Static route issues (was "Can someone try www.gog.com please?")

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#3248814 14-Jun-2024 13:52

Subnet mask is currently 255.255.255.0. If I try to change it to 255.255.255.255 then it fails validation, telling me that my DHCP range (10.0.1.2–10.0.1.200) isn't in the same subnet as the gateway (10.0.1.1). That's what I'd expect, as doesn't a 255.255.255.255 subnet effectively limit the network to a single IP address?

saf

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#3248819 14-Jun-2024 14:14

Behodar:

Subnet mask is currently 255.255.255.0. If I try to change it to 255.255.255.255 then it fails validation, telling me that my DHCP range (10.0.1.2–10.0.1.200) isn't in the same subnet as the gateway (10.0.1.1). That's what I'd expect, as doesn't a 255.255.255.255 subnet effectively limit the network to a single IP address?

Sorry I was meaning the DHCP client if you're using DHCP from Quic, rather than your DHCP server on your LAN. :-)

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#3248821 14-Jun-2024 14:19

I haven't been able to find any other DHCP options. The "connection type" is set to Auto (other options are Manual, PPPoE and DS-Lite). A subnet mask field appears (with a default value of 255.0.0.0) if I choose Manual, but then it's presumably not DHCPing.

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#3248823 14-Jun-2024 14:31

Behodar:

I haven't been able to find any other DHCP options. The "connection type" is set to Auto (other options are Manual, PPPoE and DS-Lite). A subnet mask field appears (with a default value of 255.0.0.0) if I choose Manual, but then it's presumably not DHCPing.

Yeah okay, out of my league of having no experience with Synology networking then sorry! 😂

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#3250964 19-Jun-2024 21:07

saf:

Just a thought... If you're using DHCP and it's a dynamic route, check your DHCP client and see if there's a manual subnet mask set. Subnet mask should be 255.255.255.255 (/32 route).

For what it's worth, switching to PPPoE appears to have resolved (or rather, worked around) the issue. The offending entry is no longer in the routing table and I can access GOG again.

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#3264361 25-Jul-2024 17:16

Can someone advise where I'm supposed to hand my geek card in? Five weeks since I changed this setting, and it took me until last night to realise that I broke IPv6 in the process.

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#3265182 27-Jul-2024 17:07

I've just been having another look at this. I factory reset the router and right off the bat that 118.0.0.0/8 static route popped back into existence. I've still had zero luck with getting rid of it (apart from using PPPoE), and not enough people seem to use Synology around here for them to be any help :(

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#3265256 27-Jul-2024 19:07

That 118.0.0.0/8 is your WAN IP isn't it? 10.0.1.0 and 192.168.2.0 look to be your LANs. How does Quic normally handle DHCP? On 2degrees/Vocus they do a /30 with the adjacent IP pointing to the BNG end.

What do others route tables on Quic look like when doing DHCP?

Or even a packet capture would be better. Surely variable length subnet mask is implicit on a CPE router in 2024 and there's no way you could've turned that off...

Do you have another router you can try?

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#3265257 27-Jul-2024 19:13

Sorry about this but ChatGPT got lost in the weeds.

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#3265277 27-Jul-2024 20:12

yitz:

That 118.0.0.0/8 is your WAN IP isn't it? 10.0.1.0 and 192.168.2.0 look to be your LANs. How does Quic normally handle DHCP? On 2degrees/Vocus they do a /30 with the adjacent IP pointing to the BNG end.

What do others route tables on Quic look like when doing DHCP?

Or even a packet capture would be better. Surely variable length subnet mask is implicit on a CPE router in 2024 and there's no way you could've turned that off...

Do you have another router you can try?

Yep, my WAN IP is in the 118.0.0.0/8 range, but obviously - at least to those of us who aren't a Synology router - isn't the entire /8 :)

10.0.1.0/24 is my "normal" LAN. 192.168.2.0/24 is the "guest" one, which is there by default but I haven't configured it so nothing can connect.

I do have another router but I might not be able to try it for a few days. It wouldn't connect last time I tried it, but I suspect I need to wait 30 minutes for the existing DHCP lease to time out, and I'm a bit too busy to put an hour aside for troubleshooting at the moment (allowing another 30 min to switch back to the Synology).

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#3265282 27-Jul-2024 20:38

To me it looks to be some interoperability issue between Quic's DHCP setup and your Synology router.

In post #3246254 hop 2 is the Quic BNG not your Synology router as your router is hop 1 already. Quic's BNG is not forwarding the packet for some reason with the response !H Host unreachable. I assume because DHCP has negotiated a /8 it assumes its directly connected which of course 118.215.88.211 is not. Quic's IPs are 118.67.192-199.0

If Quic is really handing out 255.255.255.255 as the DHCP subnet mask as per saf's reply #3248810 then that could be the issue although not sure he is correct there. As I said before Vocus is 255.255.255.252 with other IP being gateway address and One NZ use 255.255.255.0 with .254 being the gateway address pointing to the BNG.

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#3265410 28-Jul-2024 07:30

yitz:

If Quic is really handing out 255.255.255.255 as the DHCP subnet mask

I plugged in the old AirPort and that's exactly what it reports:

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#3265518 28-Jul-2024 12:39

It's known some devices don't like having 255.255.255.254 or 255.255.255.255 subnet mask for an Ethernet network and this is presumably the case with the Synology router too. It then seems the Synology router has re-negotiated a 255.0.0.0 subnet mask which is technically fine (other than overlapping into others registered IP space in case your router makes direct connections to other networks using those overlapping ranges) as traffic is still being sent out your fibre connection towards Quic but the Quic BNG has learned this as local traffic as if you're on a multi-site VPN connection rather than forwarding it toward the Internet.

Looks to be something @saf could get Quic network engineering to look into.

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#3265846 29-Jul-2024 13:52

If I change the configuration from Auto to Manual then the subnet mask field is pre-filled with 255.0.0.0 so it looks like your theory could be correct. If I change it to 255.255.255.255 then it rejects the 118.67.199.x address, claiming that it's invalid due to being a broadcast address.

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#3267563 2-Aug-2024 15:28

I logged a ticket with Synology and they connected in via SSH and fixed the issue. The rogue route is no longer listed in the routing table, and I can access 118.x.x.x addresses. I don't yet have any info around what they actually did, but if I can find out then I'll post it here for the benefit of others.

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