i2pd configuration

i2pd can be configured via either command-line arguments or config files. Modifying i2pd.conf is just a way of passing command line arguments to i2pd at boot; for example, running i2pd with argument --port=10123 and setting option port = 10123 in config file will have the same effect.

There are two separate config files: i2pd.conf and tunnels.conf. i2pd.conf is the main configuration file, where you configure all options. tunnels.conf is the tunnel configuration file, where you configure I2P hidden services and client tunnels. the tunnels.conf options are documented here.

i2pd.conf accepts INI-like syntax, such as the following : = . Comments are "#", not ";" as you might expect. See boost ticket All command-line parameters are allowed as keys, but for those which contains dot (.), there is a special syntax.

For example:


# comment
log = true # use stdout (default)
ipv6 = true
# settings for specific module
port = 4444
# ^^ this will be --httproxy.port= in cmdline
# another comment
enabled = true

You are also encouraged to see the commented config with examples of all options in contrib/i2pd.conf.

Options specified on the command line take precedence over those in the config file. If you are upgrading your very old router (< 2.3.0) see also this page.

Available options

Run ./i2pd --help to show builtin help message (default value of option will be shown in braces)

General options

Option Description
conf Config file (default: ~/.i2pd/i2pd.conf or /var/lib/i2pd/i2pd.conf). This parameter will be silently ignored if the specified config file does not exist.
tunconf Tunnels config file (default: ~/.i2pd/tunnels.conf or /var/lib/i2pd/tunnels.conf)
pidfile Where to write pidfile (default: i2pd.pid, not used in Windows)
log Logs destination: stdout, file, syslog (stdout if not set or invalid) (if daemon, stdout/unspecified are replaced by file in some cases)
logfile Path to logfile (default - autodetect)
loglevel Log messages above this level (debug, info, warn, error, none; default - warn)
logclftime Write full CLF-formatted date and time to log (default: false (write only time))
datadir Path to storage of i2pd data (RouterInfos, destinations keys, peer profiles, etc ...)
host Router external IP for incoming connections (default: auto if SSU2 is enabled)
port Port to listen for incoming connections (default: auto (random))
daemon Router will go to background after start (default: true)
service Router will use system folders like '/var/lib/i2pd' (on unix) or 'C:\ProgramData\i2pd' (on Windows). Ignored on MacOS and Android (default: false)
ifname Network interface to bind to
ifname4 Network interface to bind to for IPv4
ifname6 Network interface to bind to for IPv6
address4 Local address to bind to for IPv4
address6 Local address to bind to for clearnet IPv6
nat If true, assume we are behind NAT (default: true)
ipv4 Enable communication through IPv4 (default: true)
ipv6 Enable communication through clearnet IPv6 (default: false)
notransit Router will not accept transit tunnels, disabling transit traffic completely. G router cap will be published (default: false)
floodfill Router will be floodfill (default: false)
bandwidth Bandwidth limit: integer in KBps or letters: L (32), O (256), P (2048), X (unlimited).
share Max % of bandwidth limit for transit. 0-100 (default: 100)
family Name of a family, router belongs to
netid Network ID, router belongs to. Main I2P is 2.


datadir and service options are only used as arguments for i2pd, these options have no effect when set in i2pd.conf.


Option Description
ntcp2.enabled Enable NTCP2 (default: true)
ntcp2.published Enable incoming NTCP2 connections (default: true)
ntcp2.port Port to listen for incoming NTCP2 connections (default: auto - port from general section)
ntcp2.addressv6 External IPv6 for incoming connections
ntcp2.proxy Specify proxy server for NTCP2. Should be http://address:port or socks://address:port


Option Description
ssu2.enabled Enable SSU2 (default: true)
ssu2.published Enable incoming SSU2 connections. (default: true)
ssu2.port Port to listen for incoming SSU2 connections (default: auto - 'port' from general section)
ssu2.proxy Specify UDP socks5 proxy server for NTCP2. Should be socks://address:port
ssu2.mtu4 MTU for local ipv4. (default: auto)
ssu2.mtu6 MTU for local ipv6. (default: auto)

All options below still possible in cmdline, but better write it in config file:

