Junos OS

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  • 1.  JunOS 22.4.R3.25 won't pass traffic between two GE ports on same VLAN

    Posted 03-29-2024 13:47

    Using the exact same config, I'm testing 22.4R3.25 on an SRX300 -- and traffic between a host on port 0/5 and a host on port 0/1 (simple setup on desk) won't pass traffic between hosts (ping - or anything else) - but when I do nothing but switch JunOS down to 22.4R2.8 -- the traffic passes as expected. 

    I can't find anything on this problem and 22.4R3.25 is new and supposed to fix the nasty CVE on JunOS from last year. 

    Can anyone else confirm this problem? (with maybe a fix?)

    Thanks,

     -Ben



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    Ben Kamen
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  • 2.  RE: JunOS 22.4.R3.25 won't pass traffic between two GE ports on same VLAN

    Posted 04-01-2024 06:06

    I see that 22.4R3-S1 is available for SRX only...

    Maybe give it a try?



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    Olivier Benghozi
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  • 3.  RE: JunOS 22.4.R3.25 won't pass traffic between two GE ports on same VLAN

    Posted 04-04-2024 11:28

    I tried that once upon a time and that was broken too. 

    The point is: 22.4R3.25 is supposed to fix the nasty CVE on JunOS from last year -- and was specifically recommended by JTAC...

    And it seems to be broke. 



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    Ben Kamen
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  • 4.  RE: JunOS 22.4.R3.25 won't pass traffic between two GE ports on same VLAN

    Posted 04-04-2024 16:07

    You should open a JTAC case, then... Maybe something that might be fixed in 22.4R3-S2...



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    Olivier Benghozi
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  • 5.  RE: JunOS 22.4.R3.25 won't pass traffic between two GE ports on same VLAN

    Posted 10-11-2024 12:11

    i think i had same issue as you, my problem was after upgrade from 21.2 to 22.4 version i oculd not use juniper as a jumphost ssh:

    ssh -J 10.122.13.3 192.168.1.105

    was not working from any OS/putty etc etc

    info was :

    channel 0: open failed: administratively prohibited: open failed
    stdio forwarding failed
    kex_exchange_identification: Connection closed by remote host

    from juniper srx messages info was:

    Oct 11 16:31:17  POLORO35-36 sshd[90372]: Accepted publickey for andrzhor from 10.122.16.235 port 7007 ssh2: RSA SHA256:wMg/ASbtYCv1x4YfIWy9k85RfDvVDIjLl7gpVnP9uM5

    Oct 11 16:31:17  POLORO35-36 sshd[90377]: refused local port forward: originator 127.0.0.1 port 65535, target 192.168.1.89 port 22

    after ticket for juniper ( didnt solve it ) support i googled some info about freeBSD issues on that scope. and there was some info that in FreeBSD version 13.3  sshd_conf file getting new settings and one of it is AllowTcpForwarding no

    because of that juniper do not want to passthrou tcp 22 port and killing your session.

    fix for that was to find sshd_conf and change value, in junos its in different place than in regular freeBSD so it is in:

     /var/etc/sshd_conf

    logged to shell as a root and did copy of it just in case and vi original file, in matter of fact there was this option setup as no after upgrade ( no idea what was there in version 21.2 ). Changed it for Yes value, saved it and worked lika a charm, was able to ssh over juniper to other systems behind it. "AllowTcpForwarding Yes"

    Issue is related with upgrade to new FreeBSD version so i think its occuring EVERYONE who upgrade it to this version or similar version ( no idea if version 23 or 24 have this problem or some version before like 22.1 )

    try it maybe it will fix also for you.



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    LUKASZ CZARSKI
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  • 6.  RE: JunOS 22.4.R3.25 won't pass traffic between two GE ports on same VLAN

    Posted 10-11-2024 13:13

    Interesting -- the problem is: it's ALL traffic. Not just SSH. 

    So I don't know how I'd fix all the other traffic types. 

    I'll have to play with it again. 

    I don't have all day to QC/debug JunOS releases. It's really aggravating that Juniper does this. (releases updates without thorough testing - or so it would seem)

    Thanks for the comment though!



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    Ben Kamen
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