Help required: slow upload speeds with PPPoE connection

muttley · Tue Mar 05, 2024 9:55 pm

Hi all,
I've been running a Mikrotik HEX rb750gr3 as my primary router for many years without any issues on my 50/50Mbps Fibre line - I'm not exactly sure what transpired but now when I connect to my ISP via PPPoE, the performance is terrible. There seems to be a definite delay/latency issue, download is fine at 50Mbps but the upload is basically non existent.

If I plug in a cheap TP-Link router, I get full 50/50 with no issues, plug in the Mikrotik, same issue occurs.
I borrowed a Mikrotik HAP AC3 from a friend - same issue. I then went ahead and purchased a new Mikrotik HAP AX3 and the exact same issue occurs.
This leads me to believe that I'm sitting with a config issue (I've tested all network cables/tried various factory made ones so I can rule this out as an issue).

Setup: Fibre ONT -> Mikrotik Eth1

Here's a print of my current config:

[admin@MikroTik] > export compact hide-sensitive
# 2024-03-05 15:29:25 by RouterOS 7.14
# software id = **ELIDED**
#
# model = RB750Gr3
# serial number = **ELIDED**
/interface bridge
add admin-mac=**ELIDED** auto-mac=no comment=defconf name=bridge
/interface pppoe-client
add add-default-route=yes disabled=no interface=ether1 name=pppoe-out1 use-peer-dns=yes user=\
    xxxxx0@telkomsa.net
/interface list
add comment=defconf name=WAN
add comment=defconf name=LAN
/ip hotspot profile
set [ find default=yes ] html-directory=hotspot
/ip pool
add name=default-dhcp ranges=192.168.88.10-192.168.88.254
/ip dhcp-server
add address-pool=default-dhcp interface=bridge lease-time=10m name=defconf
/port
set 0 name=serial0
/interface bridge port
add bridge=bridge comment=defconf interface=ether2
add bridge=bridge comment=defconf interface=ether3
add bridge=bridge comment=defconf interface=ether4
add bridge=bridge comment=defconf interface=ether5
/ip firewall connection tracking
set udp-timeout=10s
/ip neighbor discovery-settings
set discover-interface-list=LAN
/interface detect-internet
set detect-interface-list=all
/interface list member
add comment=defconf interface=bridge list=LAN
add comment=defconf interface=ether1 list=WAN
add interface=pppoe-out1 list=WAN
/ip address
add address=192.168.88.1/24 comment=defconf interface=bridge network=192.168.88.0
/ip dhcp-client
add comment=defconf disabled=yes interface=ether1
/ip dhcp-server network
add address=192.168.88.0/24 comment=defconf dns-server=192.168.88.1 gateway=192.168.88.1
/ip dns
set allow-remote-requests=yes
/ip dns static
add address=192.168.88.1 comment=defconf name=router.lan
/ip firewall filter
add action=accept chain=input comment="defconf: accept established,related,untracked" connection-state=\
    established,related,untracked
add action=drop chain=input comment="defconf: drop invalid" connection-state=invalid
add action=accept chain=input comment="defconf: accept ICMP" protocol=icmp
add action=accept chain=input comment="defconf: accept to local loopback (for CAPsMAN)" dst-address=\
    127.0.0.1
add action=drop chain=input comment="defconf: drop all not coming from LAN" in-interface-list=!LAN
add action=accept chain=forward comment="defconf: accept in ipsec policy" ipsec-policy=in,ipsec
add action=accept chain=forward comment="defconf: accept out ipsec policy" ipsec-policy=out,ipsec
add action=fasttrack-connection chain=forward comment="defconf: fasttrack" connection-state=\
    established,related hw-offload=yes
add action=accept chain=forward comment="defconf: accept established,related, untracked" \
    connection-state=established,related,untracked
add action=drop chain=forward comment="defconf: drop invalid" connection-state=invalid
add action=drop chain=forward comment="defconf: drop all from WAN not DSTNATed" connection-nat-state=\
    !dstnat connection-state=new in-interface-list=WAN
/ip firewall nat
add action=masquerade chain=srcnat comment="defconf: masquerade" ipsec-policy=out,none \
    out-interface-list=WAN
# no interface
add action=masquerade chain=srcnat out-interface=pppoe-out1
/ipv6 firewall address-list
add address=::/128 comment="defconf: unspecified address" list=bad_ipv6
add address=::1/128 comment="defconf: lo" list=bad_ipv6
add address=fec0::/10 comment="defconf: site-local" list=bad_ipv6
add address=::ffff:0.0.0.0/96 comment="defconf: ipv4-mapped" list=bad_ipv6
add address=::/96 comment="defconf: ipv4 compat" list=bad_ipv6
add address=100::/64 comment="defconf: discard only " list=bad_ipv6
add address=2001:db8::/32 comment="defconf: documentation" list=bad_ipv6
add address=2001:10::/28 comment="defconf: ORCHID" list=bad_ipv6
add address=3ffe::/16 comment="defconf: 6bone" list=bad_ipv6
/ipv6 firewall filter
add action=accept chain=input comment="defconf: accept established,related,untracked" connection-state=\
    established,related,untracked
add action=drop chain=input comment="defconf: drop invalid" connection-state=invalid
add action=accept chain=input comment="defconf: accept ICMPv6" protocol=icmpv6
add action=accept chain=input comment="defconf: accept UDP traceroute" dst-port=33434-33534 protocol=udp
add action=accept chain=input comment="defconf: accept DHCPv6-Client prefix delegation." dst-port=546 \
    protocol=udp src-address=fe80::/10
add action=accept chain=input comment="defconf: accept IKE" dst-port=500,4500 protocol=udp
add action=accept chain=input comment="defconf: accept ipsec AH" protocol=ipsec-ah
add action=accept chain=input comment="defconf: accept ipsec ESP" protocol=ipsec-esp
add action=accept chain=input comment="defconf: accept all that matches ipsec policy" ipsec-policy=\
    in,ipsec
add action=drop chain=input comment="defconf: drop everything else not coming from LAN" \
    in-interface-list=!LAN
add action=accept chain=forward comment="defconf: accept established,related,untracked" connection-state=\
    established,related,untracked
add action=drop chain=forward comment="defconf: drop invalid" connection-state=invalid
add action=drop chain=forward comment="defconf: drop packets with bad src ipv6" src-address-list=bad_ipv6
add action=drop chain=forward comment="defconf: drop packets with bad dst ipv6" dst-address-list=bad_ipv6
add action=drop chain=forward comment="defconf: rfc4890 drop hop-limit=1" hop-limit=equal:1 protocol=\
    icmpv6
add action=accept chain=forward comment="defconf: accept ICMPv6" protocol=icmpv6
add action=accept chain=forward comment="defconf: accept HIP" protocol=139
add action=accept chain=forward comment="defconf: accept IKE" dst-port=500,4500 protocol=udp
add action=accept chain=forward comment="defconf: accept ipsec AH" protocol=ipsec-ah
add action=accept chain=forward comment="defconf: accept ipsec ESP" protocol=ipsec-esp
add action=accept chain=forward comment="defconf: accept all that matches ipsec policy" ipsec-policy=\
    in,ipsec
add action=drop chain=forward comment="defconf: drop everything else not coming from LAN" \
    in-interface-list=!LAN
/system note
set show-at-login=no
/tool mac-server
set allowed-interface-list=LAN
/tool mac-server mac-winbox
set allowed-interface-list=LAN

