让TTL=128

ddr5678

如何让TTL=128啊 改/etc/sysctl.conf加什么啊

Yuri

用iptables啊

huan

发行版中的内核
一般不支持TTL Target
需要自己打补丁
或自己编译安装新内核
iptables并非上策

1. 
   
2. [No.559 22:23:12 ipv4 ]# pwd
   
3. /proc/sys/net/ipv4
   
4. [No.560 22:23:17 ipv4 ]# cat ip_default_ttl
   
5. 64
   

复制代码

jhuangjiahua

直接修改  /proc/sys/net/ipv4/ip_default_ttl  就可以了
echo 128 > /proc/sys/net/ipv4/ip_default_ttl


下面是原先的
hua@hua:ipv4$ ping 127.0.0.1
PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.103 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.095 ms

--- 127.0.0.1 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1000ms
rtt min/avg/max/mdev = 0.095/0.099/0.103/0.004 ms
hua@hua:ipv4$


下面是修改后的
hua@hua:ipv4$ pwd
/proc/sys/net/ipv4
hua@hua:ipv4$ sudo -s
root@hua:ipv4# cat ip_default_ttl
64
root@hua:ipv4# echo 128 > ip_default_ttl
root@hua:ipv4#
root@hua:ipv4# cat ip_default_ttl
128
root@hua:ipv4# ping 127.0.0.1
PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_seq=1 ttl=128 time=0.102 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=128 time=0.093 ms
64 bytes from 127.0.0.1: icmp_seq=3 ttl=128 time=0.088 ms

--- 127.0.0.1 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 0.088/0.094/0.102/0.009 ms
root@hua:ipv4#