zero cltv delta

[xraid]

what is the purpose of having channels in C-Ligtning with zerp cltv delta ?

2021-10-18 12:15:15.864 [WRN] CRTR: Channel 680420676405231616 has zero cltv delta

its a testtest alias at https://github.com/rootzoll/raspiblitz

C-Lightning 0206e0777f02393bb60e09f1bfeb9b95024ba661c8415e98a1ab87c86afe960d8c


lncli getchaninfo  680420676405231616
{
    "channel_id": "680420676405231616",
    "chan_point": "9e1324c273538ee0ad8d5124d652575ddcadddf933132f1c5f35bb6177710db2:0",
    "last_update": 1634602988,
    "node1_pub": "0206e0777f02393bb60e09f1bfeb9b95024ba661c8415e98a1ab87c86afe960d8c",
    "node2_pub": "0331f80652fb840239df8dc99205792bba2e559a05469915804c08420230e23c7c",
    "capacity": "1000000",
    "node1_policy": {
        "time_lock_delta": 0,
        "min_htlc": "0",
        "fee_base_msat": "0",
        "fee_rate_milli_msat": "0",
        "disabled": false,
        "max_htlc_msat": "1000000000",
        "last_update": 1592833248
    },
    "node2_policy": {
        "time_lock_delta": 40,
        "min_htlc": "1",
        "fee_base_msat": "0",
        "fee_rate_milli_msat": "1000",
        "disabled": false,
        "max_htlc_msat": "990000000",
        "last_update": 1634602988
    }
}

[openoms]

More context please, is the CL channel on a raspiblitz or is this just a general lightning question?

https://lightningwiki.net/index.php/Delays

See the discussion:
lightningnetwork/lnd#1523

Should not be able to set 0:

You can't have a value of 0 for the CLTV delta. If you did, then you'd be exposed to losing funds on each HTLC you forward, as a race condition is introduced if you ever need to go to the chain for an outgoing HTLC.

Default:
https://github.com/lightningnetwork/lnd/blob/e6c65f1cbd5a7f3f1aed7b5ef7720a7112156d78/sample-lnd.conf#L506

Set with:

$ lncli updatechanpolicy -h
NAME:
   lncli updatechanpolicy - Update the channel policy for all channels, or a single channel.

USAGE:
   lncli updatechanpolicy [command options] base_fee_msat fee_rate time_lock_delta [--max_htlc_msat=N] [channel_point]

CATEGORY:
   Channels

DESCRIPTION:
   
  Updates the channel policy for all channels, or just a particular channel
  identified by its channel point. The update will be committed, and
  broadcast to the rest of the network within the next batch.
  Channel points are encoded as: funding_txid:output_index

OPTIONS:
   --base_fee_msat value    the base fee in milli-satoshis that will be charged for each forwarded HTLC, regardless of payment size (default: 0)
   --fee_rate value         the fee rate that will be charged proportionally based on the value of each forwarded HTLC, the lowest possible rate is 0 with a granularity of 0.000001 (millionths)
   --time_lock_delta value  the CLTV delta that will be applied to all forwarded HTLCs (default: 0)
   --min_htlc_msat value    if set, the min HTLC size that will be applied to all forwarded HTLCs. If unset, the min HTLC is left unchanged. (default: 0)
   --max_htlc_msat value    if set, the max HTLC size that will be applied to all forwarded HTLCs. If unset, the max HTLC is left unchanged. (default: 0)
   --chan_point value       The channel whose fee policy should be updated, if nil the policies for all channels will be updated. Takes the form of: txid:output_index

[xraid]

Your channel 680420676405231616 has zero cltv delta

[xraid]

why ?

[xraid]

is that context clear ?

[openoms]

I am not in control of that node and don't know why the CLTV delta is 0.
The node has it's last update a year ago so I consider it abandoned.

Are you just asking here because the node owner links to this repo on 1ml.com?

https://1ml.com/node/0206e0777f02393bb60e09f1bfeb9b95024ba661c8415e98a1ab87c86afe960d8c