HTTP webconsole

Option Description
http.enabled If webconsole is enabled. (default: true)
http.address The address to listen on (HTTP server)
http.port The port to listen on (HTTP server) (default: 7070)
http.auth Enable basic HTTP auth for webconsole (default: false)
http.user Username for basic auth (default: i2pd)
http.pass Password for basic auth (default: random, see logs)
http.strictheaders Enable strict host checking on WebUI. (default: true)
http.hostname Expected hostname for WebUI (default: localhost)

HTTP proxy

Option Description
httpproxy.enabled If HTTP proxy is enabled. (default: true)
httpproxy.address The address to listen on (HTTP Proxy)
httpproxy.port The port to listen on (HTTP Proxy) (default: 4444)
httpproxy.addresshelper Enable address helper (jump). (default: true)
httpproxy.keys Optional keys file for HTTP proxy local destination
httpproxy.signaturetype Signature type for new keys if keys file is set. (default: 7)
httpproxy.inbound.length Inbound tunnels length if keys is set. (default: 3)
httpproxy.inbound.quantity Inbound tunnels quantity if keys is set. (default: 5)
httpproxy.inbound.lengthVariance Inbound tunnels length variance if keys is set. (default: 0)
httpproxy.outbound.length Outbound tunnels length if keys is set. (default: 3)
httpproxy.outbound.quantity Outbound tunnels quantity if keys is set. (default: 5)
httpproxy.outbound.lengthVariance Outbound tunnels length variance if keys is set. (default: 0)
httpproxy.outproxy HTTP proxy upstream out proxy url (like http://false.i2p)
httpproxy.i2cp.leaseSetType Type of LeaseSet to be sent. 1, 3 or 5. (default: 3)
httpproxy.i2cp.leaseSetEncType Comma separated encryption types to be used in LeaseSet type 3 or 5

Socks proxy

Option Description
socksproxy.enabled If SOCKS proxy is enabled. (default: true)
socksproxy.address The address to listen on (SOCKS Proxy)
socksproxy.port The port to listen on (SOCKS Proxy). (default: 4447)
socksproxy.keys Optional keys file for SOCKS proxy local destination
socksproxy.signaturetype Signature type for new keys if keys file is set. (default: 7)
socksproxy.inbound.length Inbound tunnels length if keys is set. (default: 3)
socksproxy.inbound.quantity Inbound tunnels quantity if keys is set. (default: 5)
socksproxy.inbound.lengthVariance Inbound tunnels length variance if keys is set. (default: 0)
socksproxy.outbound.length Outbound tunnels length if keys is set. (default: 3)
socksproxy.outbound.quantity Outbound tunnels quantity if keys is set. (default: 5)
socksproxy.outbound.lengthVariance Outbound tunnels length variance if keys is set. (default: 0)
socksproxy.outproxy.enabled Enable or disable SOCKS5 outproxy. (default: false)
socksproxy.outproxy Address of outproxy(IP or local). Requests outside I2P will go there.
socksproxy.outproxyport Outproxy port. If 0 socksproxy.outproxy contains path to local socket
socksproxy.i2cp.leaseSetType Type of LeaseSet to be sent. 1, 3 or 5. (default: 3)
socksproxy.i2cp.leaseSetEncType Comma separated encryption types to be used in LeaseSet type 3 or 5

SAM interface

Option Description
sam.enabled If SAM is enabled. (default: true)
sam.address The address to listen on (SAM bridge)
sam.port Port of SAM bridge. Usually 7656. SAM is off if not specified
sam.singlethread If false every SAM session runs in own thread. (default: true)

BOB interface

Option Description
bob.enabled If BOB is enabled. (default: false)
bob.address The address to listen on (BOB command channel)
bob.port Port of BOB command channel. Usually 2827. BOB is off if not specified

I2CP interface

Option Description
i2cp.enabled If I2CP is enabled. (default: true)
i2cp.address The address to listen on or an abstract address for Android LocalSocket
i2cp.port Port of I2CP server. Usually 7654. Ignored for Andorid
i2cp.singlethread If false every I2CP session runs in own thread. (default: true)

