Bonjour à tous,

J'ai un petit soucis concernant openssh. J'ai quelques petits ralentissements assez pénibles lorsque je me connecte par SSH à mon serveur distant.

Il ne me semble pas que le problème vienne du serveur vu que je n'ai aucun de ces problèmes quand je me connecte depuis Windows, WSL ou même termux sur android.

J'ai quand même désactivé DNS sur mon serveur et d'autre recommandations que j'ai trouvé en cherchant, j'ai même essayé plusieurs terminaux; mais rien y fait, j'ai toujours ces petites saccades agaçantes quand je tape des commandes ou que je navigue dans mes dossier avec nnn ou ranger par exemple.

Si quelqu'un pouvait m'aider. Merci beaucoup.
Utilise ssh avec l’option -v afin de voir ce qu'il se passe.
Oui, le plus embêtant c'est que je n'ai pas de message d'erreur.
OpenSSH_8.4p1, OpenSSL 1.1.1i FIPS  8 Dec 2020
debug1: Reading configuration data /etc/ssh/ssh_config
debug3: /etc/ssh/ssh_config line 55: Including file /etc/ssh/ssh_config.d/50-redhat.conf depth 0
debug1: Reading configuration data /etc/ssh/ssh_config.d/50-redhat.conf
debug2: checking match for 'final all' host phromaj.b0tnet.com originally phromaj.b0tnet.com
debug3: /etc/ssh/ssh_config.d/50-redhat.conf line 3: not matched 'final'
debug2: match not found
debug3: /etc/ssh/ssh_config.d/50-redhat.conf line 5: Including file /etc/crypto-policies/back-ends/openssh.config depth 1 (parse only)
debug1: Reading configuration data /etc/crypto-policies/back-ends/openssh.config
debug3: gss kex names ok: [gss-curve25519-sha256-,gss-nistp256-sha256-,gss-group14-sha256-,gss-group16-sha512-]
debug3: kex names ok: [curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512]
debug1: configuration requests final Match pass
debug1: re-parsing configuration
debug1: Reading configuration data /etc/ssh/ssh_config
debug3: /etc/ssh/ssh_config line 55: Including file /etc/ssh/ssh_config.d/50-redhat.conf depth 0
debug1: Reading configuration data /etc/ssh/ssh_config.d/50-redhat.conf
debug2: checking match for 'final all' host
debug3: /etc/ssh/ssh_config.d/50-redhat.conf line 3: matched 'final'
debug2: match found
debug3: /etc/ssh/ssh_config.d/50-redhat.conf line 5: Including file /etc/crypto-policies/back-ends/openssh.config depth 1
debug1: Reading configuration data /etc/crypto-policies/back-ends/openssh.config
debug3: gss kex names ok: [gss-curve25519-sha256-,gss-nistp256-sha256-,gss-group14-sha256-,gss-group16-sha512-]
debug3: kex names ok: [curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512]
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> '/home/lucas/.ssh/known_hosts'
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> '/home/lucas/.ssh/known_hosts2'
debug2: resolving  port 22
debug2: ssh_connect_direct
debug1: Connecting to 
debug1: Connection established.
debug1: identity file /home/lucas/.ssh/id_rsa type 0
debug1: identity file /home/lucas/.ssh/id_rsa-cert type -1
debug1: identity file /home/lucas/.ssh/id_dsa type -1
debug1: identity file /home/lucas/.ssh/id_dsa-cert type -1
debug1: identity file /home/lucas/.ssh/id_ecdsa type -1
debug1: identity file /home/lucas/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/lucas/.ssh/id_ecdsa_sk type -1
debug1: identity file /home/lucas/.ssh/id_ecdsa_sk-cert type -1
debug1: identity file /home/lucas/.ssh/id_ed25519 type -1
debug1: identity file /home/lucas/.ssh/id_ed25519-cert type -1
debug1: identity file /home/lucas/.ssh/id_ed25519_sk type -1
debug1: identity file /home/lucas/.ssh/id_ed25519_sk-cert type -1
debug1: identity file /home/lucas/.ssh/id_xmss type -1
debug1: identity file /home/lucas/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.4
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.9p1 Debian-10+deb10u2
debug1: match: OpenSSH_7.9p1 Debian-10+deb10u2 pat OpenSSH* compat 0x04000000
debug2: fd 4 setting O_NONBLOCK
debug1: Authenticating to phromaj.b0tnet.com:22 as 'lucas'
debug3: hostkeys_foreach: reading file "/home/lucas/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/lucas/.ssh/known_hosts:2
debug3: load_hostkeys: loaded 1 keys from phromaj.b0tnet.com
debug3: order_hostkeyalgs: have matching best-preference key type ecdsa-sha2-nistp256-cert-v01@openssh.com, using HostkeyAlgorithms verbatim
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,ext-info-c
debug2: host key algorithms: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ecdsa-sha2-nistp256@openssh.com,ssh-ed25519,sk-ssh-ed25519@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes256-ctr,aes128-gcm@openssh.com,aes128-ctr
debug2: ciphers stoc: aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes256-ctr,aes128-gcm@openssh.com,aes128-ctr
debug2: MACs ctos: hmac-sha2-256-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha2-256,hmac-sha1,umac-128@openssh.com,hmac-sha2-512
debug2: MACs stoc: hmac-sha2-256-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha2-256,hmac-sha1,umac-128@openssh.com,hmac-sha2-512
debug2: compression ctos: none,zlib@openssh.com,zlib
debug2: compression stoc: none,zlib@openssh.com,zlib
debug2: languages ctos: 
debug2: languages stoc: 
debug2: first_kex_follows 0 
debug2: reserved 0 
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1
debug2: host key algorithms: rsa-sha2-512,rsa-sha2-256,ssh-rsa,ecdsa-sha2-nistp256,ssh-ed25519
debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib@openssh.com
debug2: compression stoc: none,zlib@openssh.com
debug2: languages ctos: 
debug2: languages stoc: 
debug2: first_kex_follows 0 
debug2: reserved 0 
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: aes256-gcm@openssh.com MAC: <implicit> compression: none
debug1: kex: client->server cipher: aes256-gcm@openssh.com MAC: <implicit> compression: none
