Ahmad Ali Hazrat, chief of the provincial council in the province, said the attack last night took place in the Dih Bala district in eastern Nangarhar province.
Hazrat said IS fighters attacked Army security posts from three directions and after several hours of heavy fighting, 17 army soldiers were dead.
General Doulat Waziri, spokesman for the Ministry of Defense, said soldiers killed 21 IS fighters.
Also today, an Afghan provincial official said Taliban forces stormed several Afghan security posts in eastern Kunar province, killing five police officers.
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Kalimzai said another police officer is missing after the attack. He said Taliban fighters used heavy machine guns and explosive devices in the assault. Kalimzai added that the Afghan police killed several Taliban fighters.
Afghanistan's eastern Kunar province borders Pakistan.
Insurgency groups have a strong presence in the area.
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