<commit_before># Using SmartM2M VPNs (draft in progress)
The goal is to configure a Linux cluster to keep active a GRE tunnel and receive requests on a _squid_ proxy (http://www.squid-cache.org). This tunnel connects the IoTA infrastructure with the M2M router.

## HA configuration
Activate _ip forwarding_ editing _/etc/sysctl.conf_ (as root if needed):

```<commit_msg>Update VPNs.md<commit_after># Using SmartM2M VPNs (draft in progress)
The goal is to configure a Linux cluster to keep active a GRE tunnel and receive requests on a _squid_ proxy (http://www.squid-cache.org). This tunnel connects the IoTA infrastructure with the M2M router.


## HA configuration
Activate _ip forwarding_ editing _/etc/sysctl.conf_ (as root if needed):

```
{'fraction_non_alphanumeric': 0.07372654155495978, 'fraction_numerical': 0.005361930294906166, 'mean_word_length': 4.746153846153846, 'pattern_counts': {'":': 0, '<': 3, '<?xml version=': 0, '>': 3, 'https://': 0, 'lorem ipsum': 0, 'www.': 2, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
{'dir': 'git-commits-cleaned', 'id': '2296815', 'n_tokens_mistral': 227, 'n_tokens_neox': 210, 'n_words': 101}