Any help would really be appreciated

Tue Mar 05, 2024 11:31 pm

Two different srcnat rules is weird, and though not likely your immediate culprit, one of the two is unhelpful. Pick one.

My bet for your actual problem is having both ether1 and pppoe-out1 in the WAN list, giving your router two paths to the Internet when only one works. Drop ether1 from this list. It gets pulled in as the parent of pppoe-out1.

The "# no interface" flag set in the config is RouterOS telling you your PPPoE negotiation isn't working. Check the logs.

I'd clear out the rest of the flotsam while you're in there fixing things, too. Notably:

Disabled DHCP client on a PPPoE-provisioned line; I'd get rid of it entirely, not merely disable the defconf one.
UDP timeout on firewall tracking; reset it to the default per my guide.

CGGXANNX · Wed Mar 06, 2024 9:45 am

There are no problems with having both ether1 and pppoe-out1 in the WAN list. DHCP client is already disable for ether1 and there are no /ip address entries for ether1, which means ether1 has no addresses and there are no routes that go through ether1.

The seconde action=masquerade chain=srcnat rule should be removed. RouterOS even put a #no interface comment above it in the export. The rule was probably added when there was an old pppoe-out1 interface defined, then that interface has been deleted and a new pppoe-out1 recreated. But the masquerade rule still has the old interface index which is now no longer valid.

To OP: what is the current Actual MTU value of the pppoe-out1 interface? Have you tried to reduce it? If it's currently 1492, set both Max MTU and Max MRU to 1480, for instance,.to reduce it. If the problem persists, you can try to gradually reduce the value. But if upload at still slow at 1400 then don't go lower, clear the Max MTU and Max MRU values and investigate somewhere else because the issue is probably not MTU-related then.

aoakeley · Thu Mar 07, 2024 3:25 am

Try adding this. Not sure if it will fix it, but it certainly wont hurt.

/ip firewall mangle
add action=change-mss chain=forward new-mss=clamp-to-pmtu passthrough=yes protocol=tcp tcp-flags=syn comment="Clamp MSS to PMTU for Outgoing packets"
add action=change-mss chain=output new-mss=clamp-to-pmtu passthrough=yes protocol=tcp tcp-flags=syn

muttley · Thu Mar 07, 2024 8:38 pm

Many thanks for the input and assistance with this.
Finally got it up and running

ianjay06 · Fri Apr 05, 2024 5:34 am

how did you fix this?

Fri Apr 05, 2024 6:24 am

how did you fix this?

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