Dig Hangs during axfr request when not on localhost.

[Pete Fry]

Hi

versions:
BIND 9.9.4-RedHat-9.9.4-74.el7_6.1 (Extended Support Version)
CentOS Linux release 7.6.1810 (Core)

We are having a problem on our masters that have large zone files (around
5MB)
are failing to be loaded on our slaves.

after some investigation

we can perform the following commands whilst local on the master

dig @localhost ZONE axfr

and the command performs and exits successfully

however if you fun dig @IP.OF.MASTER ZONE axfr from a machine on the same
subnet
the zone starts to transfer and then hangs at certain points around 150k
bytes give or take and fails to complete.

any idea on what i can look into?

smaller zones are transferring all OK

Thanks for your help
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