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Forums › LAN (ethernet/Wifi/routers/Bluetooth) › Hotshot ISP with OpenWRT. Anyone using Openwrt Router with them. Having config issues
SublimeSerpent

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#317507 22-Oct-2024 19:51
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I'm with Hotshot ISP. I've been trying to get my openwrt router connected directly to the ONT, but no dice. Also tried the original firmware that came from the manufacturer.

 

Their custom router settings seem a bit weird compared to other NZ ISPs. They want VLAN disabled, VLAN tagging as 'untagged', VLAN priority as 0, DNS: Dynamic,  MTU 1492, MSS 1452. 

 

Just wondering if there are other geeks out there using this ISP and connecting with an openWRT router, and if so, can you share your secrets for connecting.

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freitasm
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  #3300123 22-Oct-2024 19:53
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And is this using PPPOE or DHCP?




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SublimeSerpent

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  #3300124 22-Oct-2024 19:54
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PPPoe

fe31nz
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  #3300167 22-Oct-2024 23:52
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If Hotshot do IPv6, then they really need to support MTU 1500 for PPPoE.  Even with IPv4, MTU 1492 is a real compromise - large packets will have to be fragmented into two smaller packets, and that means those packets will be handled by the CPU as the router hardware does not do fragmentation.  Depending on how good the CPU in the router is, it may not be able to do PPPoE and fragmenting of large packets at the same time and will slow down the traffic.  So I would not recommend any ISP that uses PPPoE and does not support MTU 1500.  If your fibre is from Chorus, they have the connections overprovisioned to MTU 1508 at the Ethernet level so that MTU 1500 over PPPoE will work.  I would hope that all the other NZ fibre providers do that also.  After that, it is up to the ISP and your router to support MTU 1500 over PPPoE.

 

With OpenWRT routers, you should have command line access somewhere and be able to use tcpdump (or install the better tshark program and use that).  Then you can capture the packets as the connection is negotiated and see exactly what is going wrong.  This does require a fairly good knowlege of TCP/IP and the PPPoE protocol.  Or you could post the dumped packets for us to have look at and see what the problem is.

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