance was notably worse than IPv4 (which has had FP/FT for forever now).
However… 
My experience has been largely the same as most others here with 7.18(.2), which is that I can get IPv6 FastTRACK to work great, but FastPATH does not seem to work.
Now, perhaps this is completely a cosmetic/reporting bug, and IPv6 Fastpath actually works just fine; I have not yet taken time to measure actual performance to see if that is the case. But, if I have IPv6 connection tracking turned off, zero IPv6 filter/NAT/mangle rules defined, and ‘/ipv6/settings/allow-fast-path=yes’, then it will show ‘ipv6-fast-path-active: yes’, BUT the ‘ipv6-fast-path-packets’ and ‘ipv6-fast-path-bytes’ counters do NOT budge from 0 at all.
If this is just a cosmetic bug, it’s very different from the one afflicting IPv4 FP/FT in 7.18, where Fasttrack works and the counters count up, but it says ‘ipv4-fasttrack-packets: NO’. I understand this reporting error is fixed in 7.19beta.
I haven’t been super bothered by (apparent) lack of working IPv6 Fastpath in 7.18.x, since we are largely deploying this on customer CPE where it’s pretty important to have some common-sense firewall rules in place, so IPv6 connection tracking has to be on, and thus we take advantage of Fasttrack instead, which seems to work fine. But since Fastpath is supposed to be a headlining feature, and since it would be nice to see this working properly on, say, CCR hardware that’s sitting on our network and forwarding IPv6 traffic to end-users, I am adding my “me too” to this report. (And if IPv6 Fasttrack works but Fastpath doesn’t, that is kind of a shocking thing to have slide through the QA for this 7.18 release, where IPv6 Fastpath was pretty heavily promoted. Like, how does such a bug not get caught on the way out the door…)