I2PControl interface

Option Description
i2pcontrol.enabled If I2P control is enabled. (default: false)
i2pcontrol.address The address to listen on (I2P control service)
i2pcontrol.port Port of I2P control service. Usually 7650. I2PControl is off if not specified
i2pcontrol.password I2P control authentication password. (default: itoopie)
i2pcontrol.cert I2P control HTTPS certificate file name. (default: i2pcontrol.crt.pem)
i2pcontrol.key I2P control HTTPS certificate key file name. (default: i2pcontrol.key.pem)


Option Description
upnp.enabled Enable or disable UPnP, false by default for CLI and true for GUI (Windows, Android)
upnp.name Name i2pd appears in UPnP forwardings list. (default: I2Pd)


Option Description
precomputation.elgamal Use ElGamal precomputated tables. (default: false for x86-64 and true for other platforms)


Option Description
reseed.verify Verify .su3 signature. (default: false)
reseed.urls Reseed URLs, separated by comma
reseed.yggurls Reseed Yggdrasil's URLs, separated by comma
reseed.file Path to local .su3 file or HTTPS URL to reseed from
reseed.zipfile Path to local .zip file to reseed from
reseed.threshold Minimum number of known routers before requesting reseed. (default: 25)
reseed.proxy Url for https/socks reseed proxy

Addressbook options

Option Description
addressbook.defaulturl AddressBook subscription URL. Only used to initialize the AddressBook.
addressbook.subscriptions AddressBook subscriptions URLs, separated by comma. Note that defaulturl is not added to subscriptions URLs
addressbook.hostsfile File to dump AddressesBook in hosts.txt format


Option Description
limits.transittunnels Override maximum number of transit tunnels. (default: 10000)
limits.openfiles Limit number of open file descriptors (default: 0 - use system limit)
limits.coresize Maximum size of corefile in Kb (default: 0 - use system limit)
limits.zombies Minimum percentage of successfully created tunnels under which tunnel cleanup is paused (default [%]: 0.00)

Trust options

Option Description
trust.enabled Enable explicit trust options. (default: false)
trust.family Make direct I2P connections only to routers in specified Family.
trust.routers Make direct I2P connections only to routers specified here. Comma separated list of base64 identities.
trust.hidden Should we hide our router from other routers? (default: false)

Exploratory tunnels

Option Description
exploratory.inbound.length Exploratory inbound tunnels length. (default: 2)
exploratory.inbound.quantity Exploratory inbound tunnels quantity. (default: 3)
exploratory.outbound.length Exploratory outbound tunnels length. (default: 2)
exploratory.outbound.quantity Exploratory outbound tunnels quantity. (default: 3)

Time sync

Option Description
nettime.enabled Enable NTP sync. (default: false)
nettime.ntpservers Comma-separated list of NTP server. (default: pool.ntp.org)
nettime.ntpsyncinterval NTP time sync interval in hours. (default: 72)

Network information persist

Option Description
persist.profiles Enable peer profile persisting to disk. (default: true)

Meshnets transports

Option Description
meshnets.yggdrasil Support transports through the Yggdrasil (default: false)
meshnets.yggaddress Local Yggdrasil's address to publish

Windows-specific options

Option Description
insomnia Prevent system from sleeping
close Action on close: minimize, exit, ask

UNIX-specific options

Option Description
unix.handle_sigtstp Handle SIGTSTP and SIGCONT signals. (default: false)

handle_sigtstp enables handling of SIGTSTP and SIGCONT signals (since 2.43.0).

SIGTSTP can be called using Ctrl+Z in terminal with running i2pd in it or by kill command. When signal recveived, i2pd will switch to offline mode and stop sending traffic and cleaning of netDb. All active tunnels will be frozen.

To restore network connectivity you need to send SIGCONT signal to the proccess. Tunnels will be cleared if they should expire during the frozen state and new ones will be built.

Local addressbook

There is also a special addressbook config file in the working directory at addressbook/local.csv. It lets your routers to work as a resolver for 3ld domains if you run that 2ld address on your router and it' presented in addressbook. Only i2pd can resolve such addresses, by sending special datagram requests.