Skip to content

IP socket options (TTL / hop-limit / DSCP) — depends on prometheus/exporter-toolkit#396 #1

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
randomizedcoder wants to merge 2 commits into
base: master
Choose a base branch
from
Open

IP socket options (TTL / hop-limit / DSCP) — depends on prometheus/exporter-toolkit#396 #1

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
9bc3de6
docs: add design spec for IP socket options (TTL, hop-limit, DSCP)
randomizedcoder May 28, 2026
c266744
README + go.mod for IP socket-options (pre-release testing)
randomizedcoder May 28, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
19 changes: 19 additions & 0 deletions README.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -396,6 +396,25 @@ The exporter supports TLS via a new web configuration file.

See the [exporter-toolkit web-configuration](https://github.com/prometheus/exporter-toolkit/blob/master/docs/web-configuration.md) for more details.

## IP socket options (TTL, hop limit, DSCP)

The exporter can clamp the IPv4 TTL / IPv6 Hop Limit and set the DSCP codepoint
on packets leaving its listening socket. Configurable via flag, environment
variable, or the `--web.config.file` YAML.

```console
# Defense-in-depth: TTL=2 means scrape responses cannot escape past the
# second router hop, even if firewalls or ACLs ever fail open.
./node_exporter --web.ipv4-ttl=2 --web.ipv6-hop-limit=2

# QoS marking: classify scrape traffic as CS2 (DSCP 16) so intermediate
# equipment queues it correctly.
./node_exporter --web.dscp=16
```

See [docs/IP_SOCKET_CONFIG.md](docs/IP_SOCKET_CONFIG.md) for the full design,
configuration surface, and platform support matrix.

[travis]: https://travis-ci.org/prometheus/node_exporter
[hub]: https://hub.docker.com/r/prom/node-exporter/
[circleci]: https://circleci.com/gh/prometheus/node_exporter
Expand Down
Loading