diff --git a/.zshrc2 b/.zshrc2
index 5493eff..d96b54e 100644
--- a/.zshrc2
+++ b/.zshrc2
@@ -108,9 +108,6 @@ esac
 if [[ -x $(command -v trash) ]]; then
     alias "rm"="echo use the full path i.e. '/bin/rm'\; consider using trash"
 fi
-sibd() { ssh -p 12022 root@$1${1:+.}ibd.ink }
-sob() { ssh -p 24022 root@$1${1:+.}ob.ac.cn }
-snasp() { ssh -o ProxyJump="ssh@nasp.ob.ac.cn:36022" dictxiong@$1 }
 gbes() { git for-each-ref --sort=-committerdate refs/heads refs/remotes --format="%(authordate:format:%y-%m-%d.%a %H:%M %z)|%(color:red)%(objectname:short)|%(color:yellow)%(refname:short)%(color:reset)|%(color:reset)%(authorname): %(color:green)%(subject)" --color=always | column -ts"|" | less -FX }
 piv-agent()
 {
diff --git a/scripts/ciot b/scripts/ciot
deleted file mode 100755
index 9902732..0000000
--- a/scripts/ciot
+++ /dev/null
@@ -1,46 +0,0 @@
-#!/bin/bash
-# connect to iot services
-THIS_DIR=$( cd "$( dirname "${BASH_SOURCE[0]:-${(%):-%x}}" )" && pwd )
-source "$THIS_DIR/../tools/common.sh"
-
-# proxy server and port
-SERVER=${SERVER:-bj1.ob.ac.cn}
-get_server_port()
-{
-    local tmp
-    tmp=$(sha256sum <<< "$1" | tr -cd "[:digit:]")
-    tmp=${tmp:0:4}
-    echo $((tmp+36000))
-}
-
-# ssh
-SSH_USERNAME=${SSH_USERNAME:-root}
-_ssh()
-{
-    ssh -p $(get_server_port "$1") "$SSH_USERNAME@$SERVER"
-}
-
-# main
-print_help()
-{
-    fmt_info "usage: $0 <command> <service> [options]"
-    echo "available commands: ssh"
-}
-
-router()
-{
-    case $1 in
-        -h|--help)
-            print_help
-            ;;
-        ssh )
-            _ssh "$2"
-            ;;
-        * )
-            print_help
-            fmt_fatal "unknown command: $1"
-            ;;
-    esac
-}
-
-router "${GOT_OPTS[@]}"
diff --git a/scripts/diot b/scripts/diot
new file mode 100755
index 0000000..e0402ec
--- /dev/null
+++ b/scripts/diot
@@ -0,0 +1,80 @@
+#!/bin/bash
+# connect to iot services
+THIS_DIR=$( cd "$( dirname "${BASH_SOURCE[0]:-${(%):-%x}}" )" && pwd )
+source "$THIS_DIR/../tools/common.sh"
+
+# get target settings
+# provides:
+SERVER=""
+PORT=""
+SSH_USERNAME=""
+SSH_OPTIONS=""
+get_server_meta()
+{
+    local domain=${1##*.}
+    local host=${1%.*}
+    if [[ "$host" == "$domain" ]]; then
+        domain=""
+    fi
+    case $domain in
+        ibd )
+            SERVER=$host.ibd.ink
+            PORT=12022
+            SSH_USERNAME=root
+            ;;
+        ob )
+            SERVER=$host.ob.ac.cn
+            PORT=24022
+            SSH_USERNAME=root
+            ;;
+        nasp )
+            SERVER=$host
+            PORT=22
+            SSH_USERNAME=dictxiong
+            SSH_OPTIONS='-o ProxyJump="ssh@nasp.ob.ac.cn:36022"'
+            ;;
+        "" )
+            SERVER=bj1.ob.ac.cn
+            local tmp=$(sha256sum <<< "$host" | tr -cd "[:digit:]")
+            tmp=${tmp:0:4}
+            PORT=$((tmp+36000))
+            SSH_USERNAME=root
+            ;;
+        * )
+            fmt_fatal "unknown domain: $domain"
+    esac
+}
+
+# ssh
+_ssh()
+{
+    get_server_meta "$1"
+    fmt_note "--> ssh to $SERVER:$PORT"
+    eval ssh -p $PORT $SSH_OPTIONS $SSH_USERNAME@$SERVER
+}
+
+# main
+print_help()
+{
+    fmt_info "usage: $0 <command> <service> [options]"
+    echo "available commands: ssh"
+}
+
+router()
+{
+    test $# -eq 2 || (print_help && fmt_fatal "invalid arguments")
+    case $1 in
+        -h|--help)
+            print_help
+            ;;
+        ssh )
+            _ssh "$2"
+            ;;
+        * )
+            print_help
+            fmt_fatal "unknown command: $1"
+            ;;
+    esac
+}
+
+router "${GOT_OPTS[@]}"
diff --git a/scripts/dogo b/scripts/dogo
index 2c2c6c3..6c8f438 100755
--- a/scripts/dogo
+++ b/scripts/dogo
@@ -25,6 +25,6 @@ fi
 if [[ -z "$CONTAINER" ]]; then
     fmt_fatal "container not found"
 else
-    echo "--> ${CONTAINER_META[@]}"
+    fmt_note "--> ${CONTAINER_META[@]}"
     $SUDO docker exec -it $CONTAINER sh -c 'export DFS="bash <(curl dfs.beardic.cn) -a"; if [ -x "$(command -v zsh)" ]; then echo "--> zsh"; unset DFS; zsh; elif [ -x "$(command -v bash)" ]; then echo "--> bash"; bash; else echo "--> sh"; sh; fi'
 fi
diff --git a/scripts/doll b/scripts/doll
index 2fb7c91..4c18839 100755
--- a/scripts/doll
+++ b/scripts/doll
@@ -20,6 +20,6 @@ fi
 if [[ -z "$IMAGE" ]]; then
     fmt_fatal "image not found"
 else
-    echo "--> ${IMAGE_META[@]}"
+    fmt_note "--> ${IMAGE_META[@]}"
     $SUDO docker run ${2:+"--name"} $2 -itd $IMAGE sh
 fi