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tstuart's avatar
tstuart
Neighbour
1 day ago

TELUS Business Internet — selective IPv4 destinations unreachable while others work

Seeing what looks like a selective upstream routing/blackhole issue on TELUS Business Internet in the Spruce Grove/Edmonton area tonight.

The circuit is up. Static IPv4 /30; TELUS gateway is reachable with essentially no loss. However, some Internet destinations are completely unreachable while others work normally.

Directly from OPNsense: 1.1.1.1, 8.8.8.8 and 9.9.9.9 all have 100% loss. Google IP 74.125.195.102 also has 100% loss and TCP/443 times out, while Google IP 142.250.69.174 has 0% loss and TCP/443 succeeds normally. Both Google IPs use the same WAN interface, default route and TELUS gateway.

I also captured traffic on the physical Proxmox NIC connected to the TELUS handoff. Traffic to 74.125.195.102 physically leaves the WAN NIC toward the TELUS next-hop MAC, but nothing returns. Traffic to 142.250.69.174 leaves through the same NIC/next-hop and immediately receives ICMP replies and TCP SYN/ACKs.

Local causes have been checked: OPNsense routing/default gateway is correct, CrowdSec is not blocking the affected IPs, Proxmox nftables/iptables/ebtables/tc are clear, and the physical NIC has zero RX/TX errors or discards. The issue also reproduces directly from OPNsense.

DNS was collateral damage. Unbound normally forwards over DoT to Cloudflare 1.1.1.2/1.0.0.2, which also became unreachable. Disabling those forwarders and using recursive DNS restored most service, but selective IPv4 reachability remains.

And just to top it off, the password I have recorded for my TELUS ONT no longer works. I tried resetting it and using the default credentials afterward, but still cannot access the ONT management interface.

Anyone else on TELUS, particularly Business Internet in Alberta, seeing selective destination/prefix reachability tonight?

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