[nos-bbs] ARP

[jerome schatten]

Long ago, someone gave me two arp statements which solved two jnos problems: 1. I couldn’t make jnos talk to my router from the jnos> prompt; and 2. I couldn’t get into jnos via telnet from other machines on my lan. These two statements are embedded now in a shell script that I run prior to executing jnos.

The two statements are:

1. arp -i eth0 -Ds 192.168.0.149 eth0 pub   #jnos side of tun0
2. arp -i eth0 -Ds 192.168.0.107 eth0 pub   #linux side of tun0

In fact, these two addresses are the jnos side of tun0 and the linux side of tun0 respectively. So both sides of tun0 appear in the arp table:

pi at raspberrypi3:~ $ arp
Address                  HWtype  HWaddress           Flags Mask            Iface
192.168.0.1              ether   60:2a:d0:75:0a:9b   C                     wlan0
192.168.0.102            ether   6c:40:08:be:24:80   C                     eth0
192.168.0.120            ether   b8:27:eb:12:28:da   C                     eth0
192.168.0.1              ether   60:2a:d0:75:0a:9b   C                     eth0
192.168.0.149            *       <from_interface>    MP                    eth0
192.168.0.107            *       <from_interface>    MP                    eth0

All this works fine.

Now what I would like to do is to use wlan0 instead of eth0. To this end, I replaced all instances of eth0 with wlan0, and in 2. above, changed the address to reflect the ip address for wlan0, so now have:

3. arp -i wlan0 -Ds 192.168.0.149 wlan0 pub
4. arp -i wlan0 -Ds 192.168.0.130 wlan0 pub

So now I’m stuck — I can’t ping the router from inside jnos and thus there’s no contact into or out of jnos. I can ping both sides of tun0 and the tun module is loaded and ip_forward=1. The arp table now looks like:

pi at raspberrypi3:~ $ arp
Address                  HWtype  HWaddress           Flags Mask            Iface
192.168.0.102            ether   6c:40:08:be:24:80   C                     wlan0
192.168.0.120            ether   b8:27:eb:12:28:da   C                     wlan0
192.168.0.1              ether   60:2a:d0:75:0a:9b   C                     wlan0
192.168.0.149            *       <from_interface>    MP                    wlan0
192.168.0.130            *       <from_interface>    MP                    wlan0

Just for completeness:
.102 is my mac;
.120 is my pi running BPQ
.1   is the router
.149 is the jnos side of tun0 and in the DMZ
.130 is the linux side of tun0

What am I not seeing?
Thanks,
jerome - ve7ass
Vancouver