¿como cerrar puertos en modo invisible ("stealth") en vez de "cerrado"?

Despues de mucho trastear logré entrar en busybox con telnet. ¿Alguien sabe modificar iptables?

telnet 192.168.0.1
Login:admin
Password:OHRG2OHR
sh

iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
DROP tcp -- anywhere anywhere tcp dpt:ftp
DROP tcp -- anywhere anywhere tcp dpt:ftp
ACCEPT udp -- anywhere anywhere udp dpts:50000:50020
ACCEPT udp -- anywhere anywhere udp dpt:6050
ACCEPT udp -- 192.168.0.0/24 anywhere udp dpt:30006
DROP tcp -- anywhere anywhere tcp spt:tproxy
INPUT_SECTELNET tcp -- anywhere anywhere tcp dpt:telnet
ACCEPT udp -- anywhere anywhere udp dpt:snmp
ACCEPT icmp -- anywhere anywhere icmp echo-request
ACCEPT tcp -- anywhere anywhere tcp dpt:www
ACCEPT tcp -- anywhere anywhere tcp dpt:www
INPUT_SECTELNET tcp -- anywhere anywhere tcp dpt:telnet
ACCEPT udp -- anywhere anywhere udp dpt:snmp
ACCEPT icmp -- anywhere anywhere icmp echo-request
ACCEPT tcp -- anywhere anywhere tcp dpt:www
ACCEPT tcp -- anywhere anywhere tcp dpt:www
INPUT_SECDOS all -- anywhere anywhere
ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED
ACCEPT udp -- anywhere anywhere udp dpts:bootps:bootpc
ACCEPT udp -- anywhere anywhere udp dpt:500
ACCEPT esp -- anywhere anywhere
ACCEPT !esp -- anywhere anywhere MARK match 0x10000000/0x10000000
ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED
ACCEPT udp -- anywhere anywhere udp dpts:bootps:bootpc
ACCEPT udp -- anywhere anywhere udp dpt:500
ACCEPT esp -- anywhere anywhere
ACCEPT !esp -- anywhere anywhere MARK match 0x10000000/0x10000000
INPUT_SECTELNET tcp -- anywhere anywhere tcp spt:tproxy
DROP tcp -- anywhere anywhere tcp dpt:135
DROP tcp -- anywhere anywhere tcp dpt:netbios-ns
DROP tcp -- anywhere anywhere tcp dpt:netbios-dgm
DROP tcp -- anywhere anywhere tcp dpt:netbios-ssn
DROP tcp -- anywhere anywhere tcp dpt:445
INPUT_SECTELNET tcp -- anywhere anywhere tcp spt:tproxy
DROP tcp -- anywhere anywhere tcp dpt:135
DROP tcp -- anywhere anywhere tcp dpt:netbios-ns
DROP tcp -- anywhere anywhere tcp dpt:netbios-dgm
DROP tcp -- anywhere anywhere tcp dpt:netbios-ssn
DROP tcp -- anywhere anywhere tcp dpt:445

Chain FORWARD (policy ACCEPT)
target prot opt source destination
INPUT_SECDOS all -- anywhere anywhere
FORWARD_SECFW all -- anywhere anywhere
INPUT_SECURLBLK all -- anywhere anywhere
FORWARD_UTILITY all -- anywhere anywhere
FORWARD_IN all -- anywhere anywhere

Chain OUTPUT (policy ACCEPT)
target prot opt source destination

Chain FORWARD_IN (1 references)
target prot opt source destination
ACCEPT udp -- 192.168.0.0/24 anywhere udp dpt:30006
ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED
ACCEPT !esp -- anywhere anywhere MARK match 0x10000000/0x10000000
ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED
ACCEPT !esp -- anywhere anywhere MARK match 0x10000000/0x10000000

Chain FORWARD_SECFW (1 references)
target prot opt source destination

Chain FORWARD_UTILITY (1 references)
target prot opt source destination
TCPMSS tcp -- anywhere anywhere tcp flags:SYN,RST/SYN TCPMSS set 1412
TCPMSS tcp -- anywhere anywhere tcp flags:SYN,RST/SYN TCPMSS set 1412
TCPMSS tcp -- anywhere anywhere tcp flags:SYN,RST/SYN TCPMSS set 1412
TCPMSS tcp -- anywhere anywhere tcp flags:SYN,RST/SYN TCPMSS set 1412

Chain INPUT_SECDOS (2 references)
target prot opt source destination

Chain INPUT_SECTELNET (4 references)
target prot opt source destination
ACCEPT all -- anywhere anywhere source IP range xxx.xxx.xxx.xxx-xxx.xxx.xxx.xxx
ACCEPT all -- anywhere anywhere source IP range xxx.xxx.xxx.xxx-xxx.xxx.xxx.xxx
ACCEPT all -- xxx.xxx.xxx.xxx anywhere
ACCEPT all -- xxx.xxx.xxx.xxx anywhere
ACCEPT all -- anywhere anywhere source IP range xxx.xxx.xxx.xxx-xxx.xxx.xxx.xxx
ACCEPT all -- xxx.xxx.xxx.xxx anywhere
ACCEPT all -- xxx.xxx.xxx.xxx anywhere
ACCEPT all -- xxx.xxx.xxx.xxx anywhere
DROP all -- anywhere anywhere

Chain INPUT_SECURLBLK (1 references)
target prot opt source destination

Chain INPUT_SECURLBLK_ADVANCE (0 references)
target prot opt source destination