debug1: kex: curve25519-sha256 need=32 dh_need=32
debug1: kex: curve25519-sha256 need=32 dh_need=32
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:
debug3: hostkeys_foreach: reading file "/home/lucas/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/lucas/.ssh/known_hosts:2
debug3: load_hostkeys: loaded 1 keys from phromaj.b0tnet.com
debug3: hostkeys_foreach: reading file "/home/lucas/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/lucas/.ssh/known_hosts:2
debug3: load_hostkeys: loaded 1 keys from 82.124.142.0
debug1: Host 'phromaj.b0tnet.com' is known and matches the ECDSA host key.
debug1: Found key in /home/lucas/.ssh/known_hosts:2
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey out after 4294967296 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey in after 4294967296 blocks
debug1: Will attempt key: /home/lucas/.ssh/id_rsa
debug1: Will attempt key: /home/lucas/.ssh/id_dsa 
debug1: Will attempt key: /home/lucas/.ssh/id_ecdsa 
debug1: Will attempt key: /home/lucas/.ssh/id_ecdsa_sk 
debug1: Will attempt key: /home/lucas/.ssh/id_ed25519 
debug1: Will attempt key: /home/lucas/.ssh/id_ed25519_sk 
debug1: Will attempt key: /home/lucas/.ssh/id_xmss 
debug2: pubkey_prepare: done
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521>
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey,password
debug3: start over, passed a different list publickey,password
debug3: preferred gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering public key: /home/lucas/.ssh/id_rsa RSA SHA256:
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 60
debug1: Server accepts key: /home/lucas/.ssh/id_rsa RSA SHA256:
debug3: sign_and_send_pubkey: RSA SHA256:
debug3: sign_and_send_pubkey: signing using rsa-sha2-256
SHA256:
debug3: send packet: type 50
debug3: receive packet: type 52
debug1: Authentication succeeded (publickey).
Authenticated to .
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug3: send packet: type 90
debug1: Requesting no-more-sessions@openssh.com
debug3: send packet: type 80
debug1: Entering interactive session.
debug1: pledge: network
debug3: receive packet: type 80
debug1: client_input_global_request: rtype hostkeys-00@openssh.com want_reply 0
debug3: receive packet: type 4
debug1: Remote: /home/lucas/.ssh/authorized_keys:1: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding
debug3: receive packet: type 4
debug1: Remote: /home/lucas/.ssh/authorized_keys:1: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding
debug3: receive packet: type 91
debug2: channel_input_open_confirmation: channel 0: callback start
debug2: fd 4 setting TCP_NODELAY
debug3: ssh_packet_set_tos: set IP_TOS 0x48
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
debug3: send packet: type 98
debug1: Sending environment.
debug3: Ignored env COLORTERM
debug3: Ignored env DBUS_SESSION_BUS_ADDRESS
debug3: Ignored env DESKTOP_SESSION
debug3: Ignored env DISPLAY
debug3: Ignored env EDITOR
debug3: Ignored env GDMSESSION
debug3: Ignored env GTK_MODULES
debug3: Ignored env HOME
debug3: Ignored env IMSETTINGS_INTEGRATE_DESKTOP
debug3: Ignored env IMSETTINGS_MODULE
debug1: Sending env LANG = fr_FR.utf8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env LOGNAME
debug3: Ignored env LS_COLORS
debug3: Ignored env PATH
debug3: Ignored env PWD
debug3: Ignored env QT_IM_MODULE
debug3: Ignored env SESSION_MANAGER
debug3: Ignored env SHELL
debug3: Ignored env SHLVL
debug3: Ignored env SSH_AGENT_PID
debug3: Ignored env SSH_AUTH_SOCK
debug3: Ignored env TERM
debug3: Ignored env USER
debug3: Ignored env VTE_VERSION
debug3: Ignored env WINDOWID
debug3: Ignored env XAUTHORITY
debug3: Ignored env XDG_CONFIG_DIRS
debug3: Ignored env XDG_CURRENT_DESKTOP
debug3: Ignored env XDG_DATA_DIRS
debug3: Ignored env XDG_GREETER_DATA_DIR
debug3: Ignored env XDG_MENU_PREFIX
debug3: Ignored env XDG_RUNTIME_DIR
debug3: Ignored env XDG_SEAT
debug3: Ignored env XDG_SEAT_PATH
debug3: Ignored env XDG_SESSION_CLASS
debug3: Ignored env XDG_SESSION_DESKTOP
debug3: Ignored env XDG_SESSION_ID
debug3: Ignored env XDG_SESSION_PATH
debug3: Ignored env XDG_SESSION_TYPE
debug3: Ignored env XDG_VTNR
debug1: Sending env XMODIFIERS = @im=ibus
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug2: channel 0: request shell confirm 1
debug3: send packet: type 98
debug2: channel_input_open_confirmation: channel 0: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: PTY allocation request accepted on channel 0
debug2: channel 0: rcvd adjust 2097152
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: shell request accepted on channel 0
Tu as aussi l'option -C ( compression) qui permet une communication plus fluide. Elle est peut être insérée d'office sur tes autres applis 
man ssh
Bonsoir, c'est encore pire avec cette option. :lol:
14 jours plus tard
Je tombe dans le même problème. SSH devient extrêmement lent.
C'est très bizarre, j'ai fait presque la même installation avec le même environnement sous Arch Linux et je n'ai aucun problème de latence ou lenteur...
Oui ma conf date de vieux, et le problème est devenu ressent sans rien changer. Même une liaison sur LAN reste très lente, voir à l'arrêt. Je veux dire par là qu'internet n'est pas en cause. Tu as fait la même constatation puisque qu'en changeant de distrib tu as retrouvé un débit normal. Maintenant la grosse différence avec Arch c'est le secureBoot.
EDIT: c'est peut être le même problème que j'ai pour me connecter
sur un autre fedora 
ssh isabelle
ssh: connect to host sauvegarde port 1956: No route to host
et sur un raspi debian 
ssh sauvegarde
Linux raspi-thierry 5.4.83+ #1379 Mon Dec 14 13:06:05 GMT 2020 armv6l

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Wed Jan 27 14:53:15 2021 from 185.189.22.110
Tous les 2 ayant la même ip car sur la même box.

Il y a peut être un problème de pare feu. 
sudo iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination         
LIBVIRT_INP  all  --  anywhere             anywhere            

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         
LIBVIRT_FWX  all  --  anywhere             anywhere            
LIBVIRT_FWI  all  --  anywhere             anywhere            
LIBVIRT_FWO  all  --  anywhere             anywhere            

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         
LIBVIRT_OUT  all  --  anywhere             anywhere            

Chain LIBVIRT_FWI (1 references)
target     prot opt source               destination         
ACCEPT     all  --  anywhere             192.168.122.0/24     ctstate RELATED,ESTABLISHED
REJECT     all  --  anywhere             anywhere             reject-with icmp-port-unreachable

Chain LIBVIRT_FWO (1 references)
target     prot opt source               destination         
ACCEPT     all  --  192.168.122.0/24     anywhere            
REJECT     all  --  anywhere             anywhere             reject-with icmp-port-unreachable

Chain LIBVIRT_FWX (1 references)
target     prot opt source               destination         
ACCEPT     all  --  anywhere             anywhere            

Chain LIBVIRT_INP (1 references)
target     prot opt source               destination         
ACCEPT     udp  --  anywhere             anywhere             udp dpt:domain
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:domain
ACCEPT     udp  --  anywhere             anywhere             udp dpt:bootps
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:bootps

Chain LIBVIRT_OUT (1 references)
target     prot opt source               destination         
ACCEPT     udp  --  anywhere             anywhere             udp dpt:domain
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:domain
ACCEPT     udp  --  anywhere             anywhere             udp dpt:bootpc
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:bootpc
Je n'y comprend rien. 
sudo netstat -laputen | grep sshd | grep LISTEN
[sudo] Mot de passe de thierry : 
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      0          92558      12395/sshd: /usr/sb 
tcp6       0      0 :::22                   :::*                    LISTEN      0          92560      12395/sshd: /usr/sb
Là, ça semble OK.

Il y a 10 ans : https://forums.fedora-fr.org/viewtopic.php?id=48849
Bonjour,

c'est le X11Forwarding qui est devenu lent : je n'ai pas encore trouvé pourquoi.

En attendant, désactivez le soit dans ~/.ssh/config , soit avec l'option -x