Yayzi same subnet routing

Help and support
1

I’ve just noticed something unusual. One of my mate that is also on Yayzi and actually we are both on 213.18.200.0/21 is getting bandwidth limit when watching anything from my plex server, reason for that is that he cannot reach me directly, so plex is tunneling him, limiting his bandwidth to 2mb/s. I’ve tested a few more things and seems yes I cannot route to him either.

This has nothing to do with the migration, other than the fact that after we both landed on the same subnet. Now probably my router is trying to reach him and tries an ARP as is already is in the destionation subnet and that fails of course.

Just wondering if anyone in the yayzi team or the community have any ideas for a fix, other than routing throught a tailscale like network.

2

Usable host range for 213.18.200.0/21 is 213.18.200.1 - 213.18.207.254 so 2000 odd IPs

Are you both routing out of the same gateway if you tracert to each others IP? Usually the second hop, first hop being your own router.

Do the hops look consistent both sides if you do both route out of the same Yayzi Gateway?

3

Yeah, we both have 213.18.200.1 as gateway and I presume everyone in here on that /21 subnet also do. When I trace him or he traces me we both get from our router Destination unreachable, that is why am thinking it tries to arp and that is blocked on the public subnet.

Only solution I can think so far is to hardcode his mac and IP but cannot do that on his side as he is running a tp-link OR ask Yayzi to move one of us in a diffrent subnet, lol.

4

Yeah makes sense if you are both in the same broadcast domain. Im not on that range so not sure how Yayzi manages it, if for example they slice the network up internally into smaller /24s to limit the size of the broadcast domain (or they block arp on the core network), but is still advertised as a /21 prefix externally.

I think you are on the right track though.

1 Like
5

Thanks for taking the time to read through it, I’ll do a bit more investigating, but never thought I would be in a situation when me and one of my mates to be on the same ISP subnet

1 Like
6

I’ll get the network team to take a look at this as well :slightly_smiling_face:

1 Like
8

Making some progress,

I deleted my static autogenerated route and seems I am now getting to the gateway and further when trying to reach an IP in the same subnet. Only issue now is how do I do that on my mates router as he has an tplink EX820v, while i have an openwrt one which was easy.

route del -net 213.18.200.0 netmask 255.255.248.0 dev eth1.911

traceroute 213.18.204.[hidden]
traceroute to 213.18.204.[hidden] (213.18.204.[hidden]), 30 hops max, 60 byte packets
1 router.lan (192.168.2.1) 0.420 ms 0.358 ms 0.319 ms
2 213.18.200.1 (213.18.200.1) 3.133 ms 2.757 ms 3.378 ms
3 * * *