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Update docs about tunnel stuff

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2025-12-19 12:13:46 -05:00
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3 changed files with 51 additions and 43 deletions
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6
manage/resources/private/alias.mdx
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@@ -3,7 +3,7 @@ title: "Aliases"
description: "Set a friendly alias hostname that resolves to a host"
---
Aliases provide a secondary, user-friendly address for any of your Resources, allowing users to access the Resource using this alternate name in addition to the original address.
Aliases provide a secondary, user-friendly address for any of your Resources, allowing users to access the Resource using this alternate name in addition to the original address.
For instance, a router with the address `10.0.0.1` could be assigned the alias `router.internal`, and users could connect using either. Aliases are accessible to anyone who has access to the Resource, and they are exclusively accessible when connected with a Pangolin client, meaning they function without requiring any external DNS record setup. Furthermore, aliases are protocol agnostic, which means they will work with any network protocol, essentially acting as a pseudo-A record for an address that is only functional within the Pangolin environment.
@@ -17,7 +17,9 @@ Since aliases cannot be single-label domains, you must avoid using domain names
## Custom Upstream DNS
Aliases work by overriding the DNS of your computer running the client so that all DNS requests are sent to the Pangolin client for resolution. The dns server on your computer is typically `100.96.128.1` which will forward request to an upstream server. By default, we use `9.9.9.9`, but this upstream address can be configured using [the flag](/manage/clients/configure-client) in the CLI / Olm or in the client settings.
Aliases work by overriding the DNS of your computer running the client so that all DNS requests are sent to the Pangolin client for resolution. The dns server on your computer is typically `100.96.128.1` (the first address inside of your utility subnet on the org) when connected to the tunnel which will forward request to an upstream server. By default, we use `9.9.9.9`, but this upstream address can be configured using [the flag](/manage/clients/configure-client) in the CLI / Olm or in the client settings.
**If you are attempting to set an upstream DNS server that is only accessible via the tunnel, ensure that you create a resource and check the tunnel DNS option in the client configuration settings or use the --tunnel-dns flag.** Otherwise, connectivity to the server may fail when connected to the tunnel.
## Disable Aliases

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manage/resources/private/destinations.mdx
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@@ -26,9 +26,9 @@ Pangolin smooths away overlapping networks and arbitrarily chooses a single site
It is recommended that you create overlapping resources only if absolutely required. If you do, use [Aliases](/manage/resources/private/alias) to explicitly defined which host should be used for a given FQDN or IP address and use the alias to connect.
## Why is ICMP Pinging Not Working?
## ICMP End to End?
Because Newt sites are proxying traffic out of the secure tunnel, ICMP needs to be handled specially just like UDP and TCP. Right now, ICMP **is not supported** through the Pangolin client. If you need to ping hosts on the remote network, consider using TCP or UDP-based tools like `hping3` or `nping` as alternatives. We plan to add ICMP support in a future release.
Pangolin supports testing connectivity to Resources using ICMP ping requests. However, it's important to note that while the Pangolin client can send ICMP echo requests to the destination, the actual ping request is captured and replayed from the Newt binary to the actually destination. This means that requests are not end to end but are still an effective way to test connectivity to a resource.
## Unicast Only?