The guest system (Ubuntu, Debian, Linux) uses VLAN100 (tagged).
Clients Windows, Mac whatever is untagged.
Each VLAN have their own security zone.
So, when I SSH to a guest system from a client, I get a connection, but when I generate large amount of data eg. dmesg, the SSH session dies, and I have to create a new session; the same is the case if I use telnet. I did a wireshark and get a lost segment just before the SSH/telnet connection dies.
I thought it might be MTU (due to the 802.1Q VLAN tag) and found that when I lower the MTU to 1480 it works; even though the 802.1Q VLAN tag is bigger.
It's just that I've never experienced the MTU on VLAN to be a problem before; I'm quite new on Junos and SRX, I have mostly worked with Cisco and HP and minor vendors, so I'm not sure that the MTU is the actual root cause and not just a work around.
Have anyone experienced this before or have any clues on what it could be?