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I have iptables and masquerading enabled through this:

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

How can I revert this rule? i.e I want to disable the masquerade.

I am afraid to test..because if I fail..there would be a lot of problems (for example lose ssh)

Also can I restart iptables hoping that it wouldn't start rejecting all conns.

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Use -D to delete a rule from the selected chain:

iptables -t nat -D POSTROUTING -o eth0 -j MASQUERADE
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If you delete a rule, that functionality will be gone.

So any SSH sessions that depend on that rule will also disconnect.

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wrong, it will affect new connections only in the case of MASQUERADE, and indeed any other rule you had in the nat table. – Olipro Nov 10 '11 at 23:49
    
@Olipro While we appreciate your efforts, we can't let you dramatically change the meaning of someone's answer like that. You should post that as an Answer yourself. Thank you! – Chris S Nov 26 '12 at 18:11

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