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

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#3267585 2-Aug-2024 16:38

Would be good to know if they fixed an error on your specific device, or put in a place a manual workaround not presented to the GUI. You should be able to get the SSH history if you log back into it yourself.

Behodar

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#3267587 2-Aug-2024 16:44

I suspect the latter (given that the problem persisted through a factory reset). I have asked, but will have a nosey if they don't tell me.

RunningMan

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#3267588 2-Aug-2024 16:55

Sounds like a Synology bug then that they've worked around.

Behodar

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#3267590 2-Aug-2024 17:13

RunningMan:

You should be able to get the SSH history if you log back into it yourself.

Hmm. It's running BusyBox, which apparently saves the history in ~/.ash_history by default... except there's no ~ directory and pwd is / when I first log in (and .ash_history doesn't exist in there).

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#3267672 2-Aug-2024 18:42

RunningMan:

Would be good to know if they fixed an error on your specific device, or put in a place a manual workaround not presented to the GUI. You should be able to get the SSH history if you log back into it yourself.

The answer is that they "fixed the DHCP script", so I'm essentially running a custom firmware now. They haven't explicitly stated it, but I suspect they'll be looking at rolling the fix into an official update.

I might poke around later and see whether I can find which file they changed.

freitasm

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#3341529 11-Feb-2025 15:17

I can confirm this is still happening. I tried to login to work's OpenVPN server today (103.x.x.x) and couldn't. Lots of looking around and found Synology had added a route 103.0.0.0/8 to the table.

Removed it, VPN server back in action. So it seems this is not fixed yet.

freitasm

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#3341533 11-Feb-2025 15:26

I've submitted this as a fault to Synology.

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Behodar

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#3341556 11-Feb-2025 16:21

It's definitely "fixed" at my end since the manual tweak, but I was never able to find out what they actually did, and it seems that it was never rolled into a public firmware update. Hopefully they fix it properly this time instead of just manually tweaking it.

In case it helps, my Synology ticket number was 3638966.

3l3m3nt

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#3342344 13-Feb-2025 10:21

I suspect the issues you are experiencing are related to your routers compatibility with RFC3442 (the addition of a classless static route). Quic uses this RFC when using DHCP.

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#3342351 13-Feb-2025 10:37

@3l3m3nt:

I suspect the issues you are experiencing are related to your routers compatibility with RFC3442 (the addition of a classless static route). Quic uses this RFC when using DHCP.

If the router is compatible with the RFC then it's up to the ISP to look into it to see why it's creating the routes?

3l3m3nt

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#3342359 13-Feb-2025 10:52

Not really. I'd say that rests more on the manufacturer. It's not uncommon for vendors to have poorly implemented RFC's.

Judging from the routing table by the OP's screencap, it looks like it has put a default route in for a gateway at 103.243.102.34, however the IP address received for the interface 118.x.y.z (would have been assigned as a /32) has had the CIDR of /8 added to it instead of a /32 like it should have. While this would still work for the majority of internet tasks, if the OP hits any website that resolves to an endpoint inside 118.0.0.0/8 it'll drop it on the floor.

The RFC3442 allows the ISP to assign an IP as a /32 bit mask, and assign a default gateway outside of that mask (eg. classless)

For example, my Mikrotik RB5009 supports RFC3442 and presents the following routing table..

My IP address is assigned as 103.193.138.xyz/32 with a default gateway of 103.243.102.40/32.

Best bet for a router that doesn't support RFC3442 is to use PPPoE, nag the vendor to fix, or get a new router.

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#3342360 13-Feb-2025 10:53

It makes sense. Thanks. Added this to the Synology ticket.

3l3m3nt

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#3342361 13-Feb-2025 10:58

Actually I think I have that the wrong way around. Looks like the OP's router did process the classless route, but added a /8 CIDR to the IP address received via DHCP instead of giving it a /32 like it should have.

Either way, still points to some weird issue with how it treats the RFC3442

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#3342362 13-Feb-2025 10:59

@3l3m3nt Could you please update your first reply? I've posted a link to it to the Synology ticket and better if they read the udpated version.

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#3342459 13-Feb-2025 11:09

Done.

In the meantime, you could always configure PPPoE which natively classless.

The reason why Quic uses RFC3442 is for a couple of reasons (iirc). It allows more efficient use of IPv4 address space (potentially allows them to avoid using CGNAT) and portability between BNG's, also it allows the ISP to give customers the option of using either PPPoE and DHCP. Having the capability to do both mechanisms requires